Take the caliper off the bike, but do not disconnect the hose unless you are going to renew oil and bleed. Remove the pads and pump the pistons out slightly. Not too far now. Clean around the pistons with a cotton wool bud and some clean brake fluid. Push the pistons back in. Pump them out again and repeat until they feel freer. Clean the body of the caliper, where the pads normally go with a toothbruck or similar. If you are using oil (like WD40) or brake fluid to do this make sure you spray liberally with brake cleaner. You don't want this on the disks or pads. Pop you pads back in, fix back on the bike and pump the lever a few times.
If this don't sort it then you "may" need a new seal kit. :?
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