Back right pistons? I believe there is only one piston per caliper on integras. The piston can't get pushed out while installed. It pushes against the brake pad with force from the fluid. Maybe it got stuck in, in which case you should either take the caliper off and jiggle it around, try to push it out so it moves freely, or replace the caliper. Another idea, if the brake pedal goes to the floor it could be a leaking master cylinder. :dunno: That's what my teg had.