How do you fix a tripped proportioning valve?
How to Reset a Brake Proportioning Valve
- Locate the brake proportioning valve near the rear brake line. It will have one or two buttons located on it.
- Push the reset button located on the valve with your fingers, which will reset it so the valve is working properly again. Inspect the brake pressure.
Can you bleed a proportioning valve?
The proportioning valve doesn’t have any way to bleed air, so you will have to bleed the front and rear brake lines in order to remove any air trapped in the valve. Park your car on a flat surface and set the emergency brake, to prevent your car from rolling while you are working under it.
What is the difference between a metering valve and a proportioning valve?
The metering valve works with a proportioning valve to achieve balanced braking in these systems. A proportioning valve is located in-line to the rear brake system. It’s used to prevent rear-wheel lockup during sudden and hard braking situations.
How exactly does a brake proportioning valve work?
An adjustable proportioning valve changes the front to rear brake balance by reducing the hydraulic line pressure to the rear brakes, whenever the inlet pressure is above the breakpoint pressure set by the valve adjustment. Below the breakpoint pressure, the rear line pressure will always be the same as the front pressure.
What does the proportioning valve do for my brakes?
The proportioning valve, also called the combination valve, is located in the disc braking system. It is responsible for controlling the braking pressure between the front and rear brakes . Equal brake force cannot be applied to all of the wheels on the car at the same time because the rear wheels will lock up.
How does a proportioning valve work?
A proportioning valve is a valve that relies on the statics to supply a reduced pressure to an output line. A simple example is where spring load applies a reducing force so that the output pressure is reduced. Proportioning valves are frequently used in cars to reduce the brake fluid pressure to the rear brakes.
Is proportioning valve needed for drum brakes?
Early drum brake cars accomplished it by sizing the rear brakes smaller than the fronts. When disc/drum combos came along, the easiest way to control the rear brake effort was to use a proportioning valve. Disc/disc brakes using the same size rotors/pads continue to need proportioning valves.