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Old 06-10-2009, 08:49 PM
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Disc/drum Master Cylinder

I have a 55 Chevy 1st series pickup that I installed a AMC Pacer IFS on. Along with the IFS came manual disc brakes. In the rear I have an AMC 20 rearend with drum brakes (I know, odd choice). Currently, I basically just hooked the stock brake lines onto the axles and called it a day. The truck stops, but tends to lock up the wheels pretty easily if I need to stop in a hurry.

Is this because I need a new master cylinder? I would assume the stock MC that is in it is for the original drum/drum setup.

Also, if a disc/drum MC is what I need, any suggestions on where to pick one up?

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Old 06-10-2009, 09:12 PM
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I believe I would install a Wilwood proportioning valve ... like this



About 40 dollars ...

I have one on my 1932 3W Ford coupe



It allows you to balance the amount of fluid pressure to the front / rear bias
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Old 06-11-2009, 01:17 PM
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So that should take care of it even with the stock master cylinder? Sounds good to me.

Any reason the Wilwood valve is better than the purple Speedway motors one? They look pretty identical externally anyway, and the Speedway one is a little cheaper. I'm not concerned with color since it will be under the truck anyway.

Thanks!
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Old 06-11-2009, 01:27 PM
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I G U E S S that the Speedway brand is as good but for a few dollars ... WHY GUESS ?

Wilwood has a great reputation for quality
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Old 06-11-2009, 01:48 PM
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If it's the (rear) wheels that are locking up the Prop valve will cure it.
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Old 06-11-2009, 03:45 PM
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The summit prop. valve is made by Wilwood and costs a few bucks less. If you are looking to save a bit of money it is the way to go. I bet Wilwood makes the Speedway one too...but purple

http://summitracing.com/parts/SUM-G3905/
http://summitracing.com/parts/WIL-260-8419/
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Old 06-11-2009, 05:38 PM
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Just me ... and MY 3 or 4 dollars ... but I believe that the " other name " stuff is built to a spec for those folks and I do not care to gamble with something as important as brakes ... for a measly 4 dollars.

Some of the other stuff Speedway and Summit sells is just not as good as the name brand stuff IMHO.

King Chrome and Mr Roadster comes to mind.
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