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Old 12-26-2015, 12:50 PM   #1
Tom Goldman
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Default Re: Porportioning Valve

Tony didn't say what car he's doing this on ,or if he's using an OEM master cylinder .
Many older disc drum cars have integral residual valves ,either in the master cyl itself ,or in the factory combination/proportion valve that can cause excessive brake drag when being converted from drum to disc .
When making major system changes like this ,it's best to replace the master cylinder and the factory distribution block with parts that are sized properly for the application , particularly if the car will be foot braked .
On several of the Stockers I've built I've used Bias valves on the front brakes , not the rear,to proportion proper braking , especially at the finishline.
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Last edited by Tom Goldman; 12-26-2015 at 12:53 PM.
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Old 12-26-2015, 03:45 PM   #2
Tony Goodman
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Default Re: Porportioning Valve

All the factory stuff is gone. Have a 1.030 strange master cylinder, I don't know if I need a bigger one. Sounds like I probably should upgrade to the bigger master cylinder also. I want to do it right, but not spend money on things I don't need.
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Old 12-26-2015, 04:49 PM   #3
Greg Hill
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Default Re: Porportioning Valve

Quote:
Originally Posted by Tony Goodman View Post
All the factory stuff is gone. Have a 1.030 strange master cylinder, I don't know if I need a bigger one. Sounds like I probably should upgrade to the bigger master cylinder also. I want to do it right, but not spend money on things I don't need.
Tony, I think you should go with the 1 1/8 bore MC from strange. I believe you will have too soft a pedal with your current MC.
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Old 12-27-2015, 03:06 PM   #4
Tom Meyer
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Default Re: Porportioning Valve

What kind of a car is it? Might have to move where the rod attaches to the pedal to get better pressures with a footbrake car. Tom
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Old 12-27-2015, 08:54 PM   #5
Todd Geisler
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Default Re: Porportioning Valve

Just got my new brakes from Lamb. In conversations with Roger he told me a few things.

1. he does not believe in reducing front brake pressure via an adjustable proportioning valve.

2. for 4 wheel discs, 4 piston caliper they recommend a 1 1/8" master cylinder.

I can tell you from my experience building cars, we never use residual pressure valves on cars where the master cylinder is on the firewall. The RPV is only used when the master cylinder is mounted on the floor.
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Old 12-28-2015, 05:15 PM   #6
Tony Goodman
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Default Re: Porportioning Valve

Thanks for the responses from everyone! I'm going to up grade the M/C to a 1.125 bore, and not use a proportioning valve. Thanks Tony
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