I am the source of jbarber's technique...
for freeing up stuck pistons. This is an adaptation of a Magura technique I read on some magura users group website. I have a small clamp that I use to hold one piston, while I push the other one out pretty far. Then the WD-40 seems to work the best for cleaning out the accumulated dirt. I tried Triflow but that did not work for me. I alternate clamping in each piston and then pushing other one out, and cleaning, then mashing in again. Sometimes this does not work, and has to be repeated, but seems to be the best remedy and I do it at least 2x per year on my Magura Martas. Once I get them clean and working good, if the rotors are not bent, they do not rub.
On Avid's, Caveman's suggestion for aligning is a good suggestion. That is not an option for other brands. But this technique for cleaning seems to work, most of the time.
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