Air Brakes

Question 0

Your vehicle’s single brake system needs adjustment if

Answer 0

The compressor cuts out between 70-90 PSI

Question 1

The safety valve in the air compressor tank is set to open at

Answer 1

150 PSI

Question 2

When the safety valve releases air it means that

Answer 2

Too much air is in the compressor
The pressure has exceeded 150 PSI
Something is wrong and you should have it checked by the mechanic

Question 3

A fully charged air system typically has how much PSI?

Answer 3

125

Question 4

To test the air leakage rate you should:

Answer 4

Turn off the engine and release the service brake

Question 5

With dual air systems the air pressure should build from

Answer 5

85-100 PSI in 45 seconds

Question 6

To determine if slack adjusters need adjustment

Answer 6

Release both the service and parking brakes

Question 7

If your air compressor stops working

Answer 7

You’ll still have air pressure left in the air tanks

Question 8

Fanning airbrakes…

Answer 8

Decreases air pressure

Question 9

The air compressor is connected to the engine through

Answer 9

Gears or a v belt

Question 10

Which of the following makes the total stopping distance for air brakes longer than that for hydraulic brakes

Answer 10

Bake lag distance

Question 11

If a straight trailer goes into a front wheel skid it will

Answer 11

Go straight ahead even if the steering wheel is turned