I recently did a complete brake job, new pads, quality rebuilt calipers, and new rotors...completely flushed brake system twice with a lesser brand brake fluid, and then bled and re-filled system with the good stuff(Castrol LMA)...car stops straight and true, just the pedal seems to not be as firm as I would like..dealer had told me recently to replace the power brake booster, but with only 64k on the car, doesn't seem to be a likely problem area..am I missing something? read something about a check valve in the brake booster...is this the culprit? thanks to all