TM 10-3930-659-34 Table 3-1.  Troubleshooting (Con’t). MALFUNCTION TEST OR INSPECTION CORRECTIVE ACTION Step 2.   Inspect brake discs for wear and damage (see paragraph 4-51). Replace damaged brake discs (see paragraph 4-51). 22.  BRAKES DRAG OR CHATTER. Inspect brake discs for wear and damage (see paragraph 4-51). Replace damaged brake discs (see paragraph 4-51). Repair or replace sticking or damaged brake piston (see paragraph 4-51). 23.  HISSING NOISE WITH BRAKE PEDAL DEPRESSED AND ENGINE STOPPED. Inspect brake pistons for leakage by removing differential fill plug and checking for overfilled differential.  Apply service brakes and check for leakage from fill plug. Replace damaged brake piston seal (see paragraph 4-51). 3-12