CDL Flashcards
What factors can cause breaks too fail?
Excessive use of the service breaks. Too much heat from using them.
What are the maximum leakage rates?
3 pounds in 1 min single vehicle
4 pounds in 1 min combination vehicle
How can you check that spring breaks come on automatically?
Stepping on and off the break pedal to reduce tank pressure. Parking break valve should pop out.
How can you check the low pressure warning signal?
Turn the electrical power on and step on and off break pedal to reduce air tank pressure.
How can you check slack adjusters?
Park on level ground and choke the wheels to prevent it from moving. Relese the parking
What are slack adjusters?
Twisting the break cam shaft
What is a dual air break system
2 separate air brake systems which use of a single set of controls.
How do you know if your vehicle is equipped
with anti lock brakes
It has the yellow abs button
Why should you be in proper gear before starting down a hill?
You won’t be able to change gears later.
You should be able to use your lower beams whenever? True or False?
False
Why make an emergency plan when you see a hazard
In order to have time to plan a way out of an emergency.
What is hazard?
Any other road user (driver, pedestrian, bike rider) that is a possible danger.
If you swing wide to the left before turning right another vehicle my try to pas you to the right? True or False
True
What should you do before you drive I you feel drowsy?
Go to sleep for the night or take a 15-20 min nap
You ca safely remove the radiator cap as long as the engine isn’t over heated? True or False?
True
You should let air out of the hot tires that pressure goes back to normal? True or False?
False
What affects can wet breaks cause?
Brakes get weak and apply unevenly
Front wheel breaks are good under all conditions?
TRUE
What are spring breaks?
They are emergency breaks and parking breaks they help when air pressure drops
All vehicles with air brakes must have low air pressure warning signal? True or False?
True
What is a supply pressure gauge used for?
Tells you how much pressure is in the air tanks
Why must air tracks be drained?
The breaks may not work correctly
What must you check before transporting a seal load?
That you don’t exceed gross weight and axle weight limits.
Name 2 basic reasons for cargo on an open bed?
- To protect people from spilled cargo.
2. To protect the cargo from weather.
Minimum number of tie downs for any flat bed load?
2 tie downs
What can happen if you don’t have enough weight in the front axle?
Cause poor traction the drive wheels may spin easily.
Name 2 situations where legal maximum weight may not be safe?
In the mountains or during bad weather?
How often must you stop on the road to check cargo?
After starting within the first 50 miles and after you driven 3 hours or 150 miles.
What are 4 things related to cargo drivers are responsible for?
- Securing the cargo.
- Recognizing over loads.
- Inspecting the cargo
- Making sure the cargo does not block access to emergency equipment.
Why are placcards used for?
To warn others of hazordous materials.
What is a hazard materials placards
A select agent or toxin in 42
Coffee and a little fresh air will help a drinkers sober up? True or False?
False
Common medicines for colds can make you sleepy? True or False?
True
Name 2 causes of tire fires?
Under inflated tires and dual tires that torch
What kind f fires is a B:C extinguisher not good for?
Wood, paper and cloth as well.
When using the extinguisher, should you get as close to the fire? True or false?
False- No stay as far away as possible.
Name some causes of vehicle fires?
Spilled fuel, improper use of flares. Underinflated tires.
What are some things to do at an accident to prevent another one from happening?
- Gets it to the side of the road.
- Put on your flashers
What is an escape ramp?
Ramp made to stop vehicles safely.
You should decrease your following distance if someone is following you too close? True or False?
True
How do you find out how many seconds of following distance space you have?
Leas one second for each 10 feet of vehicle length at speeds below 40 mph
What is black ice?
A thin layer of black ice that is clear enough you can see the road underneath it.
What is hydroplaning?
Its like water skiing the tires lose contact with the road and the vehicle has little or no traction?
Empty trucks have the best braking? True or False?
False
If you go twice as fast your stopping distance will increase by 2 or 4 times?
4 times
3 Things that add up to stopping distance?
- Distance
- Reaction Distance
- Braking distance
How do you recognize distracted drivers?
- Vehicles that drift in and out of lane.
- Pre occupied with maps food and ciggarettes also cell phones.
What things should you check during a pre trip inspections.
- Tire problems
- Wheel rim problems
- bad brakes drums
- Steering system defects
- Emergency equipment
What is the most important reasons for doing a vehicle inspection?
Because it could cause a crash or a breakdown.
If a stopped vehicle on a hill how can you move back with out rolling?
Put the parking break on
2 Special conditions to downshift?
Before starting down a hill and entering a curb.
Key steering system parts
Spindle, pit arm, tie rod, steering shaft and steering knuckle.
What are some tips to follow so you don’t become a distracted driver?
No text or use of the phone pre program the radio.
What is the most important hand signal you and the helper can agree on?
A signal for stopping
When backing why is it important to use a helper?
Because they can help you see the blind spots you can’t see.
Why should you back towards the drivers side?
So you can see better
How do you test the hydraulic brakes for leaks?
Pump the pedal 3 times then hold the pedal firmly for 5 seconds. The pedal should not move if it moves there may be a leak.
How many red reflective triangles should you carry?
3 Triangles
Name some things you should check on the front of your vehicle during the walk around inspection?
Look for leaks look for vehicle leaning to one side.
Minimum tire depth for front tires? and for other tires?
Front tires 4/32 Other tires 2/32
What are suspension system defects?
Cracked or broken spring hangers, missing or broken leaves shock absorbers
3 kinds of emergency equipment you must have?
Fire Extinguisher
Spare electrical fuses
Warning devices- 3 triangles, 3 burning flares.
Where should you place reflectors when on a divided highway?
10- 100- 200 feet away.
2 main things to look for ahead?
Traffic and cautios moves cars people
How far does the manual say you should look ahead?
12-15 seconds
Difference between aggressive drivers and road rage?
Aggressive drivers-The act of operating vehicle in a selfish bold pushy manor.
Road Rage- Operating vehicle with the intent of doing harm to others physically assaulting.
Why should you be in proper gear before starting down a hill?
You may not be able to go into lower gear while going down.
What factors determine your selection of safe speed? When going down a long steep grade?
- Length and steepness of grade
- Road conditions
- Weight of cargo
- Weather
How long does it take for a tractor trailer unit to clear a double track?
15 seconds
What types of vehicles can get stuck on a railroad crossing highway?
Low slung units low boy trailers live stock trailers car carriers single axle tractors.
Describe the proper breaking technique when going down a long steep grade?
- Apply the brakes just enough to feel the slow down
- Speed reduced 5 mph below safe speed release brakes
- Repeat steps 1 & 2 when the speed is safe.
If a tire blows out you should hit the brakes hard to stop? True or False?
False
How do anti-lock breaks help you?
Keeps your wheels from locking up during hard brake applications
Stopping is not always the safes thing to do in an emergency? True or False?
True
What is the proper breaking technique when driving w anti-lock brakes?
Use only the breaking force necessary to stop as you slow down monitor the tractor trailer.
