Disc Runout Inspection

Disc Runout Inspection

A Wheel nuts and plain washer

1. Raise front of vehicle.
2. WARNING: Support on safety stands.
3. Remove road wheel(s).
4. Remove the brake pads.
5. Inspect the disc surface for damage or cracks. Clean the disc thoroughly and remove all rust.
6. Use the wheel 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 10mm (0.4 in) from the outside edge of the disc.

Brake Disc Runout = 0.10mm (0.004 in)

6. If the disc is beyond the service limit, refinish with an on - car brake lathe as recommended in the Service Tools and Equipment Programme.

Max. Refinishing Limit = 21.0mm (0.83 in)

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

Disc Thickness and Parallelism Inspection

1. Raise front of vehicle.
2. WARNING: Support on safety stands.
3. Remove road wheel(s).
4. Remove the brake pads.
5. Using a micrometer, measure disc thickness at eight points, approximately 45° apart and 10mm (0.4 in) in from the outer edge of the disc.

Brake Disc Thickness = 23.0mm (0.91 in)
Max. Refinishing Limit = 21.0mm (0.83 in)

Note: Replace the brake disc if the smallest measurement is less than the max. refinishing limit.

Brake Disc Parallelism = 0.015mm (0.0006 in) max.

Note: The maximum difference between any thickness measurements should not be more than specification.

5. If the disc is beyond the service limit, refinish with an on - car brake lathe as recommended in the Service Tools and Equipment Programme.