Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSCHEVROLET1986CAPRICE WAGON V8-305 5.0LREPAIR AND DIAGNOSISBRAKES AND TRACTION CONTROLHYDRAULIC SYSTEMDESCRIPTION AND OPERATIONPOWERMASTER
1986 Chevrolet Caprice Wagon V8-305 5.0L
Powermaster
1986 Chevrolet Caprice Wagon V8-305 5.0LSECTION Powermaster
POWERMASTER BRAKE SYSTEM
The Powermaster unit is a complete, integral power brake apply system. It consists of an electro-hydraulic (EH) 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 PSIG for hydraulic booster operation. The E-H pump operates between pressure switch limits with the ignition "ON". When the pressure switch senses accumulator pressure below 510 PSIG, the 12-volt E-H pump operates to increase accumulator fluid pressure to 675 PSIG.
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.
Exploded View Of Powermaster Assembly:
The Powermaster unit is a complete, integral power brake apply system. It consists of an electro-hydraulic (EH) 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 PSIG for hydraulic booster operation. The E-H pump operates between pressure switch limits with the ignition "ON". When the pressure switch senses accumulator pressure below 510 PSIG, the 12-volt E-H pump operates to increase accumulator fluid pressure to 675 PSIG.
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.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.