Flashcard 16 - Air Brakes Flashcard Set for the CDL


The correct answer is:

The pressure should drop no more than 3 psi per minute for a straight truck or 4 psi per minute for a combination vehicle.


Hint: You will see this question on your written CDL test. Memorize these two numbers.

Hint: Find a comfortable position for your foot on the brake pedal prior to starting this test. If you jiggle your foot or shift your leg during the test, you could move the pedal enough to cause the test to fail. A minute is a long time to hold a heavy brake pedal steady.

All Flashcard Sets for the CDL are now available as downloadable PDFs