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I need a differential valve for my 1975 f250 4wd drum/drum truck. Does anyone know the ford part number or know of a place where I can buy new valves. Here is a picture of my old one:
The numbers on the block are somewhat worn off, I believe they are:
I used a early mustang drum/drum distribution valve for my 75 f250 Highboy.
Works perfectly , I can try to dig up the vendor I used and the actual pn later this week when I get back to my files.
I tried rebuilding my original one and even tried a second used OEM one with no luck.
I did have to change fitting sizes on the lines leading into the new block but that was no big deal.
Tbruz
Thanks for the responses. Does anyone know any other valves that will work in my application? Id put a earlier mustang valve (as Tbruz mentioned), if I knew it would work and where I can find it.
I cannot get the get the piston to center, it appears its stuck. Ive tried to remove it with needle nose plyers, and no luck.
Thanks for the responses. Does anyone know any other valves that will work in my application? Id put a earlier mustang valve (as Tbruz mentioned), if I knew it would work and where I can find it.
I cannot get the get the piston to center, it appears its stuck. Ive tried to remove it with needle nose plyers, and no luck.
Any '67-'72 F100 - F350 truck will have the same type of pressure differential valve as what you have. The mounting bracket will be different.
The same problem of a stuck pressure differential valve spool MAY be possible. Then again, it may move freely.
I just recently sold my old (functional) drum/drum pressure differential valve off my '69 F100 2WD, since I have '77 F100 front discs on it now and I installed an OEM/NOS disc/drum brake valve for an '84-'86 F150/Bronco on my truck.
That was my problem as well, could not get the valve centered and thus the brake light on the dash was always on. As ultraranger and others have mentioned, that valve goes nothing but control the brake light via a centered plunger type switch.
Thanks
Tbruz
Get a Wildwood and be done. Some aftermarket companies sell a replacement but my experience with them is not good.
The Wilwood valve will only, in simplistic terms, just be a hydraulic distribution manifold with a manually-adjustable proportioning valve built in. It will not have any means to sense for a differential in pressure between the primary (front) and the secondary (rear) brake circuits, nor does it have any safety feature of warning for a hydraulic drop in pressure between the two circuits.
Also, proportioning is not used on a truck with all-wheel drums.
Wild horses bronco site sells them for $74.99. I bought their disc brake conversion kit for my 75 truck and I got the new valve for the disc front drum rear. They do sell the the ones for disc/disc. Drum/Drum. I looked at the part for the older broncos. I would bet it would work for our trucks.
Wild horses bronco site sells them for $74.99. I bought their disc brake conversion kit for my 75 truck and I got the new valve for the disc front drum rear. They do sell the the ones for disc/disc. Drum/Drum. I looked at the part for the older broncos. I would bet it would work for our trucks.
The valve(s) from Wild Horses is a reproduction of the Weatherhead valve that was manufactured for GM vehicles. It's a common generic reproduction valve that's sold through the aftermarket for various vehicle applications.
It says the difference between the disc/drum valve and the drum/drum-disc/disc valve is that there's no metering valve to the front brakes on the all-wheel discs/all-wheel drums valve, yet, they both have the exact same part number (?).
Assuming there actually is any difference between the valves, that means the drum/drum-disc/disc valve has the pressure differential feature along with a proportioning feature to the rear brakes.
The proportioning feature would be useless for the rear drums on a drum/drum application since no factory 4-wheel drum application was engineered for proportioning to the rear drums.
Either the description of the valves and their functions are not clearly presented or, they're selling aftermarket parts without an understanding of what brake component features apply or don't apply to certain brake configurations.
I used a early mustang drum/drum distribution valve for my 75 f250 Highboy.
Works perfectly , I can try to dig up the vendor I used and the actual pn later this week when I get back to my files.
I tried rebuilding my original one and even tried a second used OEM one with no luck.
I did have to change fitting sizes on the lines leading into the new block but that was no big deal.
Tbruz
Hi Buddy. How about the vendor/part # of the early Mustang Proportioning/comb valve, that worked on you pickup? Thanks.
Drum/drum & disc/disc: No need for a metering valve but a proportioning valve is a good idea, I will explain letter. A combo proportioning/pressure differential valve is even a better idea if you have the warning light.
Disc/Drum: Must have a metering valve but a combination valve Metering/proportioning & pressure differential is even better if you have the warning light. To make this even better add a 10lbs residual valve to your rear brake line (Drum) and you will be amazed with your pedal feel.
Not to insult anyones intelligence but let me explain each valve:
Proportioning Valve: adjusts pressure to the rear barkes (Drum) to offset the inherent nose dive during braking so that the rear brakes don't lock up as the rear lifts. You can also purchase these valves in adjustable models.
Proportioning valve: Designed for Disc/Drum systems to meter the brake fluid to allow fluid to the back brakes first (Drum brakes have a distance to travel before they engage or approx. 10lbs PSI) before engaging the disc brakes which are in contact with the disc.
Pressure differential valve: Really just a distribution block that also equalizes line pressures to all 4 corners, if its not equal you will receive a warning on your dash light etc.
Residual valve: An inline check valve that keeps 10lbs PSI of pressure on your rear brake lines, removing the distance required for drum brakes to actuate which in turn requires less pedal depression to actuate the brakes. You can also get 2lbs valves for disc brakes but it is normally for racing applications only.
Combination valves: Can incorporate two or more of the above into one valve.
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