Hard pedal

71dart318 said

For mor fluid capacity couldn't I use an MC from say late 70's dodge truck. They are 4 bolt and bigger resivoirs? Or switch to a new 2 bolt MC from something with all disks?

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It's not the capacity of the reservoirs. The big deal in this case seems to be the amount of fluid that the MC pushes to the calipers on a regular braking stroke, with the pedal ratio of the A Body. In the above linked thread, it took a 1-1/8" diameter bore MC to do the job. It'll vary with the specific calipers; so I can't tell you the exact bore needed for your combination.

BTW, when your caliper pistons were hard to push in, were they physically hard or just tricky due all the pistons? If the latter, then maybe they are not such an issue. But if they were physically hard, then I'd be suspicious. In all the calipers rebuilds I have done, I can push the pistons in all the way by hand with no problems.