Brake Drum: Testing and Inspection

INSPECTION





- Maximum inner diameter: 296.5 mm (11.67 inch)
- Out-of-roundness: 0.03 mm (0.0012 inch)
- Contact surface should be fine finished with No. 120 to 150 emery paper.
- Using a drum lathe, lathe brake drum if it shows scoring, partial wear or stepped wear.
- After brake drum has been completely reconditioned or replaced, check drum and shoes for proper contact pattern.