The thickness of the discs should be checked with a micrometer by measuring the thickness of the disc at four or more points around the circumference of the disc. All measurements should be made at the same distance from the edge of the disc to its center (figure 6-14).
Figure 6-14. Measuring the thickness of the disc with a micrometer
If at least one measurement point the thickness is less than 9.5 mm, the disc must be replaced.
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