Delco Moraine Powermaster

The Powermaster unit is a complete, integral power brake apply system. It consists of an electro-hydraulic pump, fluid accumulator, pressure switch, fluid reservoir, and a hydraulic booster with an integral dual master cylinder.

The nitrogen charged accumulator stores fluid at 510-675 psi for hydraulic booster operation. The pump operates between pressure limits only with ignition on. When pressure switch senses accumulator pressure below 510 psi, 12-volt pump operates to increase accumulator fluid pressure to 675 psi. The accumulator must be depressurized whenever servicing brake system.

When the brake pedal is depressed, fluid from the accumulator acts on the booster power piston to apply the master cylinder which functions in the same manner as a conventional dual master cylinder.