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Old 12-31-2002, 05:42 AM
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Post porportioning valve

I have converted a 69 chev 1/2 ton with manual drum brakes to 72 power disk brakes. All parts are new except the porportioning valve. I do not have any pressure to the front disks. Do I need a new valve or an adjustable one?

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Old 12-31-2002, 06:40 AM
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Did you use a new master cyl & brake hoses? I'd crack open the brake line entering the combination valve & see if you are getting fluid to it......Don
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Old 12-31-2002, 03:28 PM
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I had to bleed the prop. valve a couple of times before I got the system to bleed out totaly. For some reason the whole system would not bleed out normally. It just locked up and I could not get fluid thru to all the bleeders. after much screwing around I bled the prop valve and then I started to get fluid.....GlennK
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Old 12-31-2002, 04:26 PM
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May not be your problem, but sometimes, the proportioning valve gets off center when you are bleeding, try kicking the pedal very hard once to center the valve.
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Old 12-31-2002, 09:11 PM
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did you change the distribution block on the frame?from the 69 to the 72?I recall that the 69 had a proportioning valve by the master cylinder,then a block on or by the frame,where all the lines hook up to,Make sure you use the 72 distribution/proportioning valve,this is dual fuction.this could be your problem. Good Luck
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Old 01-01-2003, 06:15 AM
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The porportioning valve is different for drum/drum and disc/drum. If you get a spongy padal change out the valve for the correct one.

Todd
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