brakes

[flip66]

I have noticed that there are 2 different types of brake master cylinders on the 69-72 trucks with power brakes. Some of them have the large reservoir in front and a small in the rear. There is another one where the reservoirs are the same size. It looks like the power drums have the lager reservoir in the front and the disc setup has the same size reservoir. I have converted front drum to front disc I have the 72 power booster and I have the master cylinder with the large front reservoir that the parts store showed to be a 72 but they also show the other to be a 72. I was wondering what Ya’lls experience with them is. And which one is seen most on trucks disc.