Join Date: Nov 1999
Location: Central California, USA
Re: Proportioning Valve inputs needed
If the valve has all the brake lines running into and out of it it's a combo valve from a later model car, common in conversions. You can either replace it with new, or bypass it and run an adjustable proportioning valve in the rear line only. I'd remove any pressure gage, it won't tell you anything unless you have one in both front and rear lines, and you adjust the brakes by feel anyway, not the gage. The gage is a possible leak or failure source and should not be used unless it has a definite purpose to serve, - in my opinion.
If it's a separate roundish valve with big nut and is above the brake light switch/splitter, then it's a hold off valve for the front brakes. You can remove this valve with no problems or adjustments. I have a full explanation of this valve on my web page below.
I'm in Salinas too, we'll have to meet some time.
Check my web page for First Gen Camaro suspension info:
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67 RS 327 original owner. 1965 Lola T-70