CDL Class A Air Brakes Practice Questions and Answers

CDL Class A Air Brakes Test
Questions And Correct Answers


All vehicles with air brakes are required to have a low pressure warning signal. This
could be...

A) a red light

B) a wig wag mechanical arm

C) a buzzer

D) any of the above

D




To test the low pressure warning signal, you should do all BUT the following...

A) shut the engine off

B) turn the electrical power on

C) ask a friend to listen for the signal

D) step on and off the brake pedal to reduce air pressure

C




If your truck or bus has dual parking control valves it means that you can use pressure
from a separate tank to:

A) balance the service brake system

, B) release the spring brakes to move a short distance

C) stay parked without using up service air pressure

D) apply more brake pressure if the main tank is getting low

B




When the low pressure warning is activated, you should...

A) wait for the air brakes to come on automatically

B) bring the vehicle to a safe stop while you still control the brakes

C) monitor your air pressure gauge and maintain highway speeds

D) pump the brake pedal hard to stop

B




Your truck or bus has a dual air brake system. If a low air pressure warning comes on for
only one system, what should you do?

A) reduce your speed and drive to the nearest garage for repairs

B) continue at normal speed and find a garbage before the brakes lock

C) reduce your speed and test the remaining system while under way

D) stop. safely park, and continue only after the system is fixed

D




To test your service brakes you should...