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Old 05-27-2022, 11:15 AM   #2
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Join Date: Jan 2013
Location: Simi Valley, CA
Posts: 8,216
Re: Plug for 71-72 combination/proportioning valve

It's a bleeder screw. There is no seat for a flared brake line in that hole. Not sure what a '71-'72 combo valve looks like at this point. I ended up removing mine and putting a Wilwood valve in for the rear brakes on my truck.

'70 Chevy 3/4T Longhorn CST 402/400/3.56 Custom Camper

Simi Valley, CA
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