I used this unit on my wife's 68 Firebird and the brakes worked very well. That valve is called a Proportioning Valve. There should be no leakage from any component on a breaking system. Sorry I'm not much help to you. Here is a brief description of the valve.
https://piratejack.net/template/img/...vqfsFdAC2yRiDz
This is a post from someone that had issues with a leaking unit.
Direct fit for a 1969 Firebird 400. No issues, installed as OE, appears OE, works like OE. The old one leaked out the front "button" under the rubber cap. Do not fear, although the service manual says to "press" the button when bleeding, this is a misprint in the service manual. Install it and have someone press the brake pedal hard and the button will move forward. Impossible to press it in as at rest its already in. This replacement works perfect and often repairs the issue of air getting into the brakes from the old button seal. Pull the rubber cap, see if its wet under there, if so replace. See in button moves forward when you press the brakes hard, if not, also replace it. This same part was cheaper than other Pontiac parts suppliers for the same part.
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68 Firebird. IA2 block, 505 cu in, SD Performance E-head, Solid roller 3600 weight. Reid TH400 3:90 gear. 28" slick.
Best so far 9.95@135 mph. 1.39 60 ft.
76 Trans am, TKX .81 o/d, 3.73 Moser rearend,
468 with KRE D-ports, Doug headers, 3" Exhaust
950 Quickfuel.
Last edited by chuckies76ta; 04-17-2025 at 08:29 AM.
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