CLP - Commercial Learner's Permit Air Brake Systems Questions and Answers

Question 1

During a static air brake leakage test on a single vehicle, what is the maximum permissible pressure drop in one minute?

Accepted Answer

2 psi

Answer

1 psi

Answer

3 psi

Answer

4 psi

Question 2

A driver is performing an air brake check. At what pressure range should the low air pressure warning light and buzzer activate?

Accepted Answer

At or before 55-60 psi

Answer

Below 100 psi

Answer

Between 80 and 90 psi

Answer

Between 20 and 45 psi

Question 3

In a vehicle with a properly functioning dual air brake system, what is the expected time for the air compressor to build pressure from 85 to 100 psi?

Accepted Answer

Within 45 seconds

Answer

Within 15 seconds

Answer

Within 30 seconds

Answer

Within 60 seconds

Question 4

A driver is operating a truck-tractor with a trailer. While driving, the low air pressure warning comes on. What is the safest immediate course of action?

Accepted Answer

Pull over and stop in the safest possible location.

Answer

Continue driving to the nearest service station.

Answer

Pump the brake pedal to try and build pressure.

Answer

Increase speed to let the compressor work faster.

Question 5

Which of the following brake systems is primarily responsible for applying and releasing the brakes when you use the foot pedal during normal driving?

Accepted Answer

Service brake system

Answer

Emergency brake system

Answer

Parking brake system

Answer

Spring brake system

Question 6

If air pressure drops into the 20-45 psi range, what is most likely to occur?

Accepted Answer

The low-pressure warning light will turn off.

Answer

The air compressor will turn on.

Answer

The service brakes will become more sensitive.

Answer

The tractor protection valve and/or parking brake valve will pop out.