I was experiencing a spongy rear mini mono, so I tried bleeding it repeatedly, but was getting no power from it. When fluid started leaking from it, I took it to my LBS who fitted and serviced it with a new seal kit.
I made the school boy error of spinning the rear wheel, pulled the brake lever and the wheel stopped. Job done. Fast forward one day and tested the brake whilst actually riding the bike (lesson learned), in the Glen Tress car park and it still has a spongy feel. If I fisted the brake it would stop, but nothing like I was expecting or my front brake.
The obvious answer would be to return the bike to the LBS, but is there anything I should consider first? Can the new seals take time to bed in, does the brake need pumped more or left overnight with the lever closed? The bike had sat for a few days before it was collected.
I think the shop had missed adjusting the caliper too, so did a little trail adjustment to help things runs smoother, but still only getting 7-8 revolutions before the wheel turns to a halt. I need to look at that properly and perhaps fit another spacer to imporve adjustment.
The mini mono's replaced Avid Juicy's. The power and feel of my front brake is fantastic, I just wish I could get the rear to perform similarly.