The front portion of my proportioning valve is leaking. I've not been able to source the piece -- I've tried Ford, Advance Auto, Autozone, NAPA, and a few local shops. Ford identifies the same piece for a 1987 Ford Thunderbird V6 as E7SZ-2B091-A. (The part for a 1989 Ford Mustang is E7ZZ, not sure what the difference is.)
Haynes calls the piece a combination Proportioning Valve & Shuttle Valve.
The device has a bolt on the front and the rear (for factory assembly, I believe), with two inputs on top and two outputs on the bottom. The inputs are sourced from two of the three ports of the master cylinder. The front output appears to go to the rear brakes, while the rear output appears to go to the front right brake. The front left brake is driven directly off the third port of the master cylinder.
So a few questions:
1) How can I source a new/rebuilt proportioning valve? Or find a rebuilt kit? Or figure out how to rebuild it? It is leaking out of the front plug. I believe the proportioning valve inside also has a rubber gasket (from Internet searches) that will need to be replaced.
2) Why is the FL brake driven off the master cylinder, while the FR brake is driven off this valve? I suspect it has something to do with preventing a single point of failure.
3) If I can't get a new/rebuilt one, how can I repair the car? I'm thinking that I might have to buy an adjustable proportioning valve for the rear brakes, and somehow "straight through" the FR brake. Details would definitely be appreciated!
Thanks guys,
--Mark
Mark Satterfield - Florida, Miami, Clearwater, Tampa, Melbourne, Orlando - Computers, Engineering
Haynes calls the piece a combination Proportioning Valve & Shuttle Valve.
The device has a bolt on the front and the rear (for factory assembly, I believe), with two inputs on top and two outputs on the bottom. The inputs are sourced from two of the three ports of the master cylinder. The front output appears to go to the rear brakes, while the rear output appears to go to the front right brake. The front left brake is driven directly off the third port of the master cylinder.
So a few questions:
1) How can I source a new/rebuilt proportioning valve? Or find a rebuilt kit? Or figure out how to rebuild it? It is leaking out of the front plug. I believe the proportioning valve inside also has a rubber gasket (from Internet searches) that will need to be replaced.
2) Why is the FL brake driven off the master cylinder, while the FR brake is driven off this valve? I suspect it has something to do with preventing a single point of failure.
3) If I can't get a new/rebuilt one, how can I repair the car? I'm thinking that I might have to buy an adjustable proportioning valve for the rear brakes, and somehow "straight through" the FR brake. Details would definitely be appreciated!
Thanks guys,
--Mark
Mark Satterfield - Florida, Miami, Clearwater, Tampa, Melbourne, Orlando - Computers, Engineering