It would not have mattered anyway, you cannot pop all four pistons from the caliper with the brake master cylinder- one invariably moves a bit farther and once any single piston is beyond its seal the system will not move the other pistons because all the fluid just runs out of the caliper hole without the piston.
As Lather said, compressed air works best. Just cover everything with a rag and be careful because the pistons may come out with some speed and force. Cover everything with a rag or several rags and keep you face pointed away from the caliper while you use compressed air to push the pistons out. Once one piston is out, just hold it against the seals (it does not have to be inserted into the caliper) to stop the huge leak and another shot of compressed air will move the other piston out.
Again, as Lather said, put the air nozzle against the transfer hole in the face of each caliper half (after you take the calipers apart). Also, hold your thumb with a rag over the hose hole on the outer caliper so you can pressurize the caliper half or all the air will escape out that hole.
You may be able to find something that will reach inside the pistons, expand, and be able to remove them- something like a battery terminal expander comes to mind. DO NOT grab the outside of the pistons and do not grab a lip of the piston- if you try to get them out mechanically, only touch the inside of the pistons. Also do not use a lot of force because the pistons are easy to distort and after that they will be useless.
An air compressor really is handy to work around motorcycles / autos though. It is not necessary but it makes some things much easier, like replacing handlebar grips and removing caliper pistons.
Brian
Can Someone fill in the blank please. THink i was moving to fast and shoulda removed the cylinders by engaging brake and letting them pop out. At this point the calipers (front) are removed from bike, torx bolts removed...and pistons inplace. Read the manual and it suggested using compressed air...where to stick the hose? Also guess I need to buy a compressed air unit now, or is there another way of popping them out?
