Commercial Drivers License ( CDL ) Air Brake Practice Test Page 5

30. Total stopping distance for air brakes is longer than that for
       hydraulic brakes due to ______ distance.

a. perception.
b. reaction.
c. brake lag.
d. effective braking.


31. The most common type of foundation brake found on heavy vehicles is the:

a. Disc.
b. Wedge drum.
c. S-cam drum.
d. None of the above.


32. Parking or emergency brakes of trucks and buses
       can be legally held on by _____ pressure.

a. spring.
b. fluid.
c. air.
d. atmospheric.


33. If the air compressor develops a leak, what keeps the air in the tanks?

a. The tractor protection valve.
b. The emergency relay valve.
c. The one-way check valve.
d. Nothing.




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Answers:
    (30) c
    (31) c
    (32) a
    (33) c

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