TM 10-3930-653-14&P INSPECTION Inspect all parts for defects and repair or replace if unsatisfactory. (1) Check  the  inner  surface  of the wheel cylinder and   the   outer   circumference   of   the   piston   for rust.  Then  measure  the  clearance  between  the piston and cylinder. Standard: 0.065-0.15 mm (0.0026-0.0059 in) Limit: 0.15 mm (0.0059 in) Fig.  4-455. (2) Visually check the piston cup for damage or deformation.  If unsatisfactory, replace. Cup interference standard: 1.49 mm (cup o.d.  of 30.1 mm) [0.059 in (cup o.d.  of 1.19 in)] Cup interference limit: 0.65 mm (cup o.d.  of more than 29.0 mm) [0.026 in (cup o.d.  of more than 1.14 in)] (3) Check the free length of the wheel cylinder spring.  If unsatisfactory, replace. Specified free length: 28.58 mm (2.28 in) (4) Check the thickness of brake lining. If excessive wear is noticed, replace. Specified thickness: 8.0 mm (0.32 in) Thickness limit: 1.0 mm (0.039 in) (5) Visually  check  the  condition  of  the  brake  drum inner surface.  If any damage or excessive wear is noticed, repair by machining or replace. Standard: 314 mm (12.36 in) Repair limit: 316 mm (12.44 in) Fig.  4-456. Fig.  4-457. 4-230

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