TM 10-3930-675-20-1 0006 00-16 TROUBLESHOOTING PROCEDURES (NON-ERROR CODE) - CONTINUED 0006 00 Table 3. Brake System Troubleshooting Procedures (Non-Error Code). MALFUNCTION TEST OR INSPECTION CORRECTIVE ACTION 1.   Braking is Poor or Nonexistent. 1.  Ensure    that    brake    system accumulator shutoff valves are in closed position. Close  shutoff  valve  as  required (WP 0164 00). 2.  Inspect     brake     pedals     for damage and obstructions. a.  Remove any obstructions. b.  Repair   or   replace   damaged brake pedal (WP 0130 00). 3.  Check  hydraulic  brake  lines and   hoses   for   damage   and signs of leakage. a.  Tighten loose connections. b.  Replace  damaged  or  leaking lines and hoses (WP 0125 00). 4.  Test   operating   pressure   for brake system circuits 1 and 2 (WP 0186 00, test points no. 4 and   5).   Operating   pressure should  be  2523  psi  (174  bar) and with brake pedal depressed     pressure     should stabilize at 1450 psi (100 bar). a.  Replace brake charging valve (WP 0125 00). b.  Replace service brake control valve (WP 0124 00). c.  Notify   DS   Maintenance   to replace     boom     and     brake system pump. d.  Notify   DS   Maintenance   to perform   service   brake   pad measurement checks. 5.  Test accumulator pressure for brake system circuits 1 and 2 (WP 0186 00, test points no. 1 and 2). Accumulator pressure should be 2523 psi (174 bar). Notify     DS     Maintenance     to service accumulators. 2.   Parking Brake Will Not Release. 1.  Ensure    that    brake    system accumulator shutoff valves are in closed position. Close  shutoff  valve  as  required (WP 0164 00). 2.  Inspect  parking  brake  control lever for damage and obstructions. a.  Remove any obstructions. b.  Repair   or   replace   damaged parking   brake   control   lever (WP 0122 00). 3.  Check  hydraulic  brake  lines and   hoses   for   damage   and signs of leakage. a.  Tighten loose connections. b.  Replace  damaged  or  leaking lines and hoses (WP 0123 00). 4.  Test accumulator pressure for brake system circuits 1 and 2 (WP 0186 00, test points no. 1 and 2). Accumulator pressure should be 2523 psi (174 bar). Notify     DS     Maintenance     to service accumulators.