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Thickness and Parallelism
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Remove the front wheels.
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Using a micrometer, measure the brake disc thickness at eight points, about 45 ° apart and 10 mm (0.39 in.) in from the outer edge of the brake disc. Replace the brake disc if the smallest measurement is less than the max. refinishing limit.
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Brake disc thickness:
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Standard:
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23.0 mm (0.91 in.)
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Max. refinishing limit:
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21.0 mm (0.83 in.)
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Brake disc parallelism:
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0.015 mm (0.0006 in.) max.
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NOTE: This is the maximum allowable difference between the thickness measurements.
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If the brake disc is beyond the service limit for parallelism, refinish the brake disc 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.
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