TM 10-3930-659-34 4-51. SERVICE BRAKE DISC REPLACEMENT (Con’t). 7. Install brake backing plate (5) on ring gear (4) with three dowel pins (6). 8. Position ring gear (4) on axle housing (3). 9. Install pinion shaft (2) in axle housing (3). 10.  Install service brake disc (1) on pinion shaft (2) and brake backing plate (5). FOLLOW-ON TASKS: • Install axle housing assembly (see paragraph 4-50). • Remove frame locking bar (see TM 10-3930-659-10). TA708316 4-191