POWERWORKS PV4 Proportioning Combination Valve for Disc/Disc Brakes — Brass 5-Port, Adjustable Mounting

The POWERWORKS PV4 is a universal brass proportioning combination valve engineered to balance hydraulic pressure between front and rear disc brakes and reduce rear-wheel lock-up.

This compact, service-ready valve is a five-port solution for vehicles fitted with disc brakes at both axles. Made from high-quality brass for corrosion resistance and thermal stability, the PV4 accepts common master cylinder and brake line fittings and can be mounted left, right or bottom to suit installation requirements. It’s intended for classic trucks, muscle cars and many modern vehicles that need simple, reliable proportional braking control without replacing the master cylinder.

How does the PV4 improve braking balance on disc/disc systems?

By altering hydraulic flow to the rear circuit, the PV4 reduces the chance of rear-wheel lock-up under heavy braking. The valve proportionally reduces rear pressure relative to the front, helping maintain stability during sudden stops while preserving front braking performance.

• Five-port combination design separates front, rear and master cylinder connections
• Calibrated internal passage reduces rear line pressure during firm braking
• Brass construction resists corrosion and conducts heat away from fluid passages

What fittings and mounting options does the valve support?

The PV4 includes common SAE-style ports to match many factory and aftermarket brake plumbing layouts. It is designed for flexible installation: left-side, right-side or bottom-facing mounts accommodate engine bay or frame constraints.

• Rear brake port: 9/16"-18
• Front brake ports: dual 3/8"-24
• Master cylinder ports: 1/2"-20 and 7/16"-24
• Multiple mounting orientations for ease of fitment

What vehicles will the POWERWORKS PV4 work with?

Designed as a universal solution, the PV4 fits a wide range of vehicles that use disc brakes on both axles. It’s especially useful on restored classics and custom builds where the original braking balance was tuned for drum rears or different fluid volumes.

• Classic trucks and muscle cars with upgraded disc brakes
• Custom builds that require a proportional valve without changing master cylinder
• Most disc/disc setups using the listed SAE fittings

How durable and serviceable is the PV4 assembly?

The body is machined from brass to provide long-term resistance to rust and to maintain dimensional stability under heat. Installation and replacement are straightforward; the valve mounts near existing brake lines and uses standard thread fittings so lines and adapters can be swapped without special tools.

• Solid brass body for corrosion resistance
• Standard thread sizes for easy plumbing integration
• Supplied as a single-piece unit ready for installation

Who is this for: The POWERWORKS PV4 is for mechanics, restoration enthusiasts and DIY builders who need a reliable, compact proportioning solution for disc/disc brake systems. If you’re tackling rear lock-up, upgrading brakes on a classic vehicle, or fitting a new master cylinder arrangement, this valve gives proportional control without complex hydraulic modifications. Contact POWERWORKS customer support if you need fitment guidance—parts are backed by the brand for quality and service.