Adjustable Brake Bias Proportioning Valve

Adapters

£44.09

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Adjustable Brake Bias Proportioning Valve – Precision Braking at Your Fingertips

Take full control of your vehicle's braking with our brake bias valves. Designed for precision, this high-performance component allows you to fine-tune front-to-rear brake pressure, optimising balance for track days, competition, or fast road driving.

Why Choose Our Brake Bias Valve?

Customisable Brake Balance

Easily adjust line pressure to the front or rear brakes, tailoring braking force to match driving conditions, track surfaces, and weather.
Wide Pressure Adjustment Range

Achieve a 57% maximum pressure reduction, with fine-tuned adjustments from 100–1000 PSI for precise braking performance.
Universal Fit for Competition & Performance Vehicles

Our brake bias valves are designed to integrate seamlessly into most braking systems with minor brake line modifications. Ideal for track and motorsport applications. You can also design your own custom brake lines to suit your bias valve.
Durable CNC-Machined Aluminium Construction

Made from lightweight yet robust CNC-machined aluminium, our brake bias valves are finished with a black anodised coating for superior corrosion resistance and long-lasting durability.
Effortless Installation

Equipped with 1/8" NPT inlet and outlet ports and changeable adapters, plus M6 mounting holes for secure panel attachment.
Seamless, Infinite Adjustment

The smooth, click-free adjustment knob allows for precise tuning without preset stops, giving you total control over your braking balance.
Versatile Fitting Options

Supplied as standard with brass 1/8" NPT male to 3/8" UNF female adapters. Optional 1/8" NPT male to 3/8" UNF male stainless steel adapters are available for connecting 3/8" UNF female fittings.

How the Brake Bias Valve Works

Fully threaded in (clockwise)

Delivers 90% braking force to the rear.
Fully threaded out (counter-clockwise)

Reduces rear braking force to 43%.

Simple Brake Bias Valve Installation & Setup

Drain brake fluid before installation.
Secure the brake bias valve using the M6 mounting holes.
Connect the IN port to the master cylinder brake line.
Connect the OUT port to the rear caliper brake line (usually the line coming from a rear t-piece).
Bleed the brake system and check for leaks.
Adjust the brake bias valve to fine-tune braking balance and test.

Optimise Your Braking Performance Today!

Whether you're looking to improve track performance, adapt to changing road conditions, or gain a competitive edge, our brake proportioning valve delivers the control and precision you need. Upgrade your braking system today and experience superior stopping power!

Frequently Asked Questions

What is a brake bias proportioning valve used for?
This valve allows you to fine-tune the front-to-rear brake pressure distribution in your vehicle. It's essential for optimising braking performance, particularly in high-performance, track, or modified road cars, by preventing rear wheel lock-up and enhancing overall stability during braking.
What are the technical specifications of this valve?
Key bias valve specifications include:
- Pressure Adjustment Range: 100–1000 PSI
- Maximum Pressure Reduction: 57%
- Inlet/Outlet Ports: 1/8"-27 NPT
- Supplied Adapters: 2x AN3 (3/8"-24 UNF) Female (Brass)
- Optional Adapters: 2x AN3 (3/8"-24 UNF) Male (Stainless Steel) for an additional cost
How do I install the brake bias valve?
Installation involves integrating the bias valve into the brake line leading to the rear brakes. Connect the 'IN' port to the line from the master cylinder and the 'OUT' port to the rear brake line. Ensure all connections are secure and leak-free. It's recommended to mount the valve in an accessible location for easy adjustments. You can design your own custom braided brake lines if you don't already have suitable brake lines.
How do I adjust the brake bias using this valve?
Adjust the valve by turning the knob:
- Clockwise: Increases rear brake pressure
- Counter-clockwise: Decreases rear brake pressure
Start with the brake bias valve fully open (maximum reduction) and gradually adjust while performing test stops to achieve the desired braking balance.
Is this bias valve compatible with your custom braided hoses?
Yes, the valve is compatible with our range of custom braided brake hoses. The supplied and optional adapters ensure seamless integration with various brake line configurations.
Is the adjustable brake bias proportioning valve reusable?
Yes, the brake bias valve is designed for repeated use. It can be adjusted as needed and transferred to different vehicles or setups, provided it's in good working condition.