Brake Drum Refinishing Specifications
Drum Brake Specs| Brake Drum Size (Standard) | 228.6 x 63.5 mm (9 x 2.5 in.) |
| Drum Diameter (MAX) This marking includes 0.76 mm (0.030 inch) for allowable drum wear beyond the recommended 1.52 mm (0.060 inch) of drum refacing. | Cast/stamped into outside surface of drum |
| Diameter Variation (MAX) | 0.076 mm (0.003 in.) |
| Drum Runout (on lathe) | 0.2 mm (0.008 in.) |
| Initial Drum Machining Cuts Initial machining cuts should be limited to 0.12 - 0.20 mm (0.005 - 0.008 in.) at a time as heavier feed rates can produce taper and surface variation. | 0.12 - 0.20 mm (0.005 - 0.008 in.) |
| Finish Drum Machining Cuts | 0.025 - 0.038 mm (0.001 - 0.0015 in.) |