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Maximum Allowable Stock Removal

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  1. To measure maximum allowable stock remaining for refinishing on inner rotor face, use Disc Rotor Surface Gauge And Ball (T71P-1102-A). See Fig 1. Remove inner grease seal and bearing from rotor. Wipe inner and outer bearing cups clean.
    Fig 1: Measuring Maximum Allowable Refinishing Stock
    G91B13558Courtesy of FORD MOTOR CO.
  2. Carefully place gauge ball in inner bearing cup. DO NOT drop. Set micrometer at base line setting number. Using a 2 1/8" (54 mm) gauge ball, base line setting is.256" (6.50 mm). Position micrometer gauge bar on inner rotor face with micrometer centered over gauge ball.
  3. To measure distance between micrometer base line setting and gauge ball, turn micrometer down to touch top of ball. Calculate difference between reading and base line setting; difference is maximum allowable stock which can be removed from inner rotor face.
  4. When micrometer is set at base line setting and micrometer end touches top of ball, no additional material may be removed from rotor. If micrometer must be retracted from base line setting to allow gauge bar legs to rest on rotor face, rotor has been refinished beyond allowable limit. Replace rotor.