Question

How does letting up on the brake pedal release the brakes?

Accepted Answer

Some compressed air is let out of the system, causing the brake pads and/or shoes to disengage.

Answer

The action releases the brake pads.

Answer

Compressed air is pushed back into the air tanks.

Answer

The system releases the brakes through a combination of air being released and the brake levers being loosened.

Question 9 - Air Brakes Test Practice Test for the CDL