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Old 06-04-2003, 04:02 PM
ztoy's Avatar
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Post Proportioning valve

a friend of mine is looking for a proportioning valve for his 65 mustang. anyone here have a good to sell or know where he can locate one? he has been told they no longer make it.

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Old 06-05-2003, 06:23 AM
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I get all mine at Pick-A-Part.
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Old 06-05-2003, 06:46 AM
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could try yearone.com
or
<a href="http://johnsmustang.com/Catalog/978/" target="_blank">http://johnsmustang.com/Catalog/978/</a>
or
<a href="http://shop.store.yahoo.com/mustangplace/musbrakpropv.html" target="_blank">http://shop.store.yahoo.com/mustangplace/musbrakpropv.html</a>

all I did was a search on google, there's loads of places on the net that sell them
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Old 06-05-2003, 08:24 AM
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I was told the early mustangs had it built into the M/S, thats why I had always used them on my street rods...joe
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Old 06-05-2003, 04:31 PM
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thanks guys! I'll tell him. Seems like he could have figured it out if it was that simple.......... <img src="graemlins/evil.gif" border="0" alt="[evil]" />
but
what can you expect from a .... :o
ok, I won't say it

thanks
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Old 06-07-2003, 02:51 PM
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If it's an origional 65, there is a small one chamber master cylinder and no proportioning valve, unless it is in the distribution block. I think they were still getting the correct braking action (as poor as it was on early Mustangs) by using different size wheel clyinders in front and rear. Unless you are doing a front disc brake conversion and upgrading to a dual chamber MC, forget the proportioning valve.

Trees

[ June 07, 2003: Message edited by: trees ]</p>
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Old 06-11-2003, 01:55 PM
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You only need a proportioning valve when you have disc front, drum rear brakes. With drums on front and rear, no proportioning valve. That's why the wheel cylinder is smaller on the rear brakes -- less power to the rear. Most of the time one is used with discs/discs, but some cars just have smaller discs on the rear and/or smaller calipers. With no proportioning valve the drums could lock up early due to weight transfer and the fact that the discs are grabbing a little better than the drums. On dry pavement you'll never have a problem without a proportioning valve.

I've run older cars without prop. valves with no problem. Except that time I had to make a panic stop on a wet concrete bridge going down hill because some idiot in front of me started to speed through a yellow light then unexpectedly changed his mind at the last instant and put hi brake foot through the floor. Never thought a late 80s LTD (taxi, about 10 years ago) would put the back bumper 3' off the ground, but it will! My brakes locked all the way around, but a proportioning valve may have let me brake without locking -- at least the rears. I had to swing off the road into a parking lot to keep from hitting the taxi square in the rear. Almost ripped my left fender clean off, but I saved the rest of the car.
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