I need help replacing disc brakes in my 2006 Honda Accord.?
 

I was able to remove the actual brake pads from the rear but I am unable to depress the piston that holds the pads on. I used a C-Clamp but that is not working. I also tried loosening the bleeder valve and it still would not go in. I can not get the pads on unless the piston goes in. Is there a key to doing this. Do I need to loosen any bolts or anything. ANy suggestions would be greatly appreciated. Thank You

Remove the bleeder valve, use the old pad and c-clamp to depress the piston. Check the bleeder valve for obstruction. Most of the time you can clean the passages with some fine steel wire and ruse the bleeders. If the bleeder port in the caliper is obstructed a small drill bit will usually clean the junk out. Usually rust. Do NOT use any penetrating oil or similar product.