Disc brakes locked

You asked about verifying you have the correct master cylinder and NAPA or Autozone.part numbers. I went through getting a new master cylinder a month agao and decided on Rockauto as the Raybestos matched EOM very close…and the brake line connections were the same size as what I had…just wanted to bolt it on.

IF you decide on a new master cylinder, you can measure what size nuts/threads you have at your master cylinder and see if an auto store near you can match it up to a cylinder they sell for disc up front and drums in the rear…the folks at the stores near me couldn't guarantee what they had for sale would match up. I decided on Raybestos #36426 at Rockauto for $66--correct for a 71 340 Duster with Disc up front and drums in the rear. I looked for a 70 340 Duster with disc up front and rear drum at Rockauto and there are Cardone for $40ish. You can look at the pictures and connection sizes and hopefully pick one that won't require you to redo your brake line to match….although if your lines were previously changed you probably want to get the right master cylinder and match the lines to it. I'm certainly no brake expert…you might be fine with a drum brake cylinder, but I went with EOM repo correct to my configuration. Good luck!