Prop Valve Brass Style Each

The Prop Valve Brass Style Each (R4500) from Racing Power Co-Packaged is a proportioning valve engineered for disc and drum brake systems where balanced pressure distribution is critical to safe braking performance. This brass-bodied proportioning valve is designed for vehicles running mixed brake configurations—typically front disc brakes paired with rear drum brakes—and serves as a pressure-regulating intermediary that prevents rear wheel lockup under hard braking. For anyone operating a classic or custom vehicle with hybrid brake setups, this component is non-negotiable for predictable stopping power and fade resistance.

The Prop Valve Brass Style Each features a natural brass construction that resists corrosion and thermal stress inherent in brake system operation. This valve meters hydraulic pressure to rear drum brakes at a proportional rate relative to front disc pressure, typically reducing rear pressure by 50–65% depending on system load and deceleration rate. The brass material provides excellent thermal conductivity for heat dissipation during extended braking cycles, while the proportioning valve's internal poppet mechanism ensures pressure modulation is smooth and repeatable across varying brake pedal inputs. Its compact footprint (5.85 x 1.2 x 8.75 inches) and lightweight design (1.69 lbs) make integration straightforward into existing brake line layouts without requiring major plumbing redesign.

Restorers, hot-rod builders, and vintage vehicle enthusiasts will find the Prop Valve Brass Style Each essential when upgrading to front disc brakes while retaining original rear drum brakes. Law enforcement and emergency vehicle maintenance teams also rely on this type of proportioning valve when servicing fleet vehicles with mixed brake system configurations. Installation typically requires in-line placement in the rear brake circuit, with the valve body mounted securely to the frame or firewall. Proper bleeding and pressure verification are necessary after installation to ensure balanced braking response and eliminate fade during repeated stops. This is a direct replacement part for systems already using proportioning valve technology and is compatible with standard SAE brake line connections.