brake help

hamsterhats said
ok, changed the front pads, the wear is one sided only. The outer pads are worn twice as much as the inner. I am assuming that the piston is in need of some work. Found my idle and braking problem, bad booster, when plugged the motor runs smooth as silk. Anyways, is it hard to rebuild the piston and assembly? Any input appreciated!
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rebuilding a caliper is easy. Unfortunately the rebuild kits can cost almost as much as a new caliper.

The problem could also be a partially plugged flex line, where pressure on the pedal is enough to engage the brakes but the plugged lined prevents the fluid from returning an relieving pressure on the caliper.