S15/T15 Jimmy 2WD V6-4.3L VIN W (1998)
Brake Drum: Service and Repair
Brake Drum Refinishing (Refinishing)
When refinishing a drum, remove only enough metal in order to obtain a true, smooth braking surface. If the drum does not match specifications after
being refinished to the maximum refinish diameter, replace the drum. Refer to Component Specifications. Removal of more metal affects heat
dissipation. This will cause brake drum distortion.
All brake drums have a maximum diameter. This is not a refinish diameter. Do not refinish a brake drum that will not meet the specifications. Replace
the brake drum. Refer to Component Specifications.
When you refinish a brake drum, resurface the drum to a dimension no more than 0.76 mm (0.030 inch) less than the discard diameter. The refinish
diameter is the maximum diameter the drum can be refinished to and still allow safe braking action. If you exceed this diameter, the brake drum will
wear beyond the discard diameter during normal brake wear.
Always use sharp cutting tools or bits. Dull or worn tools leave a poor surface finish. A poor surface finish will affect initial braking performance.
Always use vibration dampening attachments when you refinish braking surfaces. These attachments eliminate tool chatter so that you can obtain a better
surface finish. A spindle speed of 150 RPM is the best speed for refinishing braking surfaces. Crossfeed for rough cutting should range from 0.15 - 0.25
mm (0.006 - 0.010 inch) per revolution. Make finish cuts at crossfeeds no greater than 0.05 mm (0.002 inch) per revolution.
NEW REPLACEMENT DRUM REFINISHING
Do not refinish the braking surface when installing new brake drums. These parts already are at the correct level of surface finish.
BALANCE
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Manufacturers use weights to balance brake drums.
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Do not remove these weights.
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Check the drums for balance in the following situations:
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After refinishing the brake drums
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When maintaining wheel balance is difficult
Check the drums on off-vehicle balancers. Replace the drum if it is out of balance.
