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Old 03-10-2005, 05:29 PM
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Residual Pressure Valve useful?

Is there any advantage to using residual pressure valves fore and aft when your master cylinder is located at nearly normal height on the firewall rather than at frame height (where they are definitely necessary).

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Old 03-10-2005, 05:45 PM
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I don't know if this is correct or not, but:
I run a 2lb Residual valve on my front discs, and a 10lb on the rear drums.
I have a 7" booster with a Corvette MC, normal mounting.
Seems to work fine.
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Old 03-10-2005, 10:14 PM
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I did a disc brake convertion on my 66 Impala and did not use a residual valve on either front or rear lines. I did use a proportioning vavle..... And I have the original firewall mount for the MC...

If you have to pump the pedal a couple of times to get the pedal to be firm then I would say you need a residual valve. But if your brake pedal if solid with out having to pump then you should be good to go....
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Old 03-12-2005, 07:10 AM

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In theory, as long as the MC is above the calipers/wheel cylinders, residual valves are not necessary. If you are approaching the near level point, then by all means use the valves. Here in the mountains, it possible to change that level enough for concern!! I have a remote reservoir installed supporting an under floor MC and thought this would be enough "head pressure" to let me omit the residual valves. I did have so-so brakes, but they improved when I installed the residual valves.

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