Brake Proportion Valve Adjustable Fit For Car Prop Brake Proportion Valve Enhance your vehicle's braking system with this adjustable valve knob, allowing you to customize your driving experience. Improve safety and control on the road by adjusting the brake bias to suit your specific driving conditions. Failure symptoms include rear wheel lockup on wet roads or excessive rear brake wear from over-pressure. Works passively without electronics, using spring-loaded plunger and lever connected to rear suspension., Manufacturer: HAEDGUO