How to ID the series of brake proportioning valve?
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How to ID the series of brake proportioning valve?
I am trying to buy replacement hard lines for my 89 formula 350. The kits are for 1st or 2nd series valve. The only info I have found is the 1st series has a fine thread and 2nd a course thread? Any thread sizes would be helpful.
Thanks in advance
Thanks in advance
Joined: Dec 2004
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From: Mile High Country !!!
Car: 1967 Camaro, 91 z28
Engine: Lb9
Transmission: M20
Axle/Gears: J65 pbr on stock posi 10bolt
Re: How to ID the series of brake proportioning valve?
Might search sofakingdom old posts . Iirc it has to do with thread and flare on the valve. If your going from drum to disc do a search for the spring available at grainger.
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Junior Member
Joined: Aug 2025
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Re: How to ID the series of brake proportioning valve?
The Right Stuff makes lines for these cars. I spoke to them and they had the thread sizes. 1st design was fine thread 10mm-1.0 2nd design was 7/16-24. Also, a company SSTubes was much cheaper than right stuff. Hope this helps someone else.
Last edited by One1nut; Aug 4, 2025 at 04:18 PM.
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