CDL AIR BRAKES PRACTICE TEST &ANSWERS
100%
CDL Air Brakes Practice Test & Answers
1. During normal driving, spring brakes are usually held back by:
A. bolts
B. air pressure
C. spring pressure
2. The brake pedal in an air brake system:
A. controls the speed of the air compressor
B. controls the air pressure applied to put on the brakes
C. is connected to slack adjusters by a series of rods and linkages
3. The brake system that applies and releases the brakes when the driver uses the
brake pedal is what system?
A. emergency system
B. service system
C. parking system
, CDL AIR BRAKES PRACTICE TEST &ANSWERS
100%
4. All air braked equipped vehicles must have what?
A. a supply pressure gauge
B. an application gauge
C. a backup hydraulic system
5. If your truck or bus has a dual parking control valve, you can use pressure from another
tank to:
A. release the spring brakes to move the vehicle in an emergency
B. apply more pressure if the main tank is getting low
C. balance the service brake system whenever you are parked
6. The most common type of foundation brake found on heavy vehicles is the:
A. wedge brake
B. s-cam drum brake
C. disc brake
7. Parking or emergency brakes of trucks and buses can be legally held on by what?
A. spring pressure
, CDL AIR BRAKES PRACTICE TEST &ANSWERS
100%
B. fluid pressure
C. air pressure
8. If your vehicle has an alcohol evaporator, it is there to:
A. rid the wet tank of alcohol that collects and sits at the bottom
B. eliminate the need for daily tank draining
C. reduce the risk of ice in valves and other parts in cold weather
9. Some air brake systems have an alcohol evaporator. What might happen if you don't
keep the unit filled with alcohol?
A. the s-cam may not rotate back when you release the pedal
B. ice may form in the tanks and cause the brakes to fail
C. ice may form on the drums and warp them
10. The most important thing to do when the low air pressure warning comes on is:
A. downshift
B. turn the warning off
C. stop and park safely as soon as possible
100%
CDL Air Brakes Practice Test & Answers
1. During normal driving, spring brakes are usually held back by:
A. bolts
B. air pressure
C. spring pressure
2. The brake pedal in an air brake system:
A. controls the speed of the air compressor
B. controls the air pressure applied to put on the brakes
C. is connected to slack adjusters by a series of rods and linkages
3. The brake system that applies and releases the brakes when the driver uses the
brake pedal is what system?
A. emergency system
B. service system
C. parking system
, CDL AIR BRAKES PRACTICE TEST &ANSWERS
100%
4. All air braked equipped vehicles must have what?
A. a supply pressure gauge
B. an application gauge
C. a backup hydraulic system
5. If your truck or bus has a dual parking control valve, you can use pressure from another
tank to:
A. release the spring brakes to move the vehicle in an emergency
B. apply more pressure if the main tank is getting low
C. balance the service brake system whenever you are parked
6. The most common type of foundation brake found on heavy vehicles is the:
A. wedge brake
B. s-cam drum brake
C. disc brake
7. Parking or emergency brakes of trucks and buses can be legally held on by what?
A. spring pressure
, CDL AIR BRAKES PRACTICE TEST &ANSWERS
100%
B. fluid pressure
C. air pressure
8. If your vehicle has an alcohol evaporator, it is there to:
A. rid the wet tank of alcohol that collects and sits at the bottom
B. eliminate the need for daily tank draining
C. reduce the risk of ice in valves and other parts in cold weather
9. Some air brake systems have an alcohol evaporator. What might happen if you don't
keep the unit filled with alcohol?
A. the s-cam may not rotate back when you release the pedal
B. ice may form in the tanks and cause the brakes to fail
C. ice may form on the drums and warp them
10. The most important thing to do when the low air pressure warning comes on is:
A. downshift
B. turn the warning off
C. stop and park safely as soon as possible
