Bias Valves

Select your vehicle to see Bias Valves that fit

Bias Valves for Brake Balance Tuning

A bias valve, often called a proportioning valve, controls how much hydraulic pressure reaches the rear brakes compared to the front. Getting that balance right helps keep the rear wheels from locking before the fronts, which keeps the car stable under hard braking. People fit one after changing calipers, master cylinders, tires or weight distribution. It is also common on track, drag or custom builds where the factory balance no longer suits the car.

We currently have 7 bias valves in stock, all from Wilwood. The range includes the Wilwood Knob Adjust Proportioning Valve with inlet and outlet ports and the Wilwood Knob Adjust Proportioning Valve Combo with switch. A knob-style adjuster lets you dial in rear pressure without opening the brake lines.

  • Adjustment style: a knob is easy to reach and fine-tune between sessions.
  • Fittings: match the port thread type to your existing brake lines and adapters.
  • Switch: a combo valve with a switch can work with a brake warning light.
  • Mounting: plan a spot where you can reach the adjuster and route lines cleanly.

To narrow the list, pick your vehicle to see what fits.

Bias Valves for Brake Balance Tuning

A bias valve, often called a proportioning valve, controls how much hydraulic pressure reaches the rear brakes compared to the front. Getting that balance right helps keep the rear wheels from locking before the fronts, which keeps the car stable under hard braking. People fit one after changing calipers, master cylinders, tires or weight distribution. It is also common on track, drag or custom builds where the factory balance no longer suits the car.

We currently have 7 bias valves in stock, all from Wilwood. The range includes the Wilwood Knob Adjust Proportioning Valve with inlet and outlet ports and the Wilwood Knob Adjust Proportioning Valve Combo with switch. A knob-style adjuster lets you dial in rear pressure without opening the brake lines.

  • Adjustment style: a knob is easy to reach and fine-tune between sessions.
  • Fittings: match the port thread type to your existing brake lines and adapters.
  • Switch: a combo valve with a switch can work with a brake warning light.
  • Mounting: plan a spot where you can reach the adjuster and route lines cleanly.

To narrow the list, pick your vehicle to see what fits.