I removed my wheels and had new ones installed at the shop but when I was re-mounting the rear tire I had asked my wife to hold the brake as I torqued the rear tire. I believe she initially grabbed the front brake and pulled this one by mistake (I think). Anyways I am now at the front and noticed the calipers are closed so I can't mount the front wheel. I had initially only taken the right calper off to remove the tire so the left one is still on. I am afraid to put a screwdriver in and prior them open because I would be concerned about damaging the pads. What can I do to open the calpers up to install the wheel. Thanks for responding.