Brake Rotor, Weighing
Brake rotor with stamped-on minimum weight.
Special tools and workshop equipment required
- Commercially available scale with a measuring exactness of ±1 gram.
The brake rotor ring and the brake rotor cup are attached to each other and must never be separated. Never loosen the threaded connector on the brake rotor cup.
Procedure
-- To weigh, remove the front brake rotor
-- To weigh, remove the rear brake rotor
Depending on the version, the minimum weight of the brake rotor is stamped on the brake rotor cup. If the stamped-on minimum weight has been reached or falls short, replace the brake rotor. Always replace the brake rotors on both sides of the axle.
- Clean and dry the brake rotor before weighing it.
Never clean the brake rotor with water or any other fluid. This will make the measuring result incorrect.
The brake rotor vent holes must be free of dirt. It may be necessary to use something suitable to clean the holes.
Clean the brake rotor thoroughly with compressed air between the cooling channels and the vent holes.
-- Carefully lay the cleaned brake rotor on the scale.
If the stamped-on minimum weight has been reached or falls short, replace the brake rotor. Always replace the brake rotors on both sides of the axle.
Always replace the brake rotors on both sides of the axle when:
- the brake discs must be replaced because they are worn,
- the replacement brake rotor has undergone a technical change, which is identifiable by the changed part number.
In this case, replace the brake rotors on each side of the axle.
Brake pads likewise must always be replaced on both sides of the axle.