Front
Front Brake Disc InspectionRunout
1. Raise the front of the vehicle, and support it with safety stands in the proper locations.
2. Remove the front wheels.
3. Remove the brake pads.
4. Inspect the brake disc surface for damage and cracks. Clean the brake disc thoroughly, and remove all rust.
5. Install suitable flat washers (A) and wheel nuts, and tighten the nuts to the specified torque to hold the brake disc securely against the hub.
6. Set up the dial gauge against the brake disc as shown, and measure the runout at 10 mm (3/8 in.) from the outer edge of the brake disc.
Brake disc runout:
Service limit: 0.10 mm (0.004 in.)
7. If the brake disc is beyond the service limit for runout, refinish the brake disc.
Thickness and Parallelism
1. Raise the front of the vehicle, and support it with safety stands in the proper locations.
2. Remove the front wheels.
3. Remove the brake pads.
4. Using a micrometer, measure brake disc thickness at eight points, approximately 45° apart and 10 mm (3/8 in.) in from the outer edge of the brake disc. Replace the brake disc if the smallest measurement is less than the max. refinishing limit.
Brake disc thickness:
Standard: 27.9-28.1 mm (1.10-1.11 in.)
Max. refinishing limit: 26.0 mm (1.02 in.)
Brake disc parallelism: 0.015 mm (0.0006 in.) max.
NOTE: This is the maximum allowable difference between the thickness measurements.
5. If the smallest measurement is less than the max. refinishing limit, replace the brake disc.
6. If the brake disc is beyond the service limit for parallelism, refinish the brake disc.
Refinishing
NOTE: Refinish the brake disc with an on-car brake lathe. The Kwik-Lathe produced by Kwik-Way Manufacturing Co. and the "Front Brake Disc Lathe" offered by Snap-on Tools Co. are approved for this operation.
1. Remove the brake caliper assembly.
2. Install the brake lathe brackets (A) to the knuckle (B).
NOTE: Place two bolts (C) in the brackets before tighten the bolts (D).
3. Install the on-car brake lathe adapters (A) to the brake lathe bracket (B), then refinish the brake disc.
4. Measure the brake disc runout, thickness, and parallelism.
NOTE:
^ If the brake disc is beyond the service limit for refinishing, replace it.
^ A new brake disc should be refinished if its runout greater than 0.10 mm (0.004 in.).
Max. refinishing limit: 26.0 mm (1.02 in.)