Practice question
On the New Jersey CDL Air Brakes knowledge 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 60 psi
- Drain the secondary tank only
Answer: B — 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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Practice more: NJ CDL Air Brakes Test Practice Questions - New Jersey Commercial Driver License (CDL) Air Brakes Knowledge Test Exam →