TM  10-3930-638-24&P 2-41. BRAKE SYSTEM TROUBLESHOOTING (cont) MALFUNCTION TEST  OR  INSPECTION CORRECTIVE ACTION 8. EXCESSIVE SERVICE BRAKE PEDAL EFFORT REQUIRED (cont) Step 2. Check brake pedal/return spring linkage for binding, interference, missing parts, or damage (para 2-43e). a. If brake pedal/return spring linkage is binding, has interference, is missing parts or damaged, repair or  replace  (para  2-43e). b. If brake pedal/return are okay, proceed to step 3. Step 3.       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 in- jured 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 4. Step 4. Check brake linings for wear, glaze, and excessive dust (para 2-43a). a. Replace brake linings if worn, or glazed; remove excessive dust (para 2-43a). b. If brake linings are okay, reinstall hub and drum assemblies, axle shafts (para 2-39f), lower axle and wheels to ground, remove shipping lock pin (store under operator’s seat) and remove blocks from wheels. Proceed to step 5. Step 5.  Operate all control levers several times with engine off to relieve hydraulic pressure. Depress service brake  pedal  and  note  pedal  effort  required.  Start  engine,  depress  service  brake  pedal  and  note  pedal effort  required. a. If required pedal effort is the same with engine off or on, proceed to step 6. b. If less pedal effort is required with engine running, proceed to step 7. CHANGE   2-267