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What is a Motorsport Bias Valve by Upgrade Motorsport

Updated: 5 days ago

What is a Motorsport Bias Valve by Upgrade Motorsport

A motorsport bias valve, also known as a brake proportioning valve, is a critical component in high-performance and competition vehicles. It allows drivers or engineers to adjust the balance of braking force between the front and rear wheels, ensuring maximum efficiency under various track conditions.

Race cars speed on a wet track, leading two cars: one green and one orange. Mist rises, with blurred stands in the background.
Brake Balance is Essential in Wet Conditions

How It Works

So what is a Motorsport Bias Valve by Upgrade Motorsport? In any braking system, weight transfer occurs when the driver applies the brakes. This results in the front of the car dipping down, placing more load on the front tyres while reducing grip at the rear. A motorsport bias valve controls hydraulic pressure in the brake lines, allowing fine-tuning of the force distributed to each axle.


The valve functions by restricting brake fluid pressure to the rear circuit. It typically consists of an adjustable screw or lever, which modifies an internal passage to control the rate of fluid flow. Some versions operate manually, enabling the driver to make adjustments in real time, while others are pre-set during setup.


When the valve is turned to reduce rear brake pressure, it prevents excessive locking of the back wheels, improving stability and reducing the risk of oversteer. Conversely, increasing rear brake force can help in certain conditions where more balance is required, such as in low-grip environments or specific weight distributions.


Aluminium motorsport bias valve lever type valve with red labeled "MORE BRAKE" and black base marked "Upgrade Motorsport" on a white background.
Upgrade Motorsport Bias Valve - Lever Type

Why It Is Used

  1. Optimised Braking PerformanceDifferent track surfaces, weather conditions, and vehicle setups require changes in brake bias. A bias valve enables precise control, allowing teams to set up the car for optimal braking efficiency.


  2. Prevention of Lock-Up and SkiddingIf too much force is applied to the rear brakes, the wheels can lock up, causing instability and a loss of control. A properly adjusted valve ensures controlled deceleration without unnecessary skidding.


  3. Adaptability to Race ConditionsAs fuel loads decrease, tyre grip changes, or weather conditions shift, a bias valve allows for quick adaptation without major mechanical modifications.


  4. Enhanced Cornering StabilityIn motorsport, controlled braking into a corner is vital. A well-set bias prevents the rear from becoming too light, reducing snap oversteer and maintaining a smooth racing line.


  5. Compensation for Vehicle Load ChangesIn endurance racing or rallying, where weight shifts due to fuel burn-off or rough terrain, the valve allows adjustment to maintain balance over long distances.


    Upgrade Motorsport Bias Valve Screw Type Aluminium Silver pressure control valve labeled "Upgrade Motorsport" on black base with red detail, white background.
    Upgrade Motorsport Bias Valve - Screw Type

Conclusion

A motorsport bias valve is a crucial tool for fine-tuning brake performance. By regulating hydraulic pressure between front and rear brakes, it ensures stability, prevents wheel lock-up, and allows for real-time adjustments to suit racing conditions. Whether in circuit racing, rallying, or endurance events, this component is essential for maximising control and efficiency.

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