Envoy 4WD V6-4.3L VIN W (1998)
Brake Drum: Service and Repair
Brake Drum Refinishing (Tapered)
An out-of-round or tapered brake drum can cause the following symptoms:
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Inaccurate brake shoe adjustment
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Excessive wear on other brake parts because of eccentric action
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Severe and irregular tire tread wear
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Pulsing brake pedal
Out-of-round and taper can be measured accurately with an inside micrometer and extension rods.
1. Measure the drum inside diameter at the inner edge of the machined braking surface.
2. Measure the drum inside diameter at the outer edge of the machined braking surface.
3. Record the measurements.
4. Repeat steps 1 and 2 at two or more places around the drum.
5. When the brake drum exceeds the specification limits in taper and/or out-of-round, refinish the drum.
