Fault assessment of brake discs

Fault assessment of brake discs

Squeaking noise during braking

Provided that the brake system does not exhibit any design or other fundamental faults, the brake disc contributes to a squeaking noise only if the gap between it and the brake pad is inadequate or the disc surfaces are damaged or corroded. It is true to say, however, that brake discs, because of their geometry, are suspect to noise issues.

This fault can be remedied as follows:

  • Check the state of wear and the surface condition of the brake pads and brake discs and replace them if necessary
  • Verify that the fitted brake pads are manufacturer-approved and suitable for the vehicle
  • Check that anti-noise elements (damping shims, damping lacquer, pastes) are fitted and in good working condition
  • Check the freedom of movement of the brake pad guide ramps and caliper piston

Disc brakes achieve their braking effect through dry friction, which inherently tends to cause vibration and therefore noise. Because of the influencing factors and operating conditions described above, a complete suppression of braking noise is extremely difficult, but with modern technology a high level of noise suppression can be achieved.