I changed my rear brake pads on my Honda Accord I-CTDI, I used copper grease between the pads and the caliper, and put some silicone grease on the piston so that the dust cover seal wouldn't spin around when winding the caliper back in. All seemed to be working fine, but I now suspect that the O/S rear caliper isn't operating. After road testing the front brakes had heat in them and so did the rear N/S disc, however the O/S rear was cool. I think the rear piston maybe stick, because the caliper pins are free and the pads are fitting perfectly, can move the way they should. Any ideas what I could try to fix this?