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Post up a photo. Vtl is probably on the right track but being on the E90 forum, i've never seen an E90 with a caliper handbrake.
Other possibility is the piston has popped out all the way and you guys are trying to drive it in wonky or it is sitting on the edge of the bore. But that is a bit farfetched.
Even if it has popped out, just buy a rebuild kit and take the caliper off to a brake shop and get them to rebuild it for you. Push down and hold the brake pedal down with some wood or a jack stand to avoid emptying the fluid reservoir and causing more problems
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