There is NO blockage when schuttle shifts left or right. Only brake light on dash id effected.
What system do you have?
Factory Front disc, rear drums which means a booster.
A non booster system with front disc/rear drums, which did not exist in 70.
Is it the master, distribution block, improper plumbing.
Which booster if you have one? A stock type factory, or a will fit "if" booster that is supplied by MANY aftermarket suppliers that have different bolt patterns, different bore depths in master, ON and ON. All these are factors.
OLD saying. One size does not fit all.
Last edited by CHOCK; 09-20-2019 at 06:23 PM.