OEM Buick Century Brake Drum

Buick Century Brake Drum Parts and Q&A

• Brake Drum
  88957254
  Q: How should brake drums be serviced and repaired on Buick Century?

  A:

  Start Brake Drum work by cleaning the part while searching for cracks, scoring, severe groove marks, out-of-round shape, and taper. Normal light markings on the surface of a drum should not reach more than 0.51 mm (0.020 inch) in depth and will not impact the brake system. The presence of cracks in a drum requires replacement since welding the part creates safety hazards. All minor Brake Drum marks should be flattened by hand while extensive surface grooves need refacing during brake lining replacement to avoid unnecessary component wear. Brake Shoe adjustment may become imprecise while severe tread damage and a wobbling Brake Pedal result when the drum shows out-of-round or taper conditions. Take out-of-round and taper wear measurements at different right angles by placing the j22364-01 or a micrometer tool at the drum's open and closed edges with proper extension rods. Normal drum refinish ends when the metal reveals true and smooth surfaces. Replace the drum when you cannot reach the specified rebore diameter during cleaning. The maximum diameter stamp on brake drums shows the highest amount of wear but remains an unrefinishable size. Use sharp tools fitted with vibration dampers to reduce the drum dimension by no more than 0.76 mm (0.030 inch) before its discard diameter. To achieve excellent results when refinishing choose 200 rpm for the Spindle speed plus adjust the rough cutting cross feed from 0.25 to 0.15 mm (0.010 to 0.006-inch) each revolution and stem from making finish cuts deeper than 0.05 mm (0.002 inch) per revolution. Run the lathe while smoothing the surface after cutting by sanding the surface with 80 to 120 grit emery cloth. Check drum condition when wheel balancing becomes hard especially after refurbishment. Reinstall all balancing weights as given by the manufacturer.