TM 1-1520-238-233-2513.63.BRAKE CONTROL VALVES INTERNAL LEAKAGE REPAIR AND TEST (AVIM) – continuedWARNINGPiston is spring loaded. Remove capcarefully to prevent injury to person-nel. If injury occurs, seek medical aid.b. Disassemble piston (6).(1) Hold piston (6). Remove hydraulic valve cap(8).(2) Remove disk (10), valve poppet (9), and com-pressed helical spring (11) from piston (6).(3) Discard disk (10).c. Remove hydraulic bleeder valve (12) fromvalve (2).(1) Hold valve (12). Remove screw (13) and lockwasher (14).(2) Remove bleeder valve (12) from valve (2).3.63.4. Cleaninga. Clean valve and valve components (para 1.47).3.63.5. Inspectiona. Check poppet seating surface on cap fornicks and scratches. None allowed.b. Check that diameter of piston is not less than1.497 INCHES and piston bore is not morethan 0.406 INCHES. Use caliper set and smallhole gage.c. Check spring (5) and spring (11) for freelength, compressed length, and load withspring tester (Table I). Usespring tester.d. Check piston and valve for corrosion (para1.49).GO TO NEXT PAGE8911106M04-2949-22M04-2949-3131412M04-2949-5FREE LENGTH1111SPRINGTESTERM04-2949-4FREE LENGTH55SPRINGTESTER
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