Wilwood 260-8419 Adjustable Proportioning Valve – Compact Knob Type

The Wilwood 260-8419 Adjustable Proportioning Valve is a compact, high-strength braking solution designed to deliver precise rear brake pressure control in performance street, track, and racing applications. Built from a forged billet aluminum body with steel internal components, this next-generation Wilwood valve provides unmatched pressure metering accuracy in a lightweight and space-efficient design.

With an adjustable pressure range from 150 to 1200 PSI and the ability to reduce line pressure by up to 57%, this valve offers the greatest pressure reduction of any proportioning valve currently available. The fine-thread adjustment knob allows for smooth, precise tuning to dial in optimal brake bias for varying vehicle setups, tire combinations, and track conditions.

Key Features & Benefits

• Adjustable brake pressure range from 150–1200 PSI

• Maximum line pressure reduction of up to 57%

• Compact forged billet aluminum body for strength and durability

• Fine-thread adjustment knob for precise, repeatable tuning

• Lightweight design weighing only 5.2 ounces

• Clear anodized finish for corrosion resistance

• Ideal for street performance, track day, and racing brake systems

Technical Specifications

• Material: Aluminum / Steel

• Finish: Clear Anodized

• Adjustment Rate: 0–57%

• Inlet Port Size: 1/8-27 NPT

• Outlet Port Size: 1/8-27 NPT

• Fitting Type:

  • Inlet: 3/8-24 Inverted Flare (Female)

  • Outlet: 3/8-24 Inverted Flare (Female)

• Mounting:

  • (2) Side mounting holes

  • Hole diameter: 0.25 in

  • Hole spacing: 1.00 in center-to-center

Included Components

• Wilwood Adjustable Proportioning Valve (Compact Knob Type)

• (2) 1/8-27 NPT to 3/8-24 inverted flare female fittings

• Pre-assembled and ready for installation

Vehicle Fitment

• Universal Fit

• Compatible with most vehicles using 3/16 in hard brake lines

• Designed for use in custom brake systems, race cars, and performance builds

• Professional installation recommended for proper brake system setup and safety

Additional Notes

• Intended for performance and off-road/racing applications

• Brake system modifications may not be legal for street use in all regions

• Always verify brake bias settings after installation