AIR BRAKES PRACTICE TEST - MAINE
21.
Most hydraulic brake failures occur for one of two reasons, one of which is:
|
relying too much on the engine braking effect.
|
|
|
excessive downshifting.
|
|
|
loss of hydraulic pressure.
|
22.
If you must drive slowly, how should you alert following drivers?
|
Turn on your taillights
|
|
|
Flash your brake lights
|
|
|
Use your emergency flashers if it is legal
|
23.
The tractor protection valve:
|
will close automatically if the air pressure drops to a certain level.
|
|
|
provides the air supply for the brake system.
|
|
|
All of the above.
|
24.
When the spring brakes are on, you should push the brake pedal down:
|
Only when driving uphill.
|
|
|
Only when driving downhill.
|
|
|
Never.
|
25.
To test the service brake:
|
push the brake pedal firmly while going about 5 mph.
|
|
|
gently try to pull forward with the trailer parking brake on, then release the brake.
|
|
|
shift your transmission to a low gear, pump the brake pedal three times, then hold it down for five seconds.
|
GRADE ME
NOT SURE YOU WILL PASS? GET CDL PREMIUM NOW! - Learn More