When the engine is off, pedal feel is good and solid. No air coming out of the bleed nipples, everything seems to be bled properly.
When the engine's running though the pedal feels really soft. It doesn't sink or anything and I can stand on it without it moving.
My first thought is air but i've bled the system through and no more is coming out. The O/S rear caliper is sticking on though, could this cause spongeyness if it isn't retracting?
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Bye bye Sundance Kid

cwspellowe
My pedal feel was crap for a while and did seem to get better once I had free'd up a sticky rear piston that would not wind in at all, I took the dust cover off, removed one pad and pumped the brake, this popped the piston out far enough to clean but not too far as to lose fluid, cleaned up said cruddy piston which wound in with no problems then and the pedal feel improved

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