going back to manual disc brakes from power

Newbomb Turk said

I’ll have to look in my 1973 FSM and see what it says.

My memory is at least up to 1972 they were 1 1/32.

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Yes. On the 74 it was. And on my manual disc 70’ duster.
15/16 bore equates to a longer softer travel/pedal but better clamping force. The larger bore masters equate to firmer higher pedal but less clamping force.