Rod,

Put her back on the lift again & remove the caliper from the disc. Compress the piston all the way & then pump it back out a little with the brake pedal (not too far). Compress it again. All OK???

Now make sure the caliper is traveling along the guides OK. Clean up the entire caliper as best you can with a wire brush & compressed air. Lube the guides (even put a little grease down in the holes where the guides go. Slide the calipers in & out a few times to make sure the travel is still smooth.

Put her all back together & take her for a test drive. Let us know how it all works out.

My rear calipers are starting to stick from time to time too. It may be time for replacement but for now I'm nursing them along as long as I can.

Tom