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![Power Brake Unit Fits Select 1973-1987 Chevy/GMC Trucks, w/Aluminum Master Cyl. & Adj. Proportioning Valve, Black [Disc/Disc]](https://www.jegs.com/images/mini_750/500/555/555-631964.jpg)
Vehicle Info NeededJEGSPART NUMBER: 555-631964
Power Brake Unit Fits Select 1973-1987 Chevy/GMC Trucks, w/Aluminum Master Cyl. & Adj. Proportioning Valve, Black [Disc/Disc]
$51999$549.99You Save$30.00
Ships on 09/15/2026
Lowest Price GuaranteeGM Truck, Disc Front & Disc Rear
Power Brake UnitFits Select 1973-1987 Chevy & GMC Trucks See Fitment Tab for Applications Disc/Drum Includes:
- 8 in. Power Booster w/Brackets
- 1 1/8 in. Bore Alum. Master Cylinder
- Adjustable Proportioning Valve
- Pedal Rod
JEGS 555-631964 Power Brake Unit Features:
- Fits 1973-1987 Chevy & GMC Trucks
- Front Disc and Rear Disc Applications
- Black Powder Coated Aluminum 1 1/8 in. Bore Dual Reservoir Master Cylinder with Oval Cap
- Black Powder Coated 8 in. Dual Diaphragm Power Booster
- Power Booster Vacuum Port Connector
- Black Powder Coated Firewall Mounting Brackets
- Truck Pedal Rod Extension
- Adjustable Black Left Mount Proportioning Valve Kit
- Brake Warning Light Switch & Connector Pre-Bent Brake Lines & Bracket
- (5) 3/8 in.-24 Brake Fittings
Improve Your Stopping Distance with a Power Brake Conversion Kit
JEGS power brake conversion kits provide better stopping distance to increase vehicle safety by transforming your manual brakes into an improved power-assisted system. All power brake conversion kits include a master cylinder, power brake booster, mounting brackets, and other necessary components for easy installation. We offer several style options to meet your brake improvement needs.
Part TypeBrake Master Cylinder and Booster Assembly
Product LineJEGS Power Brake Booster Conversion Kits
BrandJEGS
Package Height10.4
Package Width11.4
Package Length15.5
Weight18.57 PG
Part CategoryReplacement Parts
Brake Booster FinishBlack Powder Coat
Brake Booster TypeDual Vacuum diaphragm
Master Cylinder FinishBlack Powder Coated
Mounting Hole Quantity4 holes
Brake Booster IncludedYes
Master Cylinder Bore Size1.125 in (28.575 mm)
Booster Mounting Bracket IncludedYes
QuantitySold as an Assembly
Mounting Hardware IncludedNo
Brake Booster Diameter8 in (203.2 mm)
Brake Pedal Rod Extension IncludedYes
Bowl DesignDual
Rear Brake TypeDisc
Brake Booster MaterialSteel
Master Cylinder MaterialAluminum
Master Cylinder Cap IncludedYes
Front Brake TypeDisc
Reservoir MaterialAluminum
Master Cylinder IncludedYes
Part FitmentSemi Universal
Reservoir IncludedYes
Package Qty1
Package TypeEA
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