Brake Proportioning Valve Adjustable

The Brake Proportioning Valve Adjustable (R4515) from RACING POWER CO-PACKAGED is an essential component for any serious brake system builder or restoration enthusiast who demands precise pressure control across front and rear braking circuits. This proportioning valve is purpose-built for custom hydraulic brake installations where factory bias settings don't match your performance needs—whether you're upgrading to larger rotors, changing tire sizes, or tuning a modified suspension geometry. Available for sale as a critical upgrade for street rods, race cars, and high-performance street vehicles, this valve gives you the fine-tuning capability that factory fixed-ratio proportioning cannot provide.

Constructed from durable aluminum and finished in polished chrome, the Brake Proportioning Valve Adjustable features a knob-style adjustment mechanism that allows real-time bias tuning without breaking apart the hydraulic circuit. Both inlet and outlet ports are 3/8-24 inch female NPT fittings, providing industry-standard compatibility with common brake line adapters and master cylinder outputs. The adjustable design lets you dial in the perfect rear-to-front pressure ratio, preventing rear wheel lockup under hard braking while maintaining adequate stopping power—a critical balance that changes with payload, tire compound, and suspension setup. Weighing just 1.05 pounds and measuring 7.75 x 1.25 x 8.75 inches, it integrates cleanly into tight engine bays without occupying excessive real estate.

This proportioning valve is ideal for enthusiasts who have already outgrown fixed-ratio proportioning and need the flexibility to dial in correct brake balance as they modify suspension geometry or upgrade brake components. Installation is straightforward for anyone comfortable working with brake hydraulics: thread the inlet line from your master cylinder and outlet lines to your rear brake circuits, then adjust the knob while test-driving to find the sweet spot where both axles approach lockup simultaneously. Whether you're building a custom hot rod, tuning a track-focused street machine, or restoring a classic with modern stopping power, this adjustable valve provides the control and precision that separates a safe, confidence-inspiring brake system from a marginal one. Review specifications carefully to confirm 3/8-24 port compatibility with your existing brake lines and fittings before purchase.