POWERWORKS PV4 Brake Proportioning Valve for Disc/Disc Systems — Brass, Universal Mounting

If your vehicle experiences rear-wheel lockup or uneven braking feel with a disc/disc setup, the PV4 proportioning-combination valve offers a compact, reliable solution. Made from corrosion-resistant brass and engineered for flexible mounting, this universal valve is built to interface with standard master cylinder and caliper plumbing while fine-tuning front-to-rear brake pressure distribution.

How does the PV4 improve braking balance?

The PV4 reduces the risk of rear brake lockup by adjusting the hydraulic pressure routed to the rear circuit relative to the front. By proportioning pressure correctly it helps the front and rear brakes engage more predictably under heavy braking, improving controllability.

• Proportioning action calibrated for disc/disc systems
• Reduces rear wheel lockup tendencies under hard stops
• Works inline with existing master cylinder and lines

What connections and fittings does this valve use?

The PV4 includes five threaded ports to attach to the master cylinder, front and rear brake lines, and parking brake or auxiliary lines if needed. Thread sizes match common automotive standards so installation integrates easily with most classic trucks, muscle cars, and late-model vehicles using disc brakes front and rear.

• Rear brake port: 9/16"-18
• Front brake ports: dual 3/8"-24
• Master cylinder inlets: 1/2"-20 and 7/16"-24

Where and how can the PV4 be mounted?

The PV4 is designed for flexible mounting orientation — left, right or bottom — so it fits a wide variety of engine bays and chassis layouts. Its compact brass body allows installers to position the valve for convenient line routing and accessibility for maintenance.

• Mount left, right or bottom to suit vehicle geometry
• Compact brass housing for tight spaces
• Accessible ports for straightforward hose fitting and bleeding

What materials and durability can I expect from this valve?

Constructed from high-quality brass, the PV4 offers strong resistance to rust and corrosion compared with some steel-bodied alternatives. Brass also provides stable thermal conductivity and long service life under normal road conditions when installed and maintained properly.

• Solid brass construction to resist corrosion
• Durable threads sized to industry norms
• Supplied as a single piece for direct replacement or retrofit

Who is this for: The POWERWORKS PV4 is aimed at mechanics, restoration builders, and car enthusiasts upgrading or troubleshooting disc/disc brake systems on classic trucks, muscle cars, and many modern vehicles. If your setup needs a universal, serviceable proportioning/combination valve to refine rear-to-front brake balance and reduce lockup risk, the PV4 provides a straightforward, brass-bodied solution that integrates with standard brake plumbing.