Wilwood Adjustable Proportioning Valve
WIL260-8419
The Wilwood Adjustable Proportioning Valve is engineered for pressure adjustment that is smooth and repeatable, allowing fine tuning from full system pressure down to a maximum 57% reduction, making it ideal for dialing in rear brake bias on custom and high-performance builds.
Constructed from a forged billet aluminum body, the valve benefits from optimized grain flow forging that realigns the alloy’s grain structure for improved strength, tighter machining tolerances, and superior resistance to deflection under high pressure. Compared to traditional block-machined billet valves, the forged design achieves greater strength with less material, resulting in a lighter, smaller, and easier-to-mount valve.
Includes:
- (1) Wilwood Adjustable Proportioning Valve
- (2) 1/8"-27 NPT to 3/8"-24 inverted flare female brake line adapters
Specifications
- Manufacturer: Wilwood
- Valve Type: Adjustable Proportioning Valve
- Adjustment Range: 0–57% pressure reduction
- Effective Pressure Range: Approx. 100–1,000+ PSI
- Material: Aluminum / Steel
- Finish: Clear Anodize
- Weight: 5.2 oz
- Inlet Port: 1/8"-27 NPT
- Outlet Port: 1/8-"27 NPT
- Mounting Holes: (2) × 0.25" diameter
- Mounting Hole Spacing: 1.00" center-to-center
Fitment
- Compatible with disc and drum brake systems
- Designed for 3/16" hard brake lines (with included fittings)
- Suitable for street, off-road, drag racing, dirt track, and road race applications
- Compact body allows discreet or exposed mounting locations
Tech Insight
A proportioning valve is critical for balancing front-to-rear brake pressure, especially in vehicles with upgraded calipers, mixed brake setups, or altered weight distribution. Wilwood’s forged billet design allows this valve to withstand extreme line pressures while maintaining precise control. With up to 57% pressure reduction, it offers more adjustment range than most competing valves—making it easier to prevent rear brake lockup without sacrificing overall stopping power.
Adjustment Styles
Knob Adjustable
Infinitely adjustable with fine-thread control
Turn fully clockwise for full pressure
Rotate counterclockwise to progressively reduce output pressure
Lever Adjustable
Six detented positions for quick, repeatable changes
Lever at 90° (high cam) delivers full pressure
Step back one click at a time to reduce pressure incrementally