Removing-refitting brake disc

Removing-refitting brake disc

When refitting, remove any possible traces of rust to ensure that the disc is perfectly perpendicular to the hub.

BRAKE DISCS

Checking and measuring

The minimum allowable thickness for brake discs is 9 mm. If it measures less than this, the disc must be replaced. In the case of wear or deep grooves, the surfaces of the brake disc can be machined. After grinding the brake disc must not be less than 9.35 mm thick.

NOTE The parallel tolerance of the disc surfaces must be ± 0.015 mm or else the brake pedal will vibrate when used.

Checking run out of brake disc

If the brake pads have to be replaced, it is advisable to check that the disc is no more than 0.15 mm off centre.
This is measured 2 mm from the external diameter of the disc.