TM 10-3930-659-20 6-36. LOW BRAKE PRESSURE SWITCH REPLACEMENT. This task covers: a. Removal b. Installation INITIAL SETUP: Equipment Conditions: Tools/Test Equipment: •    Battery disconnect switch in OFF position (see • General mechanic's tool kit (Item 44, Appendix F) TM 10-3930-659-1 0). References: •    Left side cab skirt removed (see paragraph 14-6). TM 10-3930-659-10 NOTE Right  and  left  low  brake  pressure  switches  are  removed  and  Installed  the same way except right low brake pressure switch has three under cab wiring harness  connectors  and  left  low  brake  pressure  switch  has  two  under  cab wiring harness connectors.  Left low brake pressure switch is Illustrated. 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.        Accu- mulator   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. 6-136