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Consider brake-wear indicators on multi-disc-type brakes. The indicators show brake wear as a measure of the…

  • A
    movement of the brake unit piston.
  • B
    thickness of the brake unit’s lining material.
  • C
    drop in the brake system`s hydraulic pressure.
  • D
    brake pedal deflection in the brake system.

Refer to figure.
In the figure you see an example of a brake wear pin. As the brake unit lining material wears, the pack gets compressed more and more together. This brake wear pin will move together with the pack inwards which indicates wear. So the shorter the pin, the less life this brake pack has left.

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