Universal Brake Proportion Valve Adjustable Prop Brake Bias Adjuster Racing Lever Type Descriptions: We strive for 100% customer satisfaction !we select the best aftermarket performance auto parts at the best prices! This is a new brake proportioning valve, this adjuster is good from 100-1000 PSI provides for a maximum decrease of 57% in line pressure. With this adjustment,you can fine tune the front to rear braking balance by proportionately decreasing the rear brake line pressure. When upgrading to rear disc brakes or larger front brakes, a proportioning valve is usually required. Specification: Condition: New Style: Knob Material: Aluminium Color: Black Rate : 0 to 57% Package: 1 Brake Proportioning Valve Note: Due to manual measurement, please allow 1-3cm difference. Due to the difference between the display and the light, the picture may not reflect the actual color of the item. Thank you for your understanding.