buick Workshop Repair Guides

Buick Workshop Service and Repair Manuals

Depressurizing Powermaster III (with ABS)|Page 4619 > < Cylinder Bore Diameter|Page 4616
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Brake Master Cylinder: Service and Repair
Depressurizing Powermaster III (with ABS)

    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.

Depressurizing Powermaster III (with ABS)|Page 4619 > < Cylinder Bore Diameter|Page 4616