Adj. Proportioning Valve Knob Style 3/8-24 IF

The Wilwood Adj. Proportioning Valve Knob Style 3/8-24 IF is a precision brake system component engineered for custom vehicle builds and high-performance brake line applications. This adjustable proportioning valve gives builders and mechanics direct control over brake pressure distribution, making it essential for vehicles running aftermarket brake systems, custom suspension setups, or significantly altered weight distributions. Whether you're installing a front-disc rear-drum conversion, upgrading to a modern brake setup on a classic, or fine-tuning a track-focused performance vehicle, this Wilwood proportioning valve delivers the pressure modulation your system demands.

Constructed from clear anodized aluminum, the Adj. Proportioning Valve features a knob-style adjustment mechanism that allows real-time pressure tuning from 150 to 1200 psi—a range broad enough for everything from street cars to race vehicles. The 3/8-24 inverted flare female inlet and outlet ports accept standard automotive brake line fittings, ensuring seamless integration into existing or new brake systems. The proportioning valve's primary function is to meter hydraulic pressure to the rear brakes relative to the front circuit, preventing rear wheel lockup during hard braking and maintaining balanced stopping power across all four wheels, a critical safety and performance feature that direct adjustment provides.

This component is ideal for fabricators, restoration shops, and serious enthusiasts building custom brake systems where one-size-fits-all valve limitations don't apply. Installation requires positioning the valve in the rear brake circuit, typically between the master cylinder proportioning port and the rear wheel cylinders or calipers, with the knob accessible for adjustment. Proper tuning involves brake testing and gradual adjustment until you achieve balanced front-to-rear stopping without rear lockup; Wilwood's adjustable design makes this calibration straightforward. Compatible with 3/8-24 inverted flare brake line systems, this valve is a must-have for DIY builders and professional shops seeking precise brake balance control on custom or modified vehicles.