TM  10-3930-638-24&P 2-41.   BRAKE   SYSTEM   TROUBLESHOOTING   (cont) MALFUNCTION TEST  OR  INSPECTION CORRECTIVE ACTION 7. EXCESSIVE SERVICE BRAKE PEDAL TRAVEL (cont) Step 2. Check hydraulic brake valve for damage/leaking condition (para 2-43c). a. If hydraulic brake valve is damaged or leaking, repair or replace it (para 2-43c). b. If hydraulic brake valve is okay, proceed to step 3. Step 3. Check brake lines and connections between hydraulic brake valve and wheel cylinders for brake fluid leaks  (para  2-43b). a. If connections are leaking fluid, tighten; if brake lines are leaking fluid, replace (para 2-43b). b. If brake lines and connections are okay, proceed to step 4. Step  4. Place blocks (6 by 6 by 18 inches wood blocks) at each wheel to prevent vehicle from moving. Remove  shipping  lock  pin  from  storage  area  under  operator’s  seat  (para  2-4b(1))  and  install  in  chassis. Ensure that parking brake is applied. WARNING Before raising axle off ground, be sure that shipping lock pin is installed. Failure to do so may cause vehicle to turn and slip off jack or jack stands causing serious injury or death. If you are injured by falling equipment, obtain medical aid immediately. Raise one axle and wheels from ground. Remove  both  axle  shafts  and  hub  and  drum  assemblies  (para  2-39f). Check wheel cylinders for leaking condition or sticking piston (para 2-43a, step 1). Repeat  for  other  axle  and  wheels. a. If wheel cylinder is leaking or piston is sticking, replace wheel cylinder (para 2-43a). b. If wheel cylinder is okay, proceed to step 5. Step 5. Check brake linings for excessive wear (para 2-43a). a. If brake linings are worn excessively, replace (para 2-43a). b. lf brake linings are not worn excessively, adjust brakes (para 2-43a). 8.  EXCESSIVE  SERVICE  BRAKE  PEDAL  EFFORT  REQUIRED Step  1. Check  brake  lines  and  connections  between  hydraulic  brake  valve  and  wheel  cylinders  for  brake  fluid leaks  (para  2-43b). a. If connections are leaking fluid, tighten; if brake lines are leaking fluid, replace (para 2-43b). b. If brake lines and connections are okay, proceed to step 2. 2-266

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