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A vehicle has ABS on the tractor but the trailer does not have ABS. What should the driver understand?
- A.The combination still benefits from the tractor system, but the unprotected trailer wheels can still lock and swing, so braking must remain smooth and planned
- B.The trailer automatically gains ABS through the air lines
- C.ABS on any unit makes lockup impossible everywhere
- D.The trailer should be braked with the hand valve only
Correct answer
A. The combination still benefits from the tractor system, but the unprotected trailer wheels can still lock and swing, so braking must remain smooth and planned
Why
ABS protects only the wheels it controls and senses. Mixed equipment still drives better than no ABS at all, but the driver cannot assume the trailer will behave like an ABS-equipped unit in a panic stop.
Manual topic: Air Brakes - ABS · From the Air Brakes practice bank (AB-205).