They are dual piston ATE calipers, probably exactly the same as the
Porsche (and anything else European).
Very easy.
GENTLE use of compressed air works, but I usually just free the stuck
piston up with the brake pedal (remove that pad only, it will pop
loose) then use two screwdrivers or two small prybars to lift the
piston out after pulling off the doubtless roasted dust boot.
Go gently with the vise grips -- they will collapse the line and
fitting otherwise, and it will be REALLY stuck once it's not round
anymore. They are 11mm, by the way, so good luck finding a line
wrench!
Peter
