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Stopping the Big Rigs - Quiz 4

1.

Which brakes are normally controlled by the primary system?

  1. Front brakes

  2. Rear brakes

  3. None of the above

2.

What's the purpose of the one way check valve in the primary system?

  1. Protect the primary tank from a failure in the supply tank

  2. Protect the primary tank from a failure in the secondary system

  3. None of the above

  4. Both A & B

3.

A manual means of draining the primary tank:

  1. Is required by FMVSS-121 law

  2. Is not necessary

  3. Prevents the accumulation of oil and water

  4. Both A & C

  5. None of the above

4.

A pressure gauge or separate needle is required for monitoring the air pressure in the primary system

  1. True

  2. False

5.

The primary circuit of the foot valve is:

  1. The furthest section from the treadle

  2. Always on the right side

  3. The closest section to the treadle

6.

There can be as much as a 9 psi differential between the primary and secondary circuits of the dual foot valve

  1. True

  2. False

7.

An air leak at the foot valve's exhaust port:

  1. Indicates a problem with the foot valve only

  2. May indicate a problem elsewhere in the system

  3. May indicate a problem with the foot valve

  4. Both B & C

8.

Relay valves are used in the rear brake system because a larger volume of air is needed and because of the size and number of brake chambers

  1. True

  2. False

9.

High crack pressure relay valves are used for:

  1. Balancing tractor to trailer combinations

  2. To compensate for wind drag

  3. To allow the driver ample reaction time

  4. None of the above

10.

An air leak at the service relay valve's exhaust port:

  1. Indicates a faulty foot valve

  2. May indicate a faulty relay valve.

  3. May indicate a faulty spring brake center seal

  4. None of the above

  5. Both B & C

11.

Actuating the brake adjuster in the opposite direction of wheel rotation can cause: brake chatter and aggressive brakes.

  1. True

  2. False

12.

Automatic brake adjusters

  1. Can be mixed with manual brake adjusters

  2. Should be mixed with different makes

  3. Adjust differently depending on the make

  4. None of the above

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