Thickness variation inspection

Remove the wheel and tire. (See WHEEL AND TIRE REMOVAL/INSTALLATION .)
Clean the disc plate-to-pad friction surface using a brake cleaner.
Measure the points indicated in the illustration using a caliper (micrometer).

Fig 1: Locating Front Disc Plate Points
Courtesy of MAZDA MOTORS CORP.
Subtract the minimum value from the maximum, and if the result is not within the specification, machine the disc plate using a lathe.
Thickness variation limit

0.015 mm {0.00059 in}
WARNING:
- Do not exceed minimum disc plate thickness.