Brake Rotor Thickness Measurement

Brake Rotor Thickness Measurement

Tools Required:
J 26900-1 Combimike Micrometer

1 Reposition and support the caliper and the brake pads. Refer to Brake Pads Replacement - Front or to Brake Pads Replacement - Rear as applicable.
2. Clean the brake pad lining contact surfaces of the brake rotor with denatured alcohol or an equivalent brake cleaner.
3. Use the J 26900-1, or the equivalent micrometer, in order to measure the thickness of the brake rotor. Measure the thickness of the rotor at 4 or more points equally spaced around the rotor. Position the J 26900-1, or the equivalent, at the same distance from the outside edge of the rotor, in the brake pad lining contact area.
4. Compare the measurements to the following specifications:
Specifications
^ The minimum thickness of the front brake rotor after refinishing is 23.0 mm (0.906 in).
^ The minimum thickness of the rear brake rotor after refinishing is 7.5 mm (0.295 in).
^ The discard specification for the front brake rotor is 23.0 mm (0.906 in).
^ The discard specification for the rear brake rotor is 7.5 mm (0.295 in).
5. If the smallest measurement exceeds the minimum thickness specification, you may be able to resurface the brake rotor, depending upon the thickness variation and the surface condition. Refer to Brake Rotor Thickness Variation Measurement and to Brake Rotor Surface and Wear Inspection.
6. If the smallest measurement is equal to or less than the minimum thickness specification or the discard specification, replace the brake rotor. Refer to Brake Rotor Replacement - Front or to Brake Rotor Replacement - Rear as applicable. Service and Repair