Brake Caliper Piston Won't Fully Retract?

Hi

So my other half has an E85 and her brakes are squealing a little. I bought new pads as they only had a little material left on the existing ones.

I removed the cap on the reservoir and proceeded to push the caliper piston back to accommodate the new pads.

I got to a point where it was almost back but the piston was sitting about 5mm proud of the rubber surround and it refused to go fully back, regardless of how much pressure I used.

This was on both sides, virtually the same amount back to where it stopped!

Have I missed something here? Having changed umpteen brake pads, I have never had both sides refuse to retract fully.

Basically, with the new pads the caliper would't go back on, I probably needed another 5mm which suggested the piston needed to go back further. It went back fairly easily to a point, then nothing.

Ta
 
Try opening the bleed nipple on the caliper a little. Sometimes the fluid struggles to go back through the master cylinder.
 
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