Combination Vehicle Flashcards
Bob tailing means:
No trailer attached
The ONLY time you should use the hand valve (brake) is to
Test E- brakes
Glad hands are hooked together or to dummy couplers to…
Avoid water & dirt out of airlines
ABS is an addition to your normal breaks. There purpose is to help…
Avoid wheel lock up
If you cross air lines on old trailer W/O SPRING BRAKES. You WILL NOT have use of trailer brakes TRUE or FALSE?
True
If Damage or breakage to Emergency or service air lines occurs. What will happen?
- Tractor Protection Valve will close
- Trailer brakes will engage
5th wheel must be greased to prevent …
Steering issues
The trailer brakes MUST ALWAYS be _______ & ______ before backing under it to couple.
Chocked & locked
When coupling & un-coupling ALWAYS use these for safety!
Chock blocks
You know the trailer is at the correct height when backing under it because .
It’s raised slightly to relieve pressure off landing gear
Before backing under the trailer.l you must set the ______ brakes
TRAILER brakes.
Gently pull on the kingpin when the ____brakes are locked
Trailer
Trailer brakes must be connected BEFORE or AFTER backing under the trailer?
Before
If pulling more than 1 trailer ALL AIR VALVES are OPEN…. EXCEPT which trailer
Last trailer. Crack this valve to test air system.
Always check the kingpin visually true or false.
True
Tractor bob-tail takes longer to stop than a loaded combination vehicle T or F..
True
5th wheel locking jaws or safety latch must be over the locking lever. True or false
True
Trailer support OR dollies should always be raised FULLY & _____ should be secured before moving.
Crank handle
There must be adequate clearance between the _____ & the ______.
Tractor tired & nose of trailer
3 parts of the kingpin:
Head
Shank
Base
Which part of the kingpin should the locking jaws go around
Shank
One rule is important with all skids
restore traction
If the emergency air line breaks while driving the loss of pressure will cause this action.
Emergency brakes trailer brakes to come on
If lines are crossed the trailer brakes would ..
Not work!
Trailers made before 75’ don’t have these kind of brakes
Spring brakes
As you slow down you should
- Monitor your tractor & trailer
- Back off the brakes
True or false
True
If you have a major leak in the SERVICE AIR LINE & put on the brakes the EMERGENCY brakes, will engage TREU or FALSE ?
TRUE
After you supply air to the trailer you that the lines are Not crossed by:
Also lying & releasing trailer brakes & listening for Audible leaks.
You supply air to the air tank on the TRAILER by?
Pushing the RED trailer supply valve (TSV)
Safety catch for the 5th wheel locking lever MUST BE over the locking lever
True or False
Relay valve allows the device brake to be applied more quickly TRUE OR FALSE
True
When trailer support (landing gear) is up & trailer is resting on the tractor make sure:
- There’s enough clearance between tractor tired & nose of the trailer.
- Tractor frame & the landing gear.
You pushed the trailer air supply valve. DO NOT move the tractor until the psi is at____
100-125 psi
TRACTOR PROTECTION VALVE is an in can valve that keeps air supply to the tractor should the TRAILER brake away or leak. TRUE or FALSE
True
What kind of trailer is most likely to hang up on railroads.
Low-boy trailer
Yellow test light in the cab indicates:
Trailer has ABS
