W 150 Ramcharger V8-318 5.2L (1989)
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This marking includes 0.030 inch (0.762mm) allowable rotor wear beyond the recommended 0.030 inch (0.762mm) of disc refacing.
Example:
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Minimum Allowable Thickness 0.940 in (23.8mm)
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Allow for Wear 0.030 in (0.762mm)
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Do Not Reface Beyond 0.970 in (24.6mm)
All brake rotors have a minimum thickness dimension cast into them. This dimension is the minimum wear dimension and not a refinish
dimension. Do not use a brake rotor that will not meet the specifications, after refinishing. Replace with a new brake rotor.
NOTE: 1 inch = 25.4mm, so if your micrometer measures in inches and the specified thickness on the disc is in millimeters, convert millimeters to
inches by dividing the specified number of millimeters by 25.4.
Example: Specification on disc is 17.8 mm.
Dividing 17.8mm by 25.4mm/in = 17.8/25.4 = 0.70 inches.