CDL - AIR BRAKES PRACTICE TEST
CORRECT 100%
Which of the following is true about your brake function if your ABS fails?
1. you will still have normal brake function, but you will need to get the ABS repaired
soon
2. you will have no brake function and the truck will be out of control
3. it will slow your truck to a halt and force you to pull over
4. it may cause problems with other mechanical systems, and there could be a huge fire
risk - ANSWER you will still have normal brake function, but you will need to get the
ABS repaired soon
Which of the following does ABS do?
1. increases your normal braking capability
2. decreases your normal braking capability
3. activates when the wheels are about to lock up
4. shortens your stopping distance - ANSWER activates when the wheels are about to
lock up
The tractor protection valve....
1. will close itself automatically if the air supply drops to a certain level
2. provides your air supply for brake system
3. is closed by the parking brakes
4. all the above - ANSWER all the above
Which of the following factors can cause brakes to fail or fade?
1. brakes being out of adjustment
2. excessive use of the service brakes
3. not relying enough on engine braking
4. all the above - ANSWER all the above
What is the best way to test your vehicle's low air pressure warning signal?
1. step on and off the brake pedal with the engine off to reduce air pressure below 60
psi
2. pump the brakes while your vehicle is fully on
3. manually let the air out of your brakes and see if the signal comes on
4. pump the brakes until the air pressure drops below 30 psi - ANSWER Step on and
off the brake pedal with the engine off to reduce air pressure below 60 psi
The purpose of a supply pressure gauge is :
1. to tell you how hot the air in the tank is
2. to warn you only if there is too little air in the tank
3. to tell you how much air is in the tank - ANSWER to tell you how much air is in the
tank
CORRECT 100%
Which of the following is true about your brake function if your ABS fails?
1. you will still have normal brake function, but you will need to get the ABS repaired
soon
2. you will have no brake function and the truck will be out of control
3. it will slow your truck to a halt and force you to pull over
4. it may cause problems with other mechanical systems, and there could be a huge fire
risk - ANSWER you will still have normal brake function, but you will need to get the
ABS repaired soon
Which of the following does ABS do?
1. increases your normal braking capability
2. decreases your normal braking capability
3. activates when the wheels are about to lock up
4. shortens your stopping distance - ANSWER activates when the wheels are about to
lock up
The tractor protection valve....
1. will close itself automatically if the air supply drops to a certain level
2. provides your air supply for brake system
3. is closed by the parking brakes
4. all the above - ANSWER all the above
Which of the following factors can cause brakes to fail or fade?
1. brakes being out of adjustment
2. excessive use of the service brakes
3. not relying enough on engine braking
4. all the above - ANSWER all the above
What is the best way to test your vehicle's low air pressure warning signal?
1. step on and off the brake pedal with the engine off to reduce air pressure below 60
psi
2. pump the brakes while your vehicle is fully on
3. manually let the air out of your brakes and see if the signal comes on
4. pump the brakes until the air pressure drops below 30 psi - ANSWER Step on and
off the brake pedal with the engine off to reduce air pressure below 60 psi
The purpose of a supply pressure gauge is :
1. to tell you how hot the air in the tank is
2. to warn you only if there is too little air in the tank
3. to tell you how much air is in the tank - ANSWER to tell you how much air is in the
tank
