27 - CDL Flashcards
What will help you find problems that could cause a crash or breakdown?
Vehicle inspection
What tire tread depth is needed for the front and rear tires?
Front 4/32 Rear 2/32
The steering wheel play cannot be more than what?
10 degrees
At what pressure does the air tank governor kick on to cut-out the buildup of air?
120-140 PSI
What is the normal operating oil pressure?
35-75 PSI
What helps slow a vehicle and reduces the need for using your brakes?
Retarder
When driving at lower speeds how far is 12-15 seconds looking ahead? How far is it at higher speeds?
1 block at lower speeds
A quarter mile at highway speeds
When driving on the open highway how far is 12-15 seconds looking ahead?
0.25 miles
All of the following are good rules for using your turn signal except what?
Signal when ready to move
If you must stop on or by a one-way or divided highway, place warning devices how many feet away from the vehicle?
10 ft, 100 ft, 200 ft
Total stopping distance of a vehicle includes what?
Perception Distance + Reaction Distance + Braking Distance = Total Stopping Distance
The average perception time for an alert driver is what?
1.75 seconds
The average driver has a reaction time of what?
0.75-1.00 seconds
In ideal driving conditions and traveling 55 mph your vehicle will travel a minimun of how many feet for total stopping distance?
419 feet
In ideal conditions at 55 mph on dry pavement with good brakes it can take about how many feet of braking to stop the vehicle?
216 feet
If you double your speed from 20 to 40 mph how many times greater is the impact?
4 times
When the tires lose their contact with the road and have little or no traction it is called what?
Hydroplaning
What is not a type of distraction?
Weather distraction
Research shows that the odds of being involved in a safety-critical event like a crash or near-crash is how many times greater for drivers who engage in dialing a mobile telephone?
6 times
What is aggressive driving in the act of operating a motor vehicle in a selfish, bold, or pushy manner is called what?
Aggressive driving
Which brake system applies and releases the brakes when you use the brake pedal during normal driving?
Service
The governor controls when the air compressor will pump air into the air storage tanks. At around what psi will the air compressor governor “cut-out”, or stop pumping air into the system?
125
A safety relief valve is installed in the first tank the air compressor pumps air to. The safety valve protects the tank and the rest of the system from too much pressure. At what psi is the valve usually set to open?
150
Compressed air usually has some water and some compressor oil in it, which is bad for the air brake system, and tends to collect in the bottom of the air tanks. For example, the water can freeze in cold weather and cause brake failure. Unless the system has automatic drain valves, how often should air tank systems be drained?
Daily
On newer vehicles with air brakes, what mechanism do you use to put on the parking brakes?
Diamond-shaped, yellow, push-pull control knob
When does the Antilock Braking Systems (ABS) activate?
ABS only activates when wheels are about to lock up
During a walk-around inspection when checking the slack adjusters on S-cam Brakes, an adjustment is needed if a slack adjuster moves more than how many inch(es) where the push rod attaches to it?
1
Whilst fully applying the foot brake for one minute when testing the air leakage rate, if the air pressure drops more than how many pounds in one minute (single vehicle) or how many pounds in one minute (combination vehicle), is the air loss rate too much?
3, 4
When the engine is at operating rpms, within how many seconds should the pressure build from 85 to 100 psi?
45
In air brakes systems, what is referred to as the time required for the brakes to work after the brake pedal is pushed?
Brake lag
Air pressure should build from 50 to 90 psi within how many minutes?
3
When testing hydraulic breaks for a leak, you should pump the brake pedal how many times before applying firm pressure and holding for how many seconds?
3, 5
The distance your vehicle will travel, in ideal conditions, while you are braking is called?
Braking distance
The distance you will continue to travel, in ideal conditions, before you physically hit the brakes is referred to as?
Reaction distance
The distance your vehicle travels, in ideal conditions, from the time your eyes see a hazard until your brain recognizes it is called?
Perception distance
Hydroplaning can occur at speeds as low as?
30
A low air pressure warning signal is required on vehicles with air brakes. A warning signal you can see must come on before the air pressure in the tanks drops below what psi?
60
Tractor and straight truck spring brakes will come fully on when air pressure drops to a range between how much psi?
20-45
When testing the air leakage rate with a fully charged system(125 psi), turn off the engine, release the parking brake, and time the pressure drop. In one minute what should the loss rate be less than (psi) for single vehicles and combination vehicles?
2, 3
Total stopping distance for vehicles with air brake systems is made up of which sequence of factors?
Perception, reaction, brake lag, and braking
In a braking system what is the S cam used for?
to apply the brakes
The brake systems that applies and releases the brakes when the driver uses the brake pedal is?
service brake system
Anti-lock braking system does which of the following?
activates when your wheels are about to lock up
The air compressor will stop putting air into the tanks at what PSI?
125
Excessive heat caused by overuse of the service brakes can cause what?
brake fade
During normal driving brakes are held back by?
air pressure
What is the minimum tread depth for rear tires?
2/32’’
The air compressor governor controls?
when the air is pumped into the air tanks
What is the minimum tread depth for front steer tires?
4/32’’
The driver must be able to see a warning that is given before air pressure in the service air tanks falls below?
60 psi
The most common type of foundation brakes found on heavy vehicles is the?
‘S’’ cam
In the event of a brake system failure, the emergency brake system uses what to stop the vehicle?
parts of the service brakes and parking brake
Repeatedly pressing and releasing (fanning) the brake pedal may result in?
a loss in brake air pressure
You should know that your brakes are fading when?
you must push harder on the brake pedal to control your speed downhill
If their were to be an emergency air loss in the braking system at what PSI would the parking brake activate?
30-40 psi
You must have a CDL to drive a vehicle over what weight?
26,001 lbs.
Steering wheel play more than degree needs to be addressed or taken out of service?
10 degrees
How many leaf springs need to be missing to remove the vehicle form service?
4-Jan
Most good drivers are constantly looking how far ahead?
12-15 seconds
Which of the following is not part of the total stopping distance?
brake pedal distance
How many kinds of CDL endorsements are there?
6
The Passengers (P) endorsement is for drivers who wish to drive a vehicle having a design capacity to carry how many people?
16
How many miles per hour over the posted speed limit is considered “excessive speeding?”
15
What is the most important reason you inspect your vehilce?
Safety
If you do not wear your seatbelt, you are how many times more likely to be fatally injured if you are thrown from the vehicle?
4
Rust around the wheel nuts may be an indicator of what?
Loose nuts
Air pressure should build from 50-90 psi within how many minutes?
3
What is the formula for stopping distance?
Perception Distance + Reaction Distance + Braking Distance
What is more likely to cause hydroplaning?
Low tire pressure
At speed below 40 mph, how much space should you keep in front of you?
One second for each 10’ of vehicle
What is the general air tank “cut-out” level?
Around 125 psi
What is the general air tank “cut-in” level?
Around 100 psi
When determining the air leakage rate, what should the loss rate be on single vehicles?
2 psi for one minute
When the engine is at operating RPMS, the pressure should build from 85 psi to 100 psi within what amount of time?
45 seconds
What is the time required for the brakes to work after the brake pedal is pushed?
Brake lag
Regarding rims during the vehicle inspection, what can they NOT have?
Welding repairs
What is the definition of “aggressive driving?”
The act of operating a motor vehicle in a selfish, bold, or pushy manner, without regard for the rights or safety of others
How low of a speed can hydroplaning occur?
30 MPH
What must you use as the prinicpal way of controlling your speed on downgrades?
Braking effect of the engine
Regarding air brakes, when pushing down the brake pedal, what is the name of the valve you are pushing?
Treadle valve
What the number 1 reason to inspect your vehicle?
Safety
What can you do during your drive to help with safety of your vehicle?
watch gauges
What does rust around your wheel nuts mean?
they are loose
How much play in the steering wheel (in degrees)?
10
How many leaf spring missing will mean out of service?
one-fourth
How many steps in an inspection, according to CDL manual?
7
What helps you slow a vehicle down and reduces the need for using your brakes?
retarders
How far ahead should you look in the city?
1 block
How far ahead should you look on an open road?
quarter-mile
What are 3 good rules for turn signals?
Signal early,signal continuously and cancel your signal
What distance do you place warning devices on a one-way or divided highway?
10ft,100ft,200ft
What distance do you place warning devices on a curve or hill?
10ft , 100-500ft
What is total stopping distance?
Perception + reaction + braking
What is the avg, preception time of an alert driver?
1 3/4 seconds
what is the avg reaction time of an alert driver?
3/4-1 second
How far will your vehicle travel minimally at 55mph?
419ft
What is it called when tires have little or no traction on wet pavement?
Hydroplanning
How low of speed can you hydroplanning occur?
30 mph
How much space do you need at 40 mph?
1 second for each foot of your vehicle length
which lane to turn left if there is 2 left turning lanes?
right lane
What is the minimum tread depth in every major groove on the front tires?
4/32-inch
What is the minimum tread depth in every major groove on all tires besides the front tires?
2/32-inch
How many missing leaf springs will put a vehicle out of service, according to the VA CDL Manual?
One Fourth
Air pressure should build from 50 to 90 psi within how many minutes?
3 Minutes
The average driver has a reaction time of how many seconds?
3/4-1 Second
Which of the following does not contribute to total stopping distance?
Processing Distance
A low air pressure warning signal is required on vehicles with air brakes, this alarm must come on when the tanks fall below how many psi?
60 psi
Spring brakes come fully on when the air pressure drops to a range of what?
20-45 psi
Before driving away, the driver must allow the air compressor to build up a minimum of how many psi?
100 psi
At the end of every day, the drive should do what to ensure there is no water or oil in the air tanks?
Drain them with a quarter turn valve or by pulling a cable
When checking the brakes, a driver should park on level ground, chock the wheels, release the parking brake, and pull hard on each slack adjuster. If it moves more than how many inches, it probably needs to be adjusted?
1”
When checking brake drums, cracks longer than what will require replacement?
Half the width of the friction area
In order to check the air compressor cut-in and cut-out, once the air pressure meets its manufacturer’s specifications what is the next step?
Step on and off the brake to reduce the air tank pressure
When testing the air leakage rate, after turning off the engine and releasing the parking brake, what is an acceptable loss rate?
Less than two psi in one minute
When testing the air leakage rate, after releasing the parking brake and applying the foot brake for one minute, what is an acceptable air pressure drop?
Less than three psi in one minute
When the engine is at operating rpms, it should build air pressure from 85-100 in how many seconds?
45 seconds
When checking the spring brakes, the driver should continue to fan off the air pressure until the tanks fall below the manufactuer’s specification until what happens?
The spring brakes come on
What is the time required for the brakes to work after the brake pedal is pushed called?
Brake Lag
What happens as a result of excessive heat causing chemical changes in the brake lining, which reduce friction?
Brake Fade
Why should parking brakes be used with caution when the weather is wet and freezing?
The brakes could freeze
What is the gross vehicle weight rating that requires to have a cdl to operate?
26,001 pounds or more
All of the following are types of retarders except:
Air
When the temperature is close to how many degrees the bridges will freeze?
32°
How much space should you keep in front of you if you are driving a 40 foot vehicle?
4 seconds
What is the distance a vehicle needs to be for a driver be able to use the high beams?
500 feet
What is the minimum air pressure neede for a primary and secondary air brake system before driving?
100psi
What are the maximum leakage rates?
More than 3psi/ per min. for single vehicle or 4 psi/per min. for a combination vehicle
Apply your brakes all the way,release brakes when wheels lock up and apply brakes fully again when wheels start rolling. What is this method called?
Stab braking
What is the term used for the time required for the brakes to work after the brake pedal is pushed?
Brake lag
All of the following are things you can do to reduce the chance of a crash when tailgated except:
Make quick changes
Engaging in a conversation with a passenger is an example of what type of distraction?
Mental distraction
When is it ok to safely open the cap and add coolant even when engine is at operating temperature?
If the container is not part of the pressurized system
How must every railroad-highway crossing be aproached?
With expectation that a train is coming
What are the two types of railroad crossings?
Passive and Active
When the road crosses over more than one track, what does the sign below the cross-buck indicate?
Number of tracks
What do double tracks require?
A double check
When inspecting the engine compartment belts, what is the minimum play he belt should have?
1/2 inch
What is the minimum tread depth on tires?
4/32 front and 2/32 back
When backing, what is the most important hand signal you and the helper should agree on?
STOP
How far ahead should a driver look?
At least 12 to 15 secs.
What is the equation used to determine stopping distance?
perception distance+ reaction distance+braking distanc+brake lag distance=total stopping distance
The average perception distance time for an alert driver is 13/4 seconds. A vehicle traveling 55mph that accounts for:
142 feet
At 55 mph, the average reaction distance for an alert driver in ideal conditions is:
61 feet
Braking distance is defined by the VDOT CDL manual as:
the distance the vehicle will travel while braking in ideal conditions
While traveling 55 mph, the minimal total stopping distance of a vehicle is:
450 feet
A vehicle traveling 55 mph will have an average braking distance of:
216 feet
When you double your speed you:
increase your total braking distance by 4 times
On slippery surfaces or wet roads, it is recommended that a driver reduces their speed by:
one-third
Hydroplaning can occur at speeds as low as:
30 mph
hydroplaning is more likely if:
the tire pressure low and the tread is worn
Trucks are more likely to encounter a rollover if:
they have a high center of gravity
When is the braking effect of the engine the greatest?
when the motor is near its governed rpms and the transmission is in the lower gears
How much space should be between a vehicle and a piece of apparatus that is 40 feet in length traveling above 40 mph?
5 seconds
Low beams can be used to see roughly:
250 feet Infront of you
High beams can be used to see roughly:
350-500 feet Infront of you
Be sure to turn off high beam headlights within:
500 feet of an approaching vehicle
While testing the service brake in a combination vehicle with the vehicle turned off, the driver operator should hold down the brake pedal for one minute and assess the air pressure gauge to ensure:
that the system does not lose more than 4 psi
Belts located in the engine compartment should have no more than:
1/2 -3/4 inch of play
To asses the service brake operability, drivers should remove the parking brake and pull forward to:
5 mph, apply brakes and assess braking capability
What is the average distance for brake lag while driving at 55 mph?
32 feet
What is the primary reason why you inspect a vehicle?
Safety
What is the minimal tread depth required on front tires of trucks and other heavy apparatus?
4/32 inch
What is the minimal tread depth required on all tires on an apparatus with the exception of the front set?
2/32 inch
How many leaf springs can be missing before a unit can be placed out of service per the VDOT CDL manual?
a quarter
What is the first step in the vehicle inspection process per the VDOT CDL manual?
review last vehicle inspection report
At what pressure does the governor “cut-out” activate?
120-140 psi
Air pressure should build from 50 to 90 psi within:
3 minutes
The normal idling oil pressure in trucks and other diesel engines is:
5-20 psi
The normal oil operating pressure in apparatus containing a diesel motor is:
35-75 psi
If the engine oil pressure indicator begins to drop rapidly or read low, operators should:
stop the engine immediately
To preform a check on the functionality of the service brake, driver/operators should:
proceed to 5 mph and push the brake pedal firmly
What is the device used to monitor a diesel engines RPM?
tachometer
When going down grades and using an engine brake, vehicles with automatic transmissions should:
select a low range to prevent the vehicle from shifting up beyond the selected gear
What are the basic types of engine retarders?
exhaust, engine, hydraulic, electric
How far ahead should drivers should be looking for road hazards?
12-15 seconds
Good drivers will assess for road hazards 12-15 seconds ahead of their vehicle or:
1 block at low speeds or 1/4 mile at highway speeds
Many large vehicles will have a curved mirror that show a wider area than flat mirrors. What are they called?
convex mirrors
What is “perception distance”?
the distance your vehicle travels from the time your eyes see a hazard until your brain recognizes it
What is the average “perception time” for an alert driver?
1 3/4 seconds
What is the average reaction time to physically apply the brakes?
3/4- 1 second
CDL is an acronym for what?
Commercial Driver’s License
When checking engine belts, what are the parameters allowed for play at center of belts?
1/2”-3/4”
Air pressure governor cut-out should occur between what psi?
120-140
Is it acceptable to check brake and turn signal lights at once while enabling the 4-way flashers?
no, must be checked individually
When checking apparatus lights, which of the following is not included?
hand lights
Vehicle reflectors require red in what locations?
rear
What type of check requires the operator to pull forward at 5mph and stop to determine if vehicle pulls to one side?
service brake
A low air pressure warning should occur before the pressure drops below what psi?
65
Minimum tread depth for tires is?
2/32” on tires not including steering tires
In regards to basic vehicle control, encroachment is defined as?
touching or crossing over and exercise boundary
Rust around wheel nuts may indicate what?
loose nuts
The CDL manual suggests starting with what step when inspecting apparatus?
vehicle overview/last inspection report
What is the worst possible effect from an exhaust system defect for personnel inside the cab?
poisonous fumes entering cab
When starting the vehicle the anti-lock braking system light should?
turn on then off
If on start-up the engine oil gauge is fluctuating, this indicates?
stop engine and ensure oil level
A good rule of thumb for walk around inspection starts and proceeds where?
drivers door/clockwise
What type of brakes require a low pressure warning signal?
air brakes
A good habit to follow when the spring brake is applied is to?
not press the brake pedal down at the same time
When air pressure is lost in dual parking control valves, what is the result?
spring brake engages
Before driving a vehicle with dual air system, the compressor should build up to what minimum psi?
100
What is the least amount of tread depth on the front tires?
4 /32
What is the least amount of tread depth on all the other tires except the front tires?
2 /32
Steering wheel play should be no more than how many degrees?
10 degrees
Steering wheel play should be no more than how many inches on a 20 inch steering wheel?
2 inches
How many leaf springs have to be missing before a vehicle can be put out of service?
1/4
What emergency equipment must all vehicles carry?
Fire extinguisher(s), Spare electrical fuses, and warning devices for parked vehicles
How long should it take for air pressure to build up from 50 psi to 90 psi?
3 minutes
When does the air pressure to governor usually cut out?
120 to 140 psi
When testing the brake system and conducting a service brake stopping action test, how many miles per hour should you be driving?
5 mph
Why is it recommended to drain air tanks?
Water and/or oil gets in the tanks, which can freeze in cold weather
A low air pressure warning signal is required on vehicles with air brakes. A warning signal you can see must come on before the air pressure in the tanks falls below how much psi?
60 psi
Tractor and straight truck spring brakes will come fully on when air pressure drops to what range?
20 to 30 psi
When conducting vehicle inspection tests, the power steering belt, water pump belt, alternator belt, and air compressor belt should all have how much play?
1/2 to 3/4 inch play at center of belt
When conducting the hydraulic brake test, how many times should you pump the brake pedal down below you hold it down for 5 seconds?
3 times
When were ABS brakes required to be on trucks, buses, trailer, and converter dollies?
If they were built on or after March 1, 1998
Aside from three red reflective triangles and 6 fuses, what else can be substituted for this emergency equipment?
3 liquid burning flares
For manual slack adjustors, the brake pushrod should not move more than how far with the brake released when pulled by hand?
1 inch
When checking the seat belt, what are some things to check for during the vehicle inspection test?
That it is securely mounted, adjusts, latches properly and is not ripped or frayed
What is the term during the basic vehicle skills test which is used to discribe when a driver stops and pulls forward to clear an encroachment or to get a better position?
A pull-up
During the on-road driving test, if your test route does not have certain traffic situations which are required for the exam, what may be asked of you?
To simulate a traffic situation by telling the examiner what you are or would be doing if you were in that traffic situation.
The inspection that is done at the end of a trip, day, or tour of duty is known as what?
After-trip inspection
What does rust around wheel nuts generally indicate?
The wheel nuts are loose
The minimum emergency warning equipment vehicles are required to carry for when parked include what?
Three reflective triangles, or at least six fusees or three liquid burning flares
How long should it take a vehicle to build air pressure from 50 to 90 PSI?
Within 3 minutes
If a vehicle has hydraulic brakes, you should pump the break pedal how many times, and then press and hold the pedal with firm pressure for how long?
Three times, five seconds
What speed should be reached when testing the service brake?
5 MPH
Which of the following is not a component of the air brake system?
Engine brake
What system applies and releases the brakes when you use the brake pedal?
Service brake
What system applies and releases the parking brake when you use the parking brake control?
Parking brake
What system uses parts of the service and parking brake systems to stop the vehicle in a brake system failure?
Emergency brake
How often should the air tanks be manually drained?
Daily
The safety valve of an air tank is usually set to what pressure?
150 PSI
Which of the following is not one of the types of foundation brake systems?
Rotary brakes
Before driving a vehicle with a dual air brake system, you should allow time for the air compressor to build up to what pressure at a minimum?
100 PSI
Belts within the engine compartment should have how much play in them?
1/2” - 3/4”
The brake pushrod on a manual slack adjustor should not move more than how far when pulled by hand?
1”
What is the proper way to exit the vehicle?
Maintain three points of contact facing the vehicle
When moving back into traffic from the right shoulder, when should you cancel your turn signal?
Once the vehicle is back into the flow of traffic
What step should be done to prevent over or under-steering?
Keep both hands on the wheel at all times
Which tires are required to have 4/32” of tread depth on them?
Front tires
What is the minimum tread depth needed in every major groove on the front tires?
4/32 inch
What is the minimum tread depth needed on all other tires?
2/32 inch
Steering wheel play of more than what degree can make it hard to steer?
10 degrees
How many missing leaf springs will put the vehicle out of service?
One fourth
Air pressure should build from 50 to 90 psi in what time frame?
3 minutes
What is a normal operating range for oil pressure?
35-75 psi
When turned on, retarders only apply their braking power to what wheels?
Drive wheels
What conditions should you turn the retarder off?
All of the above
When driving how far ahead should you look?
12-15 seconds
What makes up total stopping distance?
All of the above
What is perception distance?
The distance you vehicle travles, in ideal conditions; from the time your eyes see a hazard until your brain recognizes it
When on a wet road, you should reduce your speed by how much?
One third
On packed snow, you should reduce your speed by how much?
Half or more
Hydroplaning can occur at speeds as low as what?
30 mph
For vehicle spacing, a good rule says you need a at least how much time for every 10 feet?
1 second
With low beams you can see ahead about how many feet?
250 feet
What causes most front wheel skids?
Driving too fast
What is the air tank “cut-out” pressure?
125 psi
When is the safety relief valve set to open?
150 psi
Belts in the engine compartment should have how much play?
.5 to .75 inches
You need at least how much tread depth on front tires?
4 over 32
You should do an after-trip inspection at all of the following times except what?
End of any repairs made
What is the most important reason you inspect your vehicle?
Safety
What laws require that drivers inspect their vehicles?
Federal and state
Vehicles must be equipped with emergency equipment. Warning devices for parked vehicles is how many reflective triangles?
3
Oil pressure at idle should be what?
5–20
Oil pressure while operating should be what?
35–75
What is the cutoff level for air storage tanks?
125
What helps to reduce the risk of ice in air brake valves?
Alcohol Evaporator
The safety valve for the btake system is usually set to open at what pressure?
150
The low air pressure warning must come on before the tanks fall below what pressure?
60
When checking the engine compartment belts for snugness you are looking for how much play at the center of the belt?
1/2 to 3/4
Check the air guage to see if the air pressure drops more than how many pounds in one minute for single vehicles?
3
When fanning off the air pressure at what pressure should you see the parking brake valve close?
40
When checking the service brake how fast should you pull forward?
5 MPH
Unless shuffling how many hands should be on the steering wheel at all times?
2
Where do you stop the vehicle at stop signs?
Behind
You should check mirrors and traffic at all of the following times except what?
In congested areas
A broken exhaust system can do what?
Let poison fumes into the cab
How many steps is the inspection method?
7
What are the three types of braking systems?
Service brake, parking brake and emergency brake
When does the air compressor governor allows compressor to start pumping again?
Around 100 psi
If the safety valve releases air, what is happening in the system?
Something is wrong
How can a driver tell if the vehicle has an ABS malfunction?
Yellow lamp on
What type of device is the yellow triangle in the trucks?
Spring brake
Before driving a vehicle with dual air system, what is the minimum pressure the system should have?
100 psi
What is the most common problem found in roadside inspections?
Ouf-of-adjustment brakes
When the engine is working properly and there is a dual air system, what pressure and how long should build up?
85 to 100 psi within 45 seconds
Applying the brakes as hard as you can and keeping the steering to a minimum is what type of braking?
Controlled braking
All of the following are factors of the total stopping distance except:
Momentum distance
What is the allowed play that an engine belt can have?
1/2 to 3/4 inch
What emergency equipment should a vehicle have ?
Three red reflective triangles
On a combination vehicle, the air pressure should not drop how many psi when brake is applied for one minute?
More than 4 pounds
What happens to the parking brake valve when the pressure is at approximately 40 psi?
Should close
What part when pulled, should not move more than one inch?
Manual slack adjustors
What CDL class would a driver be applying for if it is required to perform one of four versions of the vehicle inspection for testing?
Class A
What is the safe gap if stopping behind another vehicle?
When driver can see the rear tires on vehicle ahead
Which maneuver will the driver be asked to pull over to the side and stop as if the driver were going to get out and check something?
Stop/start
At what distance should the vehicle be stopped from the nearest rail?
Within 50’ but no less than 15’
What should the driver do when approaching a railroad crossing?
Activate four-way flashers
What is the minimum tread depth in every major groove on front tires?
4/32”
What is the minimum tread depth in every major groove on rear tires?
2/32”
What is the maximum acceptable amount of steering wheel play?
10 degrees
Approximatley how many inches of movement is acceptable on a 20-inch steering wheel?
2 inches
How many missing or broken leaves in any leaf spring will put the vehicle “out of service”?
One-fourth
The air pressure governor cut-out is usually between what PSI?
120-140
Normal idling oil pressure is typically between what PSI?
5-20 PSI
Normal operating oil presure is typically betwee what PSI?
35-75 PSI
What are the three components that make up air braking systems?
Service brake, parking brake, emergency brake
What is the typical “cut-in” pressure for the air compressor governor?
100 PSI
At what PSI is the safety relief valve in the air brake system set to open?
150
A warning signal you can see must come on before the air pressure inthe tanks fall below?
60 PSI
Antilock Braking Systems are computerized systems that do what during hard braking?
Help you keep the vehicle under control
When should you check the engine oil level?
When engine is off
During hydraulic brake checks, pump the brake pedal how many times, then hold it down for five seconds to ensure the brake pedal does not move?
3 times
At approximately what PSI should the parking brake pop out during an air brake check?
40 PSI
What can be an indication that the rim is loose on a wheel?
Rust trail
Which of the following is not a component of an air braking system?
Antilock brakes
When checking the rims, what cannot be present in order to be deemed safe?
Welding repairs
What should the driver/operator do if oil pressure is low, dropping or fluctuating while driving?
Stop immediately
FInding a vehicle defect during an inspection could?
Save you problems later
What critical items should be checked when stopped?
Tires, wheels, rims, brakes. lights/reflectors
How much tread depth should there be in every major groove on front tires?
4/32”
How much tread depth should there be in every major groove on tires other than the front?
2/32”
Steering wheel play more than how many degrees can make it hard to steer and be repaired?
10 degrees
What should operating oil pressure be between?
35-75 psi
At what point does the low air pressure warning signal light or buzzer come on?
60 psi
ABS assists in braking by:
Keeping vehicle under control during hard braking
Why should the air tanks be drained after each day of driving?
To reduce the amount of water and compressor oil in it system
How many components make up the air brakes?
Three: service brake, parking brake and emergency brake
How does everything appear in a convex mirror?
Smaller
How should a driver signal?
Early and continuously
How should the engine oil level be checked?
With the engine off
When should the air compressor cut off?
When it builds to 120-140 pis
At what psi should the parking brake actuate?
40psi
What speed should the service brake be checked?
5mph
How many/much of a leaf spring missing places the unit out of service?
1/4th or more
A vehicle inspection should be conducted how?
The same way each time
At a stop sign, crosswalk or stop line, the vehicle should:
Come to a complete stop
What should be checked and known prior to going under and overpass or bridge?
Height of vehicle and clearance of overpass
On a CDL vehicle what is the S cam used for?
to apply the brakes
The brake systems that applies and releases the brakes when the driver uses the brake pedal is?
service brake system
Anti-lock braking system does which of the following?
activates when your wheels are about to lock up
The air compressor will stop putting air into the tanks at what PSI?
125
Excessive heat caused by overuse of the service brakes can cause what?
brake fade
During normal driving brakes are held back by?
air pressure
What is the minimum tread depth for rear tires?
2/32’’
The air compressor governor controls?
when the air is pumped into the air tanks
What is the minimum tread depth for front steer tires?
4/32’’
The driver must be able to see a warning that is given before air pressure in the service air tanks falls below?
60 psi
The most common type of foundation brakes found on heavy vehicles is the?
‘S’’ cam
In the event of a brake system failure, the emergency brake system uses what to stop the vehicle?
parts of the service brakes and parking brake
Repeatedly pressing and releasing (fanning) the brake pedal may result in?
a loss in brake air pressure
You should know that your brakes are fading when?
you must push harder on the brake pedal to control your speed downhill
If their were to be an emergency air loss in the braking system at what PSI would the parking brake activate?
30-40 psi
You must have a CDL to drive a vehicle over what weight?
26,001 lbs.
Steering wheel play more than degree needs to be addressed or taken out of service?
10 degrees
How many leaf springs need to be missing to remove the vehicle form service?
4-Jan
Most good drivers are constantly looking how far ahead?
12-15 seconds
Which of the following is not part of the total stopping distance?
brake pedal distance
