Disc Thickness and Parallelism

DX Model (A Type)






Si Model (B Type)






HF Model (C Type)


Thickness and Parallelism Inspection
1. Remove the front wheels, and support the front of the 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.
Brake Disc Thickness
HF Model (C Type)
Standard: 17 mm (0.67 in)
Max: Refinishing Limit: 15 mm (0.59 in)
DX Model (A Type)
Standard: 21 mm (0.83 in)
Max: Refinishing Limit: 19 mm (0.75 in)
SI Model (B Type)
Standard: 19 mm (0.75 in)
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.)
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.

NOTE: A new disc should be ground if its run-out is greater than 0.10 mm (0.004 in.).