I'm doing the rotors/pads on my Cayenne S and have a problem. When pulling off the front caliper one of the pistons popped out. I accidentally left the motive bleeder pressurized so I'm thinking thats what did it. If you guys have any tips on getting the piston back in please let me know.

 

it should just slide back into the ring and remember
cleanleness is next to godliness.