Flashcard 8 - Air Brakes Flashcard Set for the CDL
Back
Chock the wheels, release the parking brakes (press in the yellow knob), and shut the engine off.
Step on and off the brake pedal to release the air pressure built up in the system.
The parking brake or spring brakes should automatically come on when the air pressure falls to between 20-45 PSI.
The knob on the dash will pop out if they are working properly.
All Flashcard Sets for the CDL are now available as downloadable PDFs