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Classic Mustangs Tech Forum

Technical discussions specific to 1964-1967, 1968-1970, and 1971-1973 Classic Mustang. Discuss all tech related to in-line six cylinder and V8 powered Vintage Mustangs here.

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Unread 12-15-2008   #1 (permalink)
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Default 1968 mustang proportioning valve/distribution block

ok so 2 of my lines going into the distribution block are stripped and i figure im just gonna replace all the lines and the distribution block. Well i can't find any distribution block ANYWHERE except oreileys auto and its an ssbc distribution block/proportioning valve. I was wondering if anyone has ever used them and if they work great and would be good w/ my front drums rear drums. Also what cars if any could i pull a distribution block off of in a junkyard cuz i'd rather get 3 used distribution blocks rather than spend 120 dollars on a brand new one that is only NEEDED with disc brakes. i have manual brakes. and would it sorta add a boost to my manual brakes if i did buy the proportioning valve?
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Unread 12-15-2008   #2 (permalink)
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The proportioning valve from the torinos, cougars, and the lincolns were the same for the mustangs until 70 or 71. And not to much of a real boost unless you change to power brakes with a brake booster. But the proporting valve will allow more fluid to the brakes.
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Unread 12-15-2008   #3 (permalink)
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SSBC produced items are of high quality, hence the high price. Have you thought about tapping the distribution block to clean up the threads? Just a thought to save money. If not, try this: www.larrystbird.com. They list the block for $70.14 and don't be fooled by the Tbird designation. They have a catalog for just Mustangs and list numerous parts. I have used them and they are great. There is also a phone number: (800) 854-0393. Make sure you get the proportioning valve for drum brakes only. Another one for disc brakes/drum brakes will not work and will not add any additional brake power. As far as which other years will work, I'm not sure, but they do have books that list compatibility with other years. Maybe one of the Mustang guys/gals on this forum can help you with that question. Good luck with the brakes.
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Unread 12-15-2008   #4 (permalink)
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Try Johns Mustang in Texas. I got one for my 67 there.
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Unread 12-21-2008   #5 (permalink)
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I got one off of a 86 mustang looked pretty simple 2 for the front one for the rear and i also pulled one out of a 67 galaxy just like mine. Jw wondering should there be any problems with these 2 distribution blocks?
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Unread 12-22-2008   #6 (permalink)
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I sense some confusion between the distribution valve and the proportioning valve. On a car with all drum brakes a proportioning valve isn't used. This is only required on a disc brake system or a disc/drum system. It regulates the amount of hydraulic pressure that is applied to the front verses the rear. A combination valve has both valves incorporated into one unit.

On a dual braking system, there will be a small spool inside of the dist. valve that gets pushed to the side with the lesser pressure (because of a system leak) and the spool then blocks that end off. The spool at the same time pushes on a pin built into a nylon electrical switch that is screwed into the valve. When this happens it completes a ground circuit that lights a brake failure bulb in the instrument cluster.

On a car that has a front and rear drum sys. (manual or power), only a distribution valve is used or needed, as said. It is there to block off either the front or rear hydraulics if a leak is present (dual brake sys) and obviously, to provide a path for the brake fluid. It doesn't affect any pressure. The pressure differential needed between the front and rear, with drums, is controlled by the difference in the wheel cyl piston size and master cyl piston size as determined by the factory.

Any 67 and up to about 1970 and maybe later, Ford vehicle with a drum front brake should have the same separate dist. valve and not a combination valve. There is a difference in the mentioned small nylon electrical switch that mounts to the valve on a 67 (67 only). It only has one electrical prong where from 68 and up it has two prongs. All you need to do is to swap the switch over to the one that you have on your 68, so that the connector will attach. This switch activates the brake failure light on the dash, again as mentioned.

When searching for a used valve, try to find one that still has the lines attached. I have found some valves that have had the lines removed and were exposed to moisture. The moisture seized the spool in the valve block. The way that the valve is designed makes it impossible to use any tool to remove the spool for cleaning and if it can't be pushed out using compressed air, you wouldn't want to use it anyway.
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Unread 05-13-2009   #7 (permalink)
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Hi! I have a problem with my brakes. front discs and rear drums. The rear brake lines does not get fluid. I am trying to vent the brakes but its still dry as sahara back there.. is it the distribution block that needs replacement or is there a trick to it. The greek: I saw you mentioned a valve on the distribution block to prevent leaks. Can this be closed.. if so how do i open it. My feet are about to get tired from pumping my brake
Its a 72 ford gran torino sport btw
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Unread 04-09-2010   #8 (permalink)
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Quote:
Originally Posted by gts72 View Post
Hi! I have a problem with my brakes. front discs and rear drums. The rear brake lines does not get fluid. I am trying to vent the brakes but its still dry as sahara back there.. is it the distribution block that needs replacement or is there a trick to it. The greek: I saw you mentioned a valve on the distribution block to prevent leaks. Can this be closed.. if so how do i open it. My feet are about to get tired from pumping my brake
Its a 72 ford gran torino sport btw
I'm having the exact same problem. Can anyone help with this?
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Unread 04-10-2010   #9 (permalink)
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Quote:
Originally Posted by gts72 View Post
Hi! I have a problem with my brakes. front discs and rear drums. The rear brake lines does not get fluid. I am trying to vent the brakes but its still dry as sahara back there.. is it the distribution block that needs replacement or is there a trick to it. The greek: I saw you mentioned a valve on the distribution block to prevent leaks. Can this be closed.. if so how do i open it. My feet are about to get tired from pumping my brake
Its a 72 ford gran torino sport btw
Analyze the Circuit with the problem. Start at the Master, Is there adequate pressure/Fluid at the Master, Crark line, watch for fluid to spew out, If so on to the Distribution block, do same thing at fitting that supplies the block, If good fluid flow, go to other side, out. If no fluid, it is blocked inside with trash, rust, est. If you have fluid, proceed on.

It will show up, it has to. This can be used on any brake system.

A Proportioning valve does not increase fluid flow, it cushions the fluid flow to the rear brakes. A Proprtioning valve has NOTHING to do with front disc brake fluid delivery.

The Greek explaination was excellent, Distribution block are different that Proportioning valves, folks gets these mixed up.

Dan @

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Unread 04-10-2010   #10 (permalink)
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Quote:
Originally Posted by chockostang View Post
Analyze the Circuit with the problem. Start at the Master, Is there adequate pressure/Fluid at the Master, Crark line, watch for fluid to spew out, If so on to the Distribution block, do same thing at fitting that supplies the block, If good fluid flow, go to other side, out. If no fluid, it is blocked inside with trash, rust, est. If you have fluid, proceed on.

It will show up, it has to. This can be used on any brake system.

A Proportioning valve does not increase fluid flow, it cushions the fluid flow to the rear brakes. A Proprtioning valve has NOTHING to do with front disc brake fluid delivery.

The Greek explaination was excellent, Distribution block are different that Proportioning valves, folks gets these mixed up.

Dan @

ChockoStang
For some background: every single component on the braking system has been replaced (the car had been sitting for 12 years). All new hydraulics and all new lines. I have fluid going into the proportioning valve and no fluid coming out. This is on the rear circuit of the braking system (front disc, rear drum). Fronts work fine. I removed the proportioning valve and removed the large nut on the bottom. It's the rear brake portion of the valve. It was full of all kinds of junk. My question is: can I just clean that all up and reinstall into the vehicle with no problems? Thanks.
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Unread 04-11-2010   #11 (permalink)
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Came by to bump this.
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Unread 10-29-2010   #12 (permalink)
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I am experiencing the same problem with the lack of fluid to the rear brakes. (Front Disk & Rear Drum) I just replaced the master when I had my booster rebuilt and now I can't get anything to move to the rear brakes. I was thinking about trying to find a new proportioning valve unless there is another fix. Any info would help. Thanks
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