POWERWORKS PV4 Brake Proportioning Valve — Brass 5-Port Disc/Disc, Adjustable Mounting for Front/Rear Balance

POWERWORKS PV4 is a universal brass combination proportioning valve designed for disc/front and disc/rear brake systems to balance brake pressure and reduce rear-wheel lockup.

This PV4 Brake Proportioning Valve by POWERWORKS is a five-port combination valve engineered to fit most vehicles that run disc brakes front and rear. Made of durable brass, the valve accepts multiple master-cylinder and brake line fittings, and can be mounted left, right or bottom for flexible installation. It provides proportional pressure distribution between front and rear circuits so the rear brakes receive appropriate force under braking, helping to minimize the chance of rear-wheel lock during heavy stops.

How does the PV4 valve prevent rear brake lockup?

The PV4 moderates hydraulic pressure between front and rear circuits so the rear calipers do not receive excessive force compared with the front. When braking force ramps up, the built-in proportioning function reduces rear line pressure relative to the front, improving balance and stability during hard stops. This is a mechanical solution that works across many vehicle setups without electronic control.

• Five-port design separates front and rear braking circuits.
• Proportioning action reduces rear pressure under heavy braking.
• Works continuously without power—purely hydraulic operation.
• Helps maintain vehicle control during sudden deceleration.

What fittings and connection sizes does the PV4 use?

The POWERWORKS PV4 includes standard thread sizes to match common brake plumbing. Rear brake connection uses a 9/16"-18 port while the front brake lines attach to dual 3/8"-24 ports. Master cylinder feed lines connect via 1/2"-20 and 7/16"-24 ports, covering many aftermarket and OEM configurations.

• Rear brake port: 9/16"-18 thread for compatibility with standard fittings.
• Front brake ports: two 3/8"-24 ports for dual front circuits.
• Master cylinder inlets: 1/2"-20 and 7/16"-24 for common MC outputs.
• Threaded ports accept standard brake fittings and adapters when needed.

How is the PV4 mounted and installed on a vehicle?

The PV4 is built for flexible mounting: it can be installed on the left, right, or bottom depending on space and line routing. Its compact brass body resists corrosion and handles brake-fluid exposure, while the five ports let you configure the plumbing for your vehicle’s layout. Installation typically requires basic brake-line tools and proper bleeding after plumbing to remove air from the system.

• Mount options: left, right or bottom to fit tight engine bays.
• Brass body offers corrosion resistance and good thermal conductivity.
• Requires flare wrenches, line adapters if needed, and brake bleeding.
• Sold as a single PV4 unit—includes one brass combination valve.

Will this PV4 work on classic trucks and muscle cars?

Yes—the PV4 was designed with compatibility in mind for many classic trucks, muscle cars, and modern vehicles that use disc brakes on both axles. Its common thread sizes and universal mounting make it a practical retrofit option when upgrading or maintaining disc/disc brake setups. Verify thread sizes and line orientations before purchase to ensure a direct fit or to identify needed adapters.

• Ideal for older vehicles converting to or already using disc/disc brakes.
• Works with many aftermarket master cylinders and brake line kits.
• Can be adapted with common fittings if exact threads differ.
• Durable brass construction suits long-term use in varied conditions.

Who is this for: The POWERWORKS PV4 Brake Proportioning Valve is intended for car enthusiasts, restorers, mechanics, and DIYers who need a reliable mechanical solution to balance hydraulic pressure in disc/disc brake systems. It suits projects ranging from classic truck and muscle-car restorations to custom builds and routine brake upgrades where consistent rear pressure reduction and flexible mounting are required. If you’re unsure about fitment, check your master-cylinder outlet and brake line thread sizes or consult a qualified technician before installation.