I have read a few posts (search) on this issue but not sure what applies to a 1970, so need yr help.
First,this is a full resto, reconditioned, but all original components and new steel brake lines....I cannot get brake fluid to the back drums. I assume the proportion valve (cleaned) is the culprit and somehow needs to be reset or adjusted.
I am using a hand bleeder vac pump that pulls the air and fluid out. I also tried it w/o the bleeder pump, same result. Front disc's bled out just fine. Thanks.
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