CDL AIR BRAKES ENDORSEMENT
CORRECT 100%
To check the slack adjusters on S cam brakes, you should: - ANSWER Wear gloves
and pull hard on each slack adjuster.
To test the low pressure warning signal, you should (3): - ANSWER * Shut the engine
off
* Turn the electrical power on
* Step on and off the brake pedal to reduce air pressure.
With dual air systems, the air pressure should build: - ANSWER From 85 to 100 psi in
45 seconds.
With single air systems, the air pressure should build: - ANSWER From 50 to 90 psi in
3 minutes.
To test air leakage rate you should: - ANSWER Turn off the engine and release the
service brake.
To check the air compressor governor "cut in" and "cut out" pressures (3): - ANSWER *
Run the engine at a fast idle
* Pump the brake to reduce tank pressure
* Monitor the air pressure gauge
The governor allows the air to start pumping again when it reaches the cut in level or
around: - ANSWER 100 psi
Stab braking occurs when you (3): - ANSWER * Press on the brake pedal as hard as
you can
* Release the brakes when the wheels lock up
* Apply the brakes when the wheels start rolling
A fully charged air system typically has how many psi? - ANSWER 125 psi
Compressed air is stored: - ANSWER In the storage tank(s)
The Air Compressor Governor controls: - ANSWER When the air compressor pumps
air into the storage tanks.
Which type of brake is the most common in commercial vehicles? - ANSWER S Cam
brakes
An air tank is equipped with a drain valve to remove: - ANSWER Water and Oil
CORRECT 100%
To check the slack adjusters on S cam brakes, you should: - ANSWER Wear gloves
and pull hard on each slack adjuster.
To test the low pressure warning signal, you should (3): - ANSWER * Shut the engine
off
* Turn the electrical power on
* Step on and off the brake pedal to reduce air pressure.
With dual air systems, the air pressure should build: - ANSWER From 85 to 100 psi in
45 seconds.
With single air systems, the air pressure should build: - ANSWER From 50 to 90 psi in
3 minutes.
To test air leakage rate you should: - ANSWER Turn off the engine and release the
service brake.
To check the air compressor governor "cut in" and "cut out" pressures (3): - ANSWER *
Run the engine at a fast idle
* Pump the brake to reduce tank pressure
* Monitor the air pressure gauge
The governor allows the air to start pumping again when it reaches the cut in level or
around: - ANSWER 100 psi
Stab braking occurs when you (3): - ANSWER * Press on the brake pedal as hard as
you can
* Release the brakes when the wheels lock up
* Apply the brakes when the wheels start rolling
A fully charged air system typically has how many psi? - ANSWER 125 psi
Compressed air is stored: - ANSWER In the storage tank(s)
The Air Compressor Governor controls: - ANSWER When the air compressor pumps
air into the storage tanks.
Which type of brake is the most common in commercial vehicles? - ANSWER S Cam
brakes
An air tank is equipped with a drain valve to remove: - ANSWER Water and Oil
