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  #1  
Old July 3rd 2005, 16:13
TOW74 TOW74 is offline
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proportioning valve

What's up Everyone?

What is a proportioning valve for? , and do I realy nead it with the porsche 944 brake conversion? I have 1974 1303 and I am converting the stock brakes to porsche. Thanks, TOW74
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  #2  
Old July 3rd 2005, 18:57
puma-Alex puma-Alex is offline
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The valve will let you adjust the brake " bias " front / rear . If placed in series with the rear brake line , you can adjust the pressure for the rear calippers , and if on the front , vice versa .
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  #3  
Old July 3rd 2005, 20:59
flat flat is offline
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A proportioning valve is silmilar to a pneumatic pressure regulator. Upto a certain pressure (the knee point) the prop valve lets the pressure increase at without regulation. When you reach the knee point, the pressure increase is regulated (smaller slope, graphically speaking). So, you can only reduce pressure with a prop valve.

If you have a vehicle where the rear brakes lock before the front, then you can add a prop valve to the rear circuit to balance the beast. If your front locks up first, then you have more problems. It is illegal in most places to regulate the front circuit of a braking system. Check your local laws before trying a prop valve in the front.

For a balanced vehicle, you want the fronts to lock up JUST (did I mention JUST) before the rears. Understeer is easier to control than oversteer.

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  #4  
Old July 4th 2005, 11:14
TOW74 TOW74 is offline
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Thanks for your help guys,

Were can I buy one in case I have that problem? I'm located in the US. Thanks, TOW74
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  #5  
Old July 4th 2005, 23:47
flat flat is offline
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Wilwood make a nice one. It's set up for 1/8NPT fittings, but they sell the adaptors for metric bubble flare seperately. Any speed shop should sell it, like Summit or Jegs.

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  #6  
Old July 5th 2005, 06:52
TOW74 TOW74 is offline
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Thanks Flat,

I'm going to go to there web sites and take a look. Peace! :agree:
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  #7  
Old July 5th 2005, 10:07
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oicdn oicdn is offline
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Check out eBay. just type in proportioning valve They're like $1-2 cheaper ($38 instead of $39) and some of them are free shipping.....
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