While looking into brakes for our '53, I was told master cylinders put out different pressures depending on brake type, drum vs. disc.
The issue with vacuum assist is apparently clearance with the manual transmission side linkage typically, which is why most say they only work WITH an automatic transmission, or likely with a floor shift manual.
Not sure about axle/caliper clearance. I decided to stick with drums all around for now but ordered a dual master cylinder for a little extra safety.
Last edited by Lindsey; Fri May 24 2019 07:24 PM.