TM 10-3930-659-20 10-16.    ACCUMULATOR-TO-ACCUMULATOR CROSSOVER LINE REPLACEMENT. This task covers: a. Removal b. Installation INITIAL SETUP: Equipment Conditions: Materials/Parts: •    Parking brake set (see TM 10-3930-659-10). • Two performed packings •    Frame locking bar installed (see TM 10-3930- 659-10). References: •    Left side cab skirt removed (see paragraph 14-6).•    TM 103930-659-10 Tools/Test Equipment: • General mechanic's tool kit (Item 44, Appendix F) a. REMOVAL WARNING Pressure  stored  In  accumulator  Is  approximately  500  psi  (3448  kPa).    Ensure that accumulator pressure Is relieved before removing service brake hoses or components.    Failure  to  follow  this  warning  may  result  In  serious  Injury  or death to personnel. NOTE •  It  Is  necessary  to  hold  boot  of  one  brake  pedal  with  hand  while  opposite brake  pedal  Is  pumped.    Movement  Inside  boot  will  be  felt  as  opposite  brake pedal is pumped. Accumulator pressure is relieved when movement stops. • Each brake pedal should be pumped a full 75 times even if no movement is felt after pumping brake pedal several times. 1. Hold  boot  (3)  of  left  brake  pedal  (4)  with  hand and   pump   right   brake   pedal   (1)   75   times. Release boot. 2. Hold boot (2) of right brake pedal (1) with hand and    pump    left    brake    pedal    (4)    75    times. Release boot. TA706961 10-47