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Only one piston moving

edited April 2017 in MTB workshop & tech
Hi all, I took my bike out the other day after about 2 years in a shed, and have been working on it to get it back to good condition. My rear brake is a Magura Louise, and on inspection only one piston moves when I squeeze the brake. I've applied pressure to the working piston to force the non-moving one out, but it still doesn't move when I don't put pressure on the working one (I.e. Use it normally) . So my question is, does the brake need bleeding/calliper need rebuilding?

Any help at all is appreciated hugely, cheers


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