W 350 Pickup V8-5.9L VIN Z (1990)
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If the rotor surface is deeply scored or warped or there is a complaint of brake roughness the rotor should be refaced.
When refacing a disc brake rotor the required 0.005 (0.127mm) TIR (Total Indicator Reading) and 0.001 (0.025mm) thickness variation MUST
BE MAINTAINED.
CAUTION: If the disc is not mounted properly the runout will be worse after refacing than before refacing. Extreme care in the operation of rotor
turning equipment is required.
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The use of a double straddle cutter which machines both sides of the disc at the same time is highly recommended.
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When mounting the disc on the lathe strict attention to the manufacturer's instructions is required.
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The collets, shafts and adaptors on the lathe and the bearing cups in the rotor MUST be clean and free from any chips or contamination.
Fig 2 Disc Measuring Points
DO NOT reface a disc brake rotor more than 0.030 inch less than the original disc minimum thickness. Reface both sides of rotor, not exceeding
