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Why should the parking brakes not be relied on alone when parking a trailer on a grade without the tractor?
- A.Parking brakes are illegal to use on grades
- B.Trailers have no parking brakes at all
- C.Chocks are only for decoration at inspections
- D.Wheel chocks should also be used, because a slow air leak could eventually release or weaken the hold on some systems and trailers can be moved by outside forces
Correct answer
D. Wheel chocks should also be used, because a slow air leak could eventually release or weaken the hold on some systems and trailers can be moved by outside forces
Why
Chocks are cheap insurance that does not depend on air, seals, or anyone remembering a knob. Safe parking practice layers the spring brakes and chocks together, especially for dropped trailers.
Manual topic: Air Brakes - Spring Brakes and Parking Brakes · From the Air Brakes practice bank (AB-108).