Quote: One thing that jumps out at me is you re-used the drum booster. A drum booster will not provide enough boost for discs in a heavy stop. It will work for normal use but not give enough braking whn you really need it.
I don't really think that's your problem, though, but it's something to investigate and correct.
I was thinking the same thing and was going to ask if the drum and disc used the same booster in a 70 up E body , I know that 66-69 B body they use a different booster.
