Air Brake Check

Question 1

The air compressor must cut-in no lower than ___.

Answer 1

85 psi

Question 2

Check air compressor governor cut-out pressure Run the engine at a fast idle. The air governor will cause the compressor to cut-out at ___ max.

Answer 2

130 psi

Question 3

Normal acceptable cut-out range is from ____

Answer 3

110 to 120 psi

Question 4

Test air leakage rate With a fully-charged system (typically ____), turn off the engine, release all brakes and then apply full steady pressure to the brake pedal (brake on) and hold (for one full minute).

Answer 4

125 psi

Question 5

The air pressure should not fall more than :

- ___ in one minute for single vehicles, or

Answer 5

3 psi

Question 6

The air pressure should not fall more than :

- ___ in one minute for combination vehicles.

Answer 6

4 psi

Question 7

Test low pressure warning signal With the engine off, low pressure warning device must activate between ____.

Answer 7

55 and 75 psi

Question 8

Non-power steering: Check for excessive play by turning steering wheel back and forth. Play should not exceed ____ (or about ____ on a 20-inch wheel).

Answer 8

10 degrees / two inches

Question 9

Power steering: With the engine running, check for excessive play by turning the steering wheel back and forth. Play should not exceed ____ (or about ___ on a 20-inch wheel) before front wheels begin to move.

Answer 9

10 degrees / two inches