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Yes, there's a rubber seal in between the caliper and pistons. When you remove the caliper off the fork, remove the brake pads, inspect them for even wear. Also, inspect your slide pin. Crud may have gotten under the rubber boot and rusted the pin. Use a good grease for the pins after you clean them.
Pump on the brake lever to push the piston out enough to get to the crud and clean it off. You may need a scotch pad or steel wool depending on how bad it is. Brake cleaner is your friend. When pushing the piston back in, I'll crack the bleeder screw to relieve the pressure and then top of the brake fluid.
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