Ford Brake Repair: How to Repair a Proportioning Valve
Performing Ford brake repair should be done as soon as you believe there is a problem with the system. You should never wait to have your brakes looked at, or repaired, when you are having a problem stopping the vehicle. Many people elect to do the repairs themselves as doing simple brake repairs will save a lot of money at the repair shop. One such repair that can be done by a do it yourself mechanic is replacing a proportioning valve. This valve is important to give each brake the necessary amount of fluid to effectively operate the calipers and pads. When your is leaking, or not working properly, here are the steps necessary to replace it.
Step 1 - Raise Front End off Ground
The proportioning valve is located on the driver's side of the engine compartment on the frame. It sits under the master cylinder so you will need to go under your car to get at it. Use a heavy duty floor jack to raise the front end of the vehicle off the ground. Secure it with jack stands that are on either side of vehicle. Never rely on the jack itself to keep your car suspended.
Step 2 - Remove Front Tire
It is easier to get at the proportioning valve if you remove the front tire. This gives you a lot more space to work. Use a lug wrench or an impact wrench to remove the tire.
Step 3 - Disconnect All Lines
To remove the proportioning valve you will need to disconnect the brake lines that are coming out of it. You will also have to disconnect the wire harness that goes to the low brake fluid light on your dash. This harness is removed by pressing on the tab that releases the clip. Use an open ended wrench release the compression nuts that hold the brake lines to the valve.
Step 4 - Unbolt Valve
The proportioning valve is held on with several small bolts. You can use some penetrating oil if they are rusted into position. Use your ratchet set to back out the bolts and remove the valve.
Step 5 - Replace with New Valve
Once the old proportioning valve has been removed you can immediately set the new valve into place. Secure it with the bolts that were already in place.
Step 6 - Make Line Connections
Once the new valve is in place you can re-connect the brake lines.
Step 7 - Bleed Brake Lines
Now that the lines are re-connected you will need to bleed the lines of any air. Locate the bleeder screw on the right rear passenger side of the car and unscrew it to open the line. Place a plastic hose over the screw and let it go into a drain pan. Have a friend press the brake pedal until you begin to see the brake fluid come out in an unbroken stream. Close up the screw and move onto another wheel.
Step 8 - Fill Master Cylinder
During the bleeding process, and after, you will need to continually refill the brake fluid in the master cylinder.
Step 9 - Re-Connect Wire Harness
Re-connect the low brake fluid wire back onto the valve and replace the front tire.