Brake Drum
Brake Drum Specs| 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) | 0.090 mm (0.004 in.) |
| Drum Runout (on lathe) | 0.15 mm (0.006 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.) |