my mechanic friend just replaced the disks and pads on the back of my 02 2.2dti and everything went well until........

we drove home and the disk was smoking and hot as hell. It turned out that the caliper sliders had jammed solid and wasn't allowing the caliper to release.

I drove it back to him and he stripped the one that was sticking, he cleaned it out and packed it with copper grease, cleaned the sliders up and reassembled.

it not sticking but its rubbing alot more than the other side when you spin the back wheels.

can anyone suggest what to do?