Brake Rotor, Checking
Special tools and workshop equipment required
- Digital Dial Gauge: VAS6668/1 or Brake Disc Vernier Gauge: VAS6343
- Respective wheel is removed. Refer to WHEELS AND TIRES .
Formation of Cracks in the Component
- Hairline cracks on the brake rotor friction surface are often noticed during brake repairs. Hairline cracks up to 10 mm long are not a technical flaw and do not justify a brake rotor replacement.
- Brake rotors and brake pads that have a worn through friction surface should be replaced.
Measure the Wear
Due to varying contact pressures of the brake pistons to the brake pad there are different wear areas on the friction surface.
-- Measure the brake rotor in the center wear area = highest wear level
-- With Dial Gauge: VAS6668/1 or Brake Disc Vernier Gauge: VAS6343 at, at least, the different locations -1-, -2- and -3- by -a- = 120° apart from each other.
- If a measured value is under the one specified on the brake rotor: replace the brake rotors on each axle.