How do you unstick a combination valve?
Tap the proportioning valve with a tack hammer several times lightly — sometimes this frees up a corroded bore and piston spool inside the valve. Wiggle the brake light warning switch wire on the top of the proportioning valve, making sure it has a tight, clean connection.
What does a combination valve do on a car?
The valve restricts how much pressure is applied to the rear brakes, without this feature the rear system would lock up and cause the car to go out of control.
How do you know if your proportioning valve is stuck?
Have an assistant start the engine and apply the brakes very hard. The paperclip should push upward from 1/32 to 1/16 of a inch as a result of the sudden pressure. If the paperclip does not move at all, this means the proportioning valve piston is frozen stuck inside the cap screw. Replace the proportioning valve.
Do I need a metering valve?
For your disc / drum brake system, a metering valve is essential for proper balance. A metering valve will control fluid flow from the master cylinder causing the rear drum brakes to engage just before the front disc brakes. This allows the car to settle evenly under braking instead of nose diving.
What is the purpose of a metering valve?
A brake metering valve is used to Balance the Braking Forces. It is only found on vehicles with front disc and rear drum brakes. The metering valve holds back fluid to the front brakes until enough pressure is created to overcome the return springs inside the rear drums. It is also known as a “metering block.”
How exactly does a brake proportioning valve work?
The brake proportioning valve is a metering device that equalizes the pressure between the front and rear brakes. The valve stops the flow, or pressure of brake fluid to the rear drum brakes during every heavy braking or emergency stops; otherwise, the rear brakes lock up and skid, receiving too much pressure from the master cylinder.
What is a brake proportioning valve?
The proportioning valve in a vehicle’s brake system provides a way to control how much and when brake pressure is applied to each axle set of the brake system. Located between the master cylinder and the rest of the brake system, this component is the key to safe, reliable brake system operation in all conditions.
What is a combination valve?
Combination Valves: Brakes For Classic Cars. A Combination Valve, commonly called a Proportioning Valve, is just what the name implies…a valve that does a combination of things. The valves are available for both disc/drum and for disc/disc brake systems.
What is a brake proportional valve?
Brake Proportioning Valves. The proportioning valve is installed on vehicle’s with front disc, rear drum brake systems. They provide balanced braking during sudden, hard braking by restricting fluid pressure to the rear brakes. This helps prevent rear wheel lock up as the vehicle’s weight is shifted toward the front wheels.