CDL Air Brakes

The reason you perform the static air pressure loss and applied air pressure loss tests is to make sure:

• The pressure in the tank is low

• The system is not leaking

• The hydraulic brakes are working

Which three tests would you perform on a hydraulic system?

• The emergency or parking brake test and the low air pressure warning test, service brake test

• The Leak test, emergency/parking brake and service brake test.

• The emergency or parking brake test, the spring brake test and the low air warning test

The____controls the amount of air pumped into the tanks, which is measured in terms of pounds per square inch or psi

• governor

• spring

• air brake

The low air pressure warning device should come on a about:

• 55 to 35 psi

• 65 to 55 psi

• 75 to 65 psi

Most of the brake fluid in hydraulic brakes is stored in the;

• Brake lines

• Master Cylinder

• Pistons

Which conditions are front wheel brakes good under?

• Only good weather

• Only wet or icy conditions

• Not ideal under any conditions

• All weather conditions

Which of the following is a reason that air tanks must be drained?

• Your brakes may fail due to the water freezing

• Your left side brake will cease to operate

• You will drive too quickly if they are not

• Your transmission fluid may drain out

Which vehicles must have low air pressure warning signals?

• Those built after 2010 must have low air pressure warning signals

• Those built after 2005 must have low air pressure warning signals

• All vehicles with air brakes currently in operation must have low air pressure warning signals

• Warning signals are optional

How can you tell if your vehicle is equipped with an anti-lock braking system?

• If the vehicle is manufactured after 2000

• If the vehicle is manufactured after 2010

• Still an optional system

• If the vehicle is manufactured after 1998

Spring brakes are

• All of the these

• brakes that come on automatically on a truck or tractor when the psi drops too low

• made up of powerful springs that are held in back by air pressure while you are driving

• not going to have full effect until your psi drops to a certain range--often 20 to 30 psi