Where is the proportion valve located?
Where is the proportion valve located?
The proportioning valves are found on vehicles with front disc, rear drum brake systems. They keep the rear brakes from locking up during sudden, hard braking by restricting fluid pressure to the rear brakes.
How do you test a proportion valve?
Pressure gauges are the best way to diagnose a failed proportioning valve. There will be a gage installed into the front and rear hydraulic circuits. Start the vehicle, and apply the brake pedal with heavy pedal pressure to duplicate a panic braking situation. The front and rear pressures should be different.
Where is the proportioning valve in a car?
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.
What are the symptoms of a bad proportioning valve?
If you suspect there is an issue with your proportioning valve, check for the following symptom: Rear wheels lock up Since the proportioning valve decreases the pressure sent to the rear brakes, the main symptom the valve is going bad is the rear wheels locking up when the brakes are applied.
Is the Kelsey Hayes proportioning valve the same?
The Kelsey-Hayes proportioning valve assembly is identical. Now remove the switch assembly using the 5/8″ box wrench. You’ll find another o-ring seal that will need to be included in a rebuild kit. The Kelsey-Hayes switch assembly is identical.
What do I need to rebuild a proportioning valve?
Start by removing the plug at the end of the proportioning valve using the 3/4″ socket or box wrench. Remove the seals, spring, and piston. The spring found in these valves is usually resistant to corrosion and may be reusable. The three seals (o-ring, u-cup, and piston seal) will need to be included in a rebuild kit.
Where is the proportioning valve on a car?
Proportioning Valves and Balance Bars. A Proportioning Valve is installed in the rear brake line and allows you to adjust the rate of pressure rise to the back brakes. With an adjustable proportioning valve, you can slow down the pressure rise that occurs when you apply the brakes.
How do you get a proportioning valve unstuck?
Apply the emergency brake and lift the hood. Unscrew, or unsnap the master cylinder cap and fill the master cylinder with brake fluid to the top limit line. Leave the cap off. Use a floor jack to raise the vehicle at the front end and place two jack stands under the frame near each wheel.
The Kelsey-Hayes proportioning valve assembly is identical. Now remove the switch assembly using the 5/8″ box wrench. You’ll find another o-ring seal that will need to be included in a rebuild kit. The Kelsey-Hayes switch assembly is identical.
Start by removing the plug at the end of the proportioning valve using the 3/4″ socket or box wrench. Remove the seals, spring, and piston. The spring found in these valves is usually resistant to corrosion and may be reusable. The three seals (o-ring, u-cup, and piston seal) will need to be included in a rebuild kit.
