Front Brake Disc

Runout Inspection

1. Loosen the front wheel lug nuts slightly, then raise the car and support on safety stands. Remove the front wheels.
2. Remove the brake pads (page 19-8).

3. Inspect the disc surface for cracks, and rust. Clean the disc thoroughly and remove all rust.

4. Use lug nuts and suitable plain washers to hold the disc securely against the hub, then mount a dial indicator as shown and measure the runout at 10 mm (0.39 in) from the outer edge of the disc.

Brake Disc Runout:
Service Limit: 0.10 mm (0.004 in)

5. If the disc is beyond the service limit, refinish the rotor 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.

NOTE: A new disc should be refinished if its runout is greater that 0.10 mm (0.004 in).

Thickness and Parallelism Inspection

1. Loosen the front wheel lug nuts slightly, then raise the car and support on safety stands. Remove the front wheels.
2. Remove the brake pads (page 19-8).
3. Using a micrometer, measure disc thickness at eight points, approximately 45° apart and 10 mm (0.39 in) in from the outer edge of the disc.

Brake disc thickness:
Standard:   21 mm (0.827 in) Max. Refinishing Limit: 19 mm (0.748 in)

Brake Disc Parallelism:
The difference between any thickness measurements should not be more than 0.015 mm (0.0006 in).

4. If the disc is beyond the service limit for thickness or parallelism, refinish the rotor with an on-car brake lathe. The Kwik-Lathe produced by KwikWay Manufacturing Co. and the "Front Brake Disc Lathe" offered by Snap-on Tools Co. are approved for this operation.