Important: Do NOT refinish the brake rotors in order to correct any of the following
complaints:
• Brake noise (growl/squeal) • Premature brake lining wear • Cosmetic or superficial corrosion of the rotor braking surface • Rotor discoloration • Severe scoring of the rotor braking surface (groove depth in excess
of 1.5 mm (0.060 in) • Brake pulsation caused by the following: - Brake rotor thickness variation in excess of 0.025 mm (0.001 in) - Corrosion or pitting that is deeper than the rotor braking surface
The following brake lathes are approved and achieve satisfactory results.
| • | Accu Turn® (off-vehicle) |
| • | Pro-Cut® (on-vehicle) |
Tools Required
J 42450-A Hub Cleaning Kit
- Use the J 42450-A in order to clean the wheel bearing/hub.
- Use a micrometer in order to measure the thinnest point of the brake rotor. If the thinnest point of the brake rotor exceeds the brake rotor minimum thickness, do NOT refinish the brake rotor. Replace the brake rotor.
- Refinish the brake rotor. Refer to the brake lathe manufacturer's operating instructions.
- After machining the rotor, use 120 grit aluminum oxide sandpaper and a non-directional rotor finisher (if available) in order to create a non-directional braking surface.
- Clean the braking surfaces with denatured alcohol or with a suitable brake cleaner.
Notice: Whenever the brake rotor has been separated from the wheel bearing flange, clean any rust or foreign material from the mating surface of the rotor and flange with the J 42450 hub cleaning kit. Failure to do this may result in increased lateral runout of the rotor and brake pulsation.
Important: Failure to obtain the best possible braking surface finish may cause the vehicle to stop with difficulty.
Notice: Improperly tightened wheel bolts or nuts can lead to brake pulsation and rotor damage. In order to avoid expensive brake repairs, evenly tighten the wheel bolts or nuts to the proper torque specification.
