Brake Drum Refinishing Specifications
Brake Drum Specifications| DRUM DIAMETER (Maximum) 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 in outer surface of drum |
| DRUM RUNOUT (on lathe) | 0.1524 mm (0.006 in.) |
| DRUM DIAMETER VARIATION | 0.0635 mm (0.0025 in.) in 30 degrees |
| 0.0889 mm (0.0035 in.) in 360 degrees | |
| 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.) |