Brake Proportioning Valve 2 Wheel Disc

The Brake Proportioning Valve 2 Wheel Disc (model PV71) is a critical hydraulic control component designed for vehicles equipped with dual-disc front brake systems paired with drum brakes at the rear. This brass proportioning valve meters brake fluid pressure between the front and rear circuits, preventing rear wheel lockup during hard braking and maintaining balanced stopping power across all four wheels. Built for enthusiasts upgrading older vehicles or restoring classic cars with modern disc brake conversions, this valve ensures your braking system delivers consistent, predictable performance in both street and performance driving scenarios.

Constructed from brass for durability and corrosion resistance, the brake proportioning valve operates by restricting pressure flow to the rear wheel cylinders as front disc brake pressure rises—a passive mechanical function that requires no electrical input or maintenance. The two-wheel disc configuration accommodates setups where both front wheels feature disc brakes while rear wheels retain drum brake assemblies, a common architecture in vehicle retrofit projects and period-correct restorations. Weighing just 1.57 lbs with compact dimensions of 3 x 1.45 x 6.2 inches, the valve integrates into tight engine bay spaces while delivering reliable pressure regulation that prevents rear brake fade and wheel lockup—critical safety factors when upgrading braking systems on vehicles originally engineered for single-circuit hydraulics.

Mechanics and restorers working on classic American and European vehicles benefit most from this proportioning valve when modernizing aging brakes or swapping disc brake components into drum-equipped platforms. The brass body withstands repeated pressurization cycles and temperature fluctuations common in performance driving and summer heat, while the compact footprint allows installation in original valve locations or custom mounting applications. Proper installation requires inline placement in the rear brake circuit between the master cylinder and rear wheel cylinders—consult your vehicle's brake schematic and consider professional installation if unfamiliar with hydraulic brake system work. This valve is essential for achieving safe, balanced braking geometry when upgrading front brakes independently of rear brake components.