Proportioning valve - Chevy Nova Forum
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Old 16th-November-2011, 03:31 PM   #1
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Proportioning valve

I haven't been able to get a decent pedal after installing the new discs from CPP. I have a corvette master cylinder and a new rear brake line that connects to the original rear brake line through a Jegs Prop Valve...

http://www.jegs.com/i/JEGS-Performan...63020/10002/-1

I plumbed it this way only because a member advised me to do it this way when I originally converted to a Dual Master Cylinder. I'm not sure if its the correct way or the best way to run a proportioning valve but I'm willing to redo it if necessary as I don't want to cut any corners. I can't help but notice that most cars with Disk brakes have a prop valve under the Master Cylinder which may be a better setup (?) Also I didnt install a check valve which I understand may be needed depending upon the bore of the master cylinder as I have drum brakes in the rear.

I'm wondering if I should keep the adjustable prop valve or go with a different setup?

Nick
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Old 16th-November-2011, 06:07 PM   #2
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Typically, a corvette master cylinder is for front and rear disks. mine has disk front, drum rear and a early to mid 70's GM mid size disk brake master cyl. I'm using the proprtioning valve from a late 80's S10.
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Old 16th-November-2011, 06:26 PM   #3
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So with the Vette M/C that is made for Disk/Disks would you need a prop valve if you had Disk/Disk set up. I'm doing a Disk/Disk set up with the Vette M/C and read something about using an adjustable valve just for the rear brakes. I was thinking about getting a combo distribution/prop valve. any thoughts on that.
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Old 16th-November-2011, 07:16 PM   #4
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Quote:
Originally Posted by nova64000 View Post
I haven't been able to get a decent pedal after installing the new discs from CPP. I have a corvette master cylinder and a new rear brake line that connects to the original rear brake line through a Jegs Prop Valve...

http://www.jegs.com/i/JEGS-Performan...63020/10002/-1

I plumbed it this way only because a member advised me to do it this way when I originally converted to a Dual Master Cylinder. I'm not sure if its the correct way or the best way to run a proportioning valve but I'm willing to redo it if necessary as I don't want to cut any corners. I can't help but notice that most cars with Disk brakes have a prop valve under the Master Cylinder which may be a better setup (?) Also I didnt install a check valve which I understand may be needed depending upon the bore of the master cylinder as I have drum brakes in the rear.

I'm wondering if I should keep the adjustable prop valve or go with a different setup?

Nick
I think what you might be experiencing is due to the lack of a residual pressure valve from the master cylinder to the rear brakes.
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Old 16th-November-2011, 08:12 PM   #5
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Thats what I thought. I was told that it depends on the bore of the master cylinder... I'm going to try that first before anything else
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Old 16th-November-2011, 09:41 PM   #6
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...I was told that it depends on the bore of the master cylinder...
No, the disk/disk brake master cylinder does not have the residual pressure valve like the drum master cylinders. I would try a 10 lbs. residual pressure valve.
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Old 16th-November-2011, 10:03 PM   #7
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I installed a residual pressure valve when I did my 71 disc brake conversion. I have heard you don't need one as long as your master cylinder is up on the fiewall. I didn't do anything at all with a proportioning valve.
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Old 16th-November-2011, 10:32 PM   #8
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Quote:
Originally Posted by Vin63 View Post
No, the disk/disk brake master cylinder does not have the residual pressure valve like the drum master cylinders. I would try a 10 lbs. residual pressure valve.
I run a disc/disc setup, but when I was putting my setup together I was told the same as above, the Vett master would require a residual pressure valve, when used with a disc/drum setup. They come in a few different increments, but I would say a 10lbs is a good starting point too. We also use a similar adjustable prop valve as the one you posted too.
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