Air Brakes Test 1 - Crist CDL's Online Testing Center

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Air Brakes Test 1
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Modern air brake systems combines three different systems. The are the service brakes, the parking brakes and the:

a. S-cam brakes.

b. Drum brakes.

c. Foot brakes.

d. Emergency brakes.

Oil and water usually collect in compressed air tanks. If you do not have an automatic tank drain, when should you drain the air tanks?

a. After every working day.

b. After every four hours of service.

c. Once a week.

d. Every other week.

Why drain water from the compressed air tanks?

a. To keep from fouling the air compressor oil.

b. Water can freeze in cold weather and cause brake failure.

c. The low boiling point of water reduces braking power.

d. Water over cools the compressor.

Air brake equipped vehicles must have:

a. A supply pressure gauge.

b. An air use gauge.

c. At least two brake heaters.

d. A backup hydraulic system.

What can legally hold a parking or emergency brake in position for a truck, truck tractor or bus?

a. Fluid pressure

b. Air pressure

c. Spring pressure

d. Any of the above

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