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What should you expect to feel or hear when ABS is actively controlling a hard stop on many vehicles?
- A.Complete silence and no pedal feedback in every design
- B.The pedal always falls to the floor
- C.Some pedal pulsation, clicking, or motor and valve sounds as the system rapidly holds and releases pressure at individual wheels
- D.A continuous air leak from every chamber
Correct answer
C. Some pedal pulsation, clicking, or motor and valve sounds as the system rapidly holds and releases pressure at individual wheels
Why
Rapid pressure modulation is mechanical work, and many systems let the driver sense it through the pedal or hear the valves cycling. Those sensations during a hard stop are usually the system working, not a reason to let off the brakes.
Manual topic: Air Brakes - ABS · From the Air Brakes practice bank (AB-213).