Brake Disc - Run-Out Inspection / Thickness and Parallelism Inspection

13-9prose procedure

Run-Out Inspection

1
Remove the front wheels, and support the front of the car on safety stands.
2
Remove caliper pin bolt, then pivot the caliper up out of the way on the caliper pin bolt, and remove the pads and pad retainers.
3
Inspect the disc surface for grooves, cracks, and rust. Clean the disc thoroughly and remove all rust.
4
Use the lug nuts to hold the disc securely against the hub, then mount a dial indicator as shown.
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.

Specification	Value
Brake Disc Runout - Service Limit	0.15 mm (0.006 in)

Brake Disc Runout - Service Limit

0.15 mm (0.006 in)

1
Remove the front wheels, and support the front of car on safety stands.
2
Move the caliper and pads out of the way as described in the preceding column.
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.
4
If the disc is beyond the limits for thickness or parallelism, 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.
A new disc should be ground if its run-out is greater than 0.10 mm (0.004 in.).

Specification	Value
Brake Disc Thickness - Standard	19 mm (0.75 in)
Brake Disc Thickness - Max: Refinishing Limit	17 mm (0.67 in)
Brake Disc Parallelism	The difference between any thickness measurements should not be more than 0.015 mm (0.0006 in.)

Brake Disc Thickness - Standard

19 mm (0.75 in)

Brake Disc Thickness - Max: Refinishing Limit

17 mm (0.67 in)

Brake Disc Parallelism

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