DE-Pressurizing Hydraulic Accumulator

The pump/motor assembly will keep the hydraulic accumulator charged to a pressure between approximately (11,032 and 13,790 kpa) 1600 and 2000 psi any time that the ignition
is in the ON position. The pump/motor assembly cannot run if the ignition is off or if either battery cable is disconnected.

Unless otherwise specified, the hydraulic accumulator should be depressurized before disassembling any portion of the hydraulic system. The following procedure should be used to relieve the pressure in the hydraulic accumulator:

(1) With ignition off, or battery negative cable disconnected, pump the brake pedal a minimum of 40 times, using approximately 222 N (50 lbs.) pedal force. A noticeable change in pedal feel will occur, when the accumulator is discharged.

(2) When a definite increase in pedal effort is felt, pump pedal a few additional times. This will remove all hydraulic pressure from the system.