Air Brakes Test 6 - Crist CDL's Online Testing Center

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Air Brakes Test 6
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If your truck or bus has dual parking control valves it means that you can use pressure from a separate tank to:

a. Balance the service brake system.

b. Release the spring brakes to move a short distance.

c. Stay parked without using up service air pressure.

d. Apply more brake pressure if the main tank is getting low.

A straight truck or bus air brake system should not leak at a rate of more than ____ PSI per minute with the engine off and the brakes released.

a. 4

b. 3

c. 2

d. 1

If your vehicle has an alcohol evaporator, it is there to:

a. Reduce the risk of ice in air brake valves in cold weather.

b. Eliminate the need for daily tank draining.

c. Rid the wet tank of alcohol that condenses and sits at the bottom.

d. Boost tank pressure the same way that superchargers boost.

If you must make an emergency stop, you should brake so that you:

a. Use the full power of the brakes and lock them.

b. Can steer hard while braking hard.

c. Stay in a straight line and can steer.

d. Use the hand brake first.

Your truck or bus has a dual air brake system. If a low air pressure warning comes on for only one system, what should you do?

a. Reduce your speed and drive to the nearest garage for repairs.

b. Continue at normal speed and find a garage before the brakes lock.

c. Reduce your speed and test the remaining system while under way.

d. Stop. Safely park, and continue only after the system is fixed.

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