Adj Proportioning Valve Lever Style

The Wilwood Adj Proportioning Valve Lever Style is a critical brake system component designed for builders and technicians who demand precise hydraulic pressure control. Whether you're developing a custom brake circuit, fine-tuning a high-performance application, or retrofitting proportioning capability into a classic vehicle, this adjustable valve lets you dial in the exact pressure balance needed for your specific setup. Proportioning valves are essential for preventing rear-wheel lockup during hard braking, ensuring front-to-rear brake force is properly balanced across your vehicle's weight distribution and brake configuration.

Built from clear anodized aluminum, this lever-type proportioning valve features dual 1/8 in NPT female ports for both inlet and outlet connections, allowing seamless integration into standard brake line installations. The adjustable design covers a 100–1000 psi operating range, giving you the flexibility to match your proportioning ratio to disc-to-drum brake combinations, different brake pad compounds, or custom hydraulic architectures. The lever actuation mechanism provides intuitive, manual adjustment without the complexity of screw-valve designs, making in-vehicle tuning and circuit diagnostics faster and more accessible for street and track applications alike.

This valve is ideal for custom brake installations, race car builds, and restoration projects where OEM proportioning systems don't suit your modified brake geometry or pressure requirements. Technicians working on front-rear bias adjustments or transitioning from mechanical to fully hydraulic brake systems will appreciate the compact, durable construction and NPT thread compatibility with most aftermarket brake distribution blocks and master cylinders. Weighing just 0.49 lbs and measuring 6.1 x 1.2 x 7 inches, it fits easily into tight engine bays and brake tunnel layouts. For maximum stopping performance and control, pair this adjustable proportioning valve with quality brake lines, metering valves, and a properly sized master cylinder matched to your pad and rotor selection.