VR - Brake Bias Proportioning Valve Pressure Regulator For Brake Adjustment 1/8-27 NPT Pressure Regulator Screw Knob Type Note: Adjustable brake bias valves are required by traffic authorities to be mounted in such a position as to not be adjusted from the driving position.The above is not applicable to race or registered rally cars. Specification : Application: Universal. 100% quality assurance tested, more responsive, less expensive, easier to install. Pressure adjustments range from 100-1000 PSI. Provide for a maximum decrease of 57% in line pressure. Allow you to fine tune the front to rear braking balance. Brings a much better overall braking performance. Material: made of high qualityAluminum. Color: as picture. Package Included: 1xBrake Proportioning Valve; 2x 1/8-27 NPT Inlet/Outlet Ports.(100% Brand New Never Used Or Installed) Installation Instructions: 1.Drain the brake fluid before you do anything else. 2.Use the two 0.25 body holes to secure the valve to a mount. 3.Connect the IN port to the pressure line coming from the master cylinder. 4.Connect the line going to the calipers to the OUT port. 5.Rotating the adjuster knob clockwise until it is all the way in. 6.Bleed the brake and check for any leaks at the valve or its fittings. 7.Do some test braking to adjust the bias before it works properly. Cautious : Make sure the valve isn t rubbing against any other brake lines or contact with the hood. Operation : The knob rotated all the way out (counter-clockwise) will provide a maximum pressure reduction of 57%. Rotating the know in (clockwise) will incrementally increase line pressure, up to full pressure. All items are Brand New unless stated otherwise on the listing. We sell DIY (Do It Yourself) Items with a few exceptions. We take no responsibility in teaching you how to install. Professional installation is strongly recommended.