Needing to know what master cylinder to use for manual front disk brakes on a 1969 roadrunner. Also when converting to manual disk does the master just mount to the fire wall or is there an adapter plate to take place of the booster?
There was no manual disc brake option on '69 roadrunners, however in 1970 there was a manual disc brake option on B body Mopars for taxi cabs. This is a standard disc brake master cylinder of the era with outlets facing toward the inner fender, with the addition of a pushrod and mounting studs. There is an aftermarket version of the MC available, Raybestos MC36283. You'd need a pushrod and mounting studs, which should be fairly easy to find used. As for the mounting, there is a mounting plate that goes on the firewall. I assume the one used on manual disc is same as that used on manual drum?
If original appearance isn't important, Dr Diff probably has a setup available that uses a late 70s early 80s Mopar master cylinder, adapter plate and adjustable pushrod ready to bolt on.