TM 10-3930-659-20 10-7. SERVICE BRAKE DISC INSPECTION. This task covers: Inspection Initial Setup. Equipment Conditions: Materials/Parts: • Parking brake set (see TM 10-3930-659-10). • One preformed packing Tools/Test Equipment: References: • General mechanic's tool kit (Item 44, • TM 10-3930-659-10 Appendix F) • Trestle, 7 ton (two) (Item 45, Appendix F) NOTE Front  and  rear  service  brake  discs  are  Inspected  the  same  way except front axle has two plugs and rear axle has one plug.  Front service brake disc is illustrated. INSPECTION 1. Raise    forks    (see    TM    10-3930-659-10)    and position two trestles under carriage.  Lower forks onto trestles. 2. Remove   plug   (1)   and   preformed   packing   (2) from     differential     (3).          Discard     preformed packing. 3. Measure    thickness    of    brake    linings    (4)    on pressure  plate  (6)  and  brake  backing  plate  (5). Measurement  must  not  be  'less  than  0.040  in (1.016   mm).      If   measurement   is   less   than specified,   pressure   plate   and   brake   backing plate  must  be  replaced.    Notify  Direct  Support Maintenance 4. Install  plug  (1)  and  new  preformed  packing  (2) on differential (3). 5. Raise forks (see TM 10-3930-659-10) and remove two trestles from under carriage.  Lower forks to ground (see TM 10-3930-659-10). TA706942 10-20