CDL Permit- Air Brakes

What are the three types of braking systems mentioned in Section 5 of the Commercial Driver's License Manual?

• Service brake, parking brake, and emergency brake

• Hydraulic brake, disc brake, and drum brake

• Antilock brake, air brake, and electric brake

• Manual brake, automatic brake, and stability control brake

What is the function of the air compressor governor in an air brake system?

• It controls the speed of the air compressor.

• It automatically drains the air tanks.

• It stops the compressor from pumping air when the tank pressure is too high and allows it to start again when the pressure falls.

• It lubricates the air compressor.

What is the purpose of air storage tanks in an air brake system?

• To store hydraulic fluid for the brake system.

• To hold compressed air used to operate the brakes.

• To collect water and oil from the compressed air.

• To cool down the air before it enters the brake system.

How can air tank drains be manually operated according to the manual?

• By using an electric heating device.

• By turning a quarter turn or by pulling a cable.

• By pressing a button on the dashboard.

• By activating the emergency brake.

What are the two types of air tank drains mentioned in the manual?

• Manual and hydraulic

• Electric and pneumatic

• Automatic and manual

• Digital and analog

What is the purpose of automatic drain valves in air tanks?

• To prevent the air compressor from overheating.

• To automatically expel water and oil from the air tanks.

• To regulate the air pressure within the tanks.

• To manually drain the air tanks at the end of each day.

What is the purpose of an alcohol evaporator in an air brake system?

• To increase the air pressure in the system

• To put alcohol into the air system to reduce the risk of ice in air brake valves during cold weather

• To clean the air system

• To reduce the amount of air used by the system

At what pressure is the safety valve in the air brake system usually set to open?

• 100 psi

• 120 psi

• 150 psi

• 200 psi

What happens when the brake pedal is pushed down in an air brake system?

• The air pressure is released and the brakes are applied

• The air pressure is increased and the brakes are released

• The brake shoes are adjusted

• The brake fluid is circulated

What can excessive heat due to brake drums, shoes, and linings result in?

• Improved braking efficiency

• Reduced risk of brake failure

• Damage to the brake components

• Increased fuel efficiency