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Air Brakes Test



Q. 1) What can legally hold a parking or emergency brake in position for a truck, truck tractor or bus?
a) Fluid pressure
b) All these answers are correct
c) Spring pressure
d) Air pressure

Q. 2) TO check the free play of manual slack adjusters S-Cam brakes you should:
a) Park on a straight grade, release the parking brake, apply the service brakes, and check for vehicle movement
b) Park on the level ground, check the wheels, and release the parking brakes
c) Stop on level ground and apply the parking brakes
d) Park on level ground and drain off air pressure before adjusting

Q. 3) The S-Cam forces the brake shoes away from one another and presses them against the inside of the brake drum. It is called S-Cam because:
a) It is shaped like the letter S
b) It is shaped like the letter N
c) It is shaped like the letter Z

Q. 4) When you put on the brakes by pushing down the brake pedal:
a) Air pressure is applied to the brake pads
b) The air pressure is reduced to the brake pads
c) Compressed air is let go out of the system

Q. 5) What are the slack adjusters?
a) It is an adjusting nut on the backside of the brake drum used for adjusting the brakes
b) It is an adjusting nut under the cab to adjust the springs
c) It is a space between the back wheels

Q. 6) Front wheel brakes are good under all conditions.
a) True
b) False

Q. 7) If you are away from your vehicle only a shirt time, you don't need to use the parking brake.
a) True
b) False

Q. 8) How can you test the low pressure warning signal?
a) Shut off the engine and see if the air pressure leaks down
b) Shut off the engine with enough air pressure. Turn on the electrical power and step on and off the brake pedal until the low air pressure warning signal comes on
c) While the engine is running, step on and off the brake pedal

Q. 9) Air loss in a straight truck or bus should not be more than _______ with the engine off and brakes on.
a) 1 psi in one minute
b) 3 psi in one minute
c) 2 psi in 45 seconds
d) 1 psi in 30 seconds

Q. 10) Air brakes are really three different braking systems: service brake, parking brake and emergency brake.
a) False
b) True

Q. 11) Should you ever leave your vehicle unattended without applying parking brakes or chocking the wheels?
a) Yes
b) No

Q. 12) Oil and water usually collect in compressed air tanks. If you don not have an automatic tank drain, when should you drain the air tanks?
a) Every other weak
b) After every four hours of service
c) Once a week
d) After every working day

Q. 13) What do air brakes used to make the brakes work?
a) Compressed gas
b) Compressed oil
c) Compressed air

Q. 14) The air tanks are used to hold compressed air
a) False
b) True

Q. 15) The service brake applies and releases:
a) In the event of an emergency
b) The brake when you use the brake pedal during normal driving
c) The parking brake when you use the parking brake control

Q. 16) If the oil and water collect in the air tanks what can happen to the brakes?
a) The brakes could heat up
b) The brakes could lock up
c) The brakes could fail

Q. 17) If the air compressor should develop a leak. What keeps the air in the tanks?
a) The air compressor
b) The one way check valve
c) The emergency relay valve
d) The tractor protection valve

Q. 18) What are the maximum leakage rates?
a) Less than two psi in one minute for single vehicles and less than three psi in one minute for combination vehicles
b) Less than four psi on one minute for single vehicles and less than eight psi in one minute for combination vehicles
c) Less then six psi for all vehicles

Q. 19) What are spring brake?
a) brakes used for parking
b) The spring on the brake pedal
c) If the air brakes leak down, springs press the brakes on to stop the vehicle

Q. 20) The emergency brake system:
a) Uses the service brake to stop the vehicle in the event of brake system failure
b) Uses parts of the service and parking brake system to stop the vehicle in the event of a brake system failure
c) Uses the parking brake to stop the vehicle in the event of a brake system failure

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