FREE CDL Air Brake Pre-Trip Inspection Questions and Answers

0%

When inspecting the air brake system during a pre-trip, what should you check regarding the air compressor?

Correct! Wrong!

During a pre-trip inspection, ensure the air compressor is securely mounted, free of leaks, and functions properly. Verify the governor's cut-in and cut-out pressures (typically 100-125 psi).

How do you check for leaks in the air brake system?

Correct! Wrong!

After building air pressure to its maximum, turn off the engine, release the brakes, and observe the pressure gauge. The system should lose no more than 2 psi per minute for single vehicles and 3 psi per minute for combination vehicles. If applying brakes, the loss should not exceed 3 psi (single) or 4 psi (combination).

What is the proper way to test the low air pressure warning system?

Correct! Wrong!

The low air pressure warning must activate before air pressure drops below 55-75 psi. This ensures drivers are alerted to low pressure before the system fails completely.

How do you test the parking brake during a pre-trip inspection?

Correct! Wrong!

To test the parking brake, engage it, then gently pull the vehicle forward in a low gear. The vehicle should not move if the parking brake is working correctly.

How do you perform the air pressure build-up test?

Correct! Wrong!

In the air pressure build-up test, observe the compressor's performance. It should build pressure from 85 to 100 psi within 45 seconds in dual air systems (for large vehicles). If it takes longer, the compressor may be faulty.

Premium Tests $49/mo
FREE February-2025