DE-Pressurizing Hydraulic Accumulator

The ABS pump/motor assembly will keep the hydraulic accumulator charged to a pressure between approximately (11,032 and 13,790 kPa) 1600 and 2000 psi anytime 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 de- pressurized before disassembling any portion of the hydraulic system. The following procedure should be used to de-pressurize the hydraulic accumulator:

(1) With ignition off, or either battery cable disconnected, pump the brake pedal a minimum of 40 times using approximately 50 pounds of 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 the pedal a few additional times. This will remove all hydraulic pressure from the system.