1966 Valiant - Power or manual disk brakes?

There is a lot of personal preference here. A larger diameter MC gives shorter throw but a more firm pedal feel. Smaller diameter gives a longer pedal throw but less stiff. Opinions are all over the place but after reading a LOT I went with a 15/16 manual MC for the same car and same brakes.

I can't think why power brakes would be needed on an early A unless there was physical leg weakness that needed belp.