I’ve just bled my Avid Juicy 3 brakes for the first time and have an issue with the front brake. The rear one worked out ok but having bled the front on the brake lever now has no bite to it and just flops back and forth rather than popping back into position after pulling it. I’ve tried re bleeding it but this didn’t work. Anyone got any ideas? Got some Juicy Carbons to do after this…

Sounds as if your master cyliner piston may be stuck down, not sure what the cause would be without stripping it down to inspect it though, usual suspects are broken return spring, swollen seals due to wrong fluid/careless use of spray lube,or corrosion in the bore.

i had this and it was the O ring that protects the piston seal. it had swollen due to WD40 type lube getting on it.
I managed to “fix” it by flushing it out with silicon spray.
The O ring is a 2 x 10mm od if you need to replace.
Good luck.