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What can happen if drive-axle wheels lock on a slippery surface?
- A.The tractor will steer more precisely
- B.Only the trailer brakes are affected
- C.Drive wheel lockup prevents all skids
- D.The tractor can jackknife as the rear of the tractor swings around
Correct answer
D. The tractor can jackknife as the rear of the tractor swings around
Why
The drive axle holds the back of the tractor in line, and locked drive tires lose that lateral grip. ABS control at the drive wheels is a direct defence against the tractor folding against the trailer.
Manual topic: Air Brakes - ABS · From the Air Brakes practice bank (AB-203).