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If the tractor has ABS but the trailer does not (or its ABS has failed), how should you brake in an emergency?
- A.Watch the trailer in the mirrors and be ready to ease off the brakes if the trailer starts to lock up and swing, while keeping the stop as straight as possible
- B.Brake exactly as if every unit had ABS and never look back
- C.Use only the hand valve until the vehicle stops
- D.Turn the tractor ABS off so the systems match
Correct answer
A. Watch the trailer in the mirrors and be ready to ease off the brakes if the trailer starts to lock up and swing, while keeping the stop as straight as possible
Why
Mixed equipment is common, and the unprotected trailer is the weak link that can still lock and swing. The driver becomes the ABS for that unit by monitoring it and modulating pressure when it starts to slide.
Manual topic: Combination Vehicles - Trailer ABS · From the Combination Vehicles practice bank (CV-210).