Brake Rotor/Disc: Testing and Inspection
RUNOUT1. Remove the front wheels, and Support the front of the car on safety stands.
2. Separate the brake hose clamp from the knuckle by removing the bolts.
3. Remove caliper bolt, then pivot the caliper up out of the way on the caliper pin, and remove the pads and pad retainers.
4. Inspect the disc surface for grooves, cracks, and rust. Clean the disc thoroughly and remove all rust.
Checking Front Disc Runout:
5. Use the lug nuts to hold the disc securely against the hub torque to service manual specifications, then mount a dial indicator as shown.
Brake Disc Runout Service Limit: 0.10 mm (0.004 in.)
6. If the disc is beyond the service limit, refinish the rotor with an on-car brake Lathe.
THICKNESS and PARALLELISM
1. Move the caliper and pads out of the way as described in the preceding article.
Measuring Disc Thickness And Parallelism:
2. Using a micrometer, measure disc thickness at eight points, approximately 450 apart and 10 mm (0.39 in.) in from the outer edge of the disc.
Thickness:
Fuel Injected Models - "LX-i and SE-i":
Standard: 21 mm (0.83 in.)
Max. Refinishing Limit: 19 mm (0.75 in.)
Carbureted Models - "DX and LX":
Standard:19.0 mm (0.75 in)
Max. Refinishing Limit:17.0 mm (0.67 in)
Parallelism:
The difference between any thickness measurements should not be more than 0.015 mm (0.0006 in.).
3. If the disc is beyond the limits for thickness or parallelism, refinish the rotor with an on-car brake lathe.
NOTE: 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.