JEGS Electric Brake Booster and Master Cylinder Combo

Stopping Power

JEGS Electric High Power Brake System looks great, is designed for easy installation, and performs even better. The master cylinder’s polished finish looks great mounted on the firewall of any street rod, classic, muscle car, or hot rod. The electric booster system requires no engine vacuum, can be mounted almost anywhere, and is perfect for vehicles with aggressive camshafts, superchargers, and turbochargers.


JEGS 631250 [Disc/Disc] Electric Brake Booster and Master Cylinder Combo has a beautiful polished aluminum finish and is the perfect solution for vehicles with low engine vacuum, such as engines with large lift camshafts or boosted engines with turbos or superchargers. Its versatile and compact booster design measures 7 in. L x 5 in. W x 8 in. H and allows you to mount it almost anywhere. They tell us, “Our combo is the perfect upgrade for classics, muscle cars, street rods, and other vehicles where limited space is an issue.”
The integral relay and pressure switch comes pre-wired, requiring only a ground, 12-volt battery connection, and keyed ignition connection. Its whisper-quiet power booster unit draws only 14 amps at max pressure and is quieter than most performance electric fuel pumps.
JEGS designed this system for the do-it-yourselfer with performance and safety in mind. The company uses a 1 3/16 in. bore master cylinder to provide plenty of fluid for even the most complex braking systems with multi-piston calipers while still creating 1600-1800 psi brake line pressure during regular operation and over 2000 psi at maximum output.
The booster circuit incorporates a hydraulic accumulator ball which works like a capacitor does in an electrical circuit. This ball stores up pressure that allows for a very smooth actuation of the brakes and provides additional reserve pressure to assist the brakes in the event of a failure of the vehicle’s electrical system. The built-in safety reserve will give you 10-15 full-assist stops before the pedal slowly starts to get firm as the pressure drops in the boost circuit. If you get to zero pressure in the booster circuit, you will then have manual brakes.
This Electric Brake Booster and Master Cylinder Combo meets O.E.M. (Original Equipment Manufacturer) standards and JEGS recommends using DOT5 silicone-based brake fluid. If you are adding this to an existing system, DOT3 or DOT4 brake fluid will work fine.

JEGS 631250 Features:

• Universal fit – Bolts on to most American cars using a 2 bolt 3 1/16 in. – 3 7/16 in. center line
• Master Cylinder is compact at 9 in. Long and 3 1/2 in. Wide with 1 3/16 in. bore and is compatible with most brake calipers including stock, 4 piston, and 6 piston models
• Replaces bulky vacuum boosters, improves valve cover clearance
• No vacuum pump or belt-driven pump required
• Powered by a 12V Electric Pump that can be remotely mounted Out of Sight
• The pump can be mounted in any orientation
• PSI Operational range 1,600 to 2,500 PSI for easy modern braking


JEGS High Performance logo


JEGS High Performance






(800) 345-4545


751 E 11th Ave.

Columbus, OH 43211

ABOUT JEGS High Performance®

JEGS High Performance sells performance auto parts, aftermarket accessories, tools, and race apparel. JEGS was founded by Jeg Coughlin Sr. in 1960 as a small speed shop. JEGS is still family owned and operated, but has expanded to include a massive 250,000-square-foot warehouse, approximately 350 employees, two mail-order facilites, a retail store and a race team (Team JEGS). Team JEGS is currently one the most successful teams in U.S. drag racing, with more than 100 victories at the national, divisional and local levels. And JEGS Foundation Racing for Cancer Research program has raised several million dollars.