TM-9-2320-280-34 HMMWV Direct Support & General Support Maintenance Manual Download
Page 523 of 1258
10-3. BRAKE ROTOR REPAIR INITIAL SETUP: Tools ____ General mechanic’s tool kit: automotive (Appendix G, Item 1) Dial indicator (Appendix G, Item 95) Micrometer (Appendix G, Item 96) Materials/Parts _____________ Abrasive crocus cloth (Appendix B, Item 10) Manual References _______________ TM 9-2320-280-20 TM 9-2320-280-24P Equipment Condition _________________ Brake rotor removed (TM 9-2320-280-20). Maintenance Level _______________ Direct support This task covers: a. Inspection c. Checking Thickness Variation b. Checking Lateral Runout d. Refinishing NOTE If rotor braking surfaces are rusted or scaled, they must be cleaned before attempting inspection or measurement. 1. Mount rotor (1) in brake lathe and turn while cleaning surfaces with abrasive crocus cloth. 2. Inspect rotor (1) for heat cracks, nicks, broken cooling fins (2), scoring, discoloration, and pitting. Replace if damaged. 1. Mount dial indicator with stylus contacting rotor (1) surface 1 in. (25 mm) in from outer edge. 2. Turn rotor (1) 360° and note indicator reading. 3. If lateral runout exceeds 0.004 in. (0.10 mm) total, replace or refinish rotor. 1. Measure thickness variation of rotor (1) with a micrometer at four equally-spaced points around rotor (1). Measure 1 in. (25 mm) in from outer edge. NOTE Rotor must be replaced if minimum thickness falls below 0.81 in. (20.6 mm). For the A2 and M1123 vehicles, rotor must be replaced if minimum thickness falls below 0.97 in. (24.6 mm). 2. If thickness variation exceeds 0.005 in. (0.13 mm), replace or refinish rotor (1). 1. Mount rotor (1) on brake lathe and refinish surface. 2. Replace rotor (1) if refinishing causes rotor (1) to fall below minimum thickness, 0.81 in. (20.6 mm) or 0.97 in. (24.6 mm) for A2 and M1123 vehicles. d. Refinishing c. Checking Thickness Variation b. Checking Lateral Runout a. Inspection TM 9-2320-280-34 10-2 Change 1