Upgrade Motorsport Brake Bias Valve – Installation, Bleeding & Fitment Guide

Grant Lockhead
Oct 9
2 min read

Updated: Oct 19

Lever and Screw Type Brake Bias Valve – Installation, Bleeding & Fitment Guide

Upgrade your brake system with precision using the Lever Type or Screw Brake Bias Valve and follow this guide to ensure safe, efficient installation and optimal performance.

Silver pressure valve with a turn knob labeled "MORE PRESSURE," black base, red connector. Set against a white background.

Mounting the Valve

Location: Install the valve inline with the rear brake line. Common placements:
- Inside the cockpit by the handbrake for easy adjustment while driving
- They can also be positioned on a dashboard for quick and easy access in tight cockpits
Mounting Points: Use the two M6 mounting holes on the valve body. Ensure the valve is securely fastened to prevent movement during operation.

Connecting Brake Lines – Incorrect Fitment Will Damage!

Inlet (Master Cylinder Side): Connect the brake line from the master cylinder to the top port labeled "IN".
Outlet (Rear Brakes Side): Connect the brake line leading to the rear brakes to the bottom port labeled "OUT".

⚠️ Warning: Reversing these connections can cause serious damage to the valve and brake system. Always double-check port orientation before tightening fittings, and follow our Brake Bias Valve – Installation, Bleeding & Fitment Guide.

Black and silver valve with a red handle labeled "MORE BRAKE." Text reads "Upgrade Motorsport." Simple white background.

Adjustment

Initial Setting: Start with the lever in the fully open position (maximum rear brake pressure).
Adjustment Range: The lever type has 6 positive detent positions, allowing fine-tuning of rear brake line pressure (0–51% reduction).
Operation: Adjust the lever or knob during driving to optimise front-to-rear brake balance.

Bleeding Procedure

Valve Position: Set the lever to fully open before bleeding. This ensures unrestricted fluid flow.
Bleeding Sequence: Always bleed brakes in this order:
1. Right Rear → 2. Left Rear → 3. Right Front → 4. Left Front
Method: Manual, vacuum, or pressure bleeding all work effectively.
Post-Bleeding: Return the lever to your desired position for optimal brake balance.

Fitment Tips

Accessibility: Ensure the valve is mounted for easy adjustment during driving.
Clearance: Maintain adequate space from moving parts and heat sources.
Secure Mounting: Use proper hardware to prevent movement that could affect brake performance.
Brake Line Routing: Avoid sharp bends and areas with high heat exposure.

Silver and black hydraulic valve with a knurled knob labeled "MORE PRESSURE." Background is plain. Text reads "Upgrade Motorsport."

Safety and Installation Disclaimer

Upgrade Motorsport products are designed for use in competition and specialist vehicles that vary significantly in size, weight, configuration, and application. The responsibility for correct installation, suitability, and safe use lies entirely with the purchaser and/or installer.

Upgrade Motorsport and any member of its team accept no legal liability or responsibility for any accidents, incidents, damages, personal injury or death proven to be caused by or related to the use of any component supplied by Upgrade Motorsport.These products are installed in diverse motorsport and automotive environments, and it is the sole responsibility of the end user to ensure compatibility, compliance, and safe operation. All installations should be carried out by a qualified professional.

Black and red sign with "Upgrade Motorsport" text. Below, "High-Quality/Lightweight/Reliable" in white. Mood is bold and professional.