California CDL Air Brakes Test

During the air brake pre-trip, how do you test that the spring brakes apply automatically?

Apply the foot brake hard while driving Continue fanning the brakes until air pressure drops far enough; the spring brakes should apply between roughly 20 and 45 psi Pull the parking brake at 55 psi Drain the secondary tank only

Correct Answer:

Continue fanning the brakes until air pressure drops far enough; the spring brakes should apply between roughly 20 and 45 psi

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