The dual master does offer some protection against a line or wheel cylinder or caliper failure. Today these are very unusual events but when our single master trucks were new it was common enough that the concern turned dual masters into a legal requirement.

My own feeling is that if you have replaced every line and cylinder in your original single master system, and are going to honor the original service cycles you are probably fine with a single master.

Otherwise the dual master is cheap insurance against no pedal and no brakes.


1955 1st GMC Suburban | 1954 GMC 250 trailer puller project | 1954 GMC 250 Hydra-Matic | 1954 Chevy 3100 . 1947 Chevy COE | and more...
It's true. I really don't do anything but browse the Internet looking for trouble...