Air Brakes Sample Test B
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Air Brakes Sample Test B

1. How often should you check the alcohol evaporator in cold weather?
A Check the alcohol container and fill up as necessary once each week.
B Check the alcohol container once each fall before cold weather starts.
C Check the alcohol container and fill up as necessary every day.

2. What is a purpose of the safety release valve in the first tank?
A It protects the tank and the rest of the system from too much pressure
B It protects all of the system from dirt and oil.
C It helps build up air pressure quickly without running the engine.

3. What are two other names for the brake pedal?
A It can be called the foot valve or the relay valve.
B It can be called the foot valve or treadle valve.
C It can be called the relay valve or air compressor valve.

4. What can happen if the brake pedal is pressed and released too often?
A The brakes will be cooled down as soon as all the hot air is removed.
B Air pressure can build up until the brake pressure gauge is broken.
C Air can be let out of the system faster than the compressor can replace.

5. Where are foundation brakes found?
A At each wheel.
B On every other axle.
C On the drive wheels only.

6. Where are brake shoes and linings located?
A Directly beneath the foot valve.
B Inside each brake drum
C On the outside of certain brake drums.

7. What happens when a brake lining is pushed against the inside of the drum?
A The brakes will always squeal.
B This causes friction which slows the vehicle and creates heat.
C This causes heat which automatically causes the brakes to lock up.

8. On S-Cam brakes what happens to the air when you push the brake pedal?
A Air pressure forces out the push rod and moves the slack adjuster.
B Air pressure works only with wedge brakes and not with S-Cam brakes.
C Air pressure is converted into hydraulic pressure.

9. Which direction does the S-Cam force brake shoes when brakes are applied?
A It presses them against the outside of the brake drum.
B It presses them against the inside of the brake drum.
C It presses them around the brake drum.

10. If the air compressor begins to leak what keeps air in the tanks?
A The slack adjusters.
B The alcohol evaporator.
C The one-way check valve.



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