Depressurizing Powermaster III

The Powermaster III must be depressurized prior to performing any service operations.
1. Turn ignition switch to the Off position, or disconnect negative battery cable.
2. Firmly apply, then release the brake pedal a minimum of 40 times. A noticeable change in pedal feel (from soft to hard), will occur when accumulator is completely discharged.
3. Do not turn ignition switch to the On or Start position after depressurizing Powermaster III, unless instructed by service procedure, or until service operations have been completed.