Hi, I recently bought a pair of brand new '05 lever. I received them, unpaked them, filed the part to prevent it from cracking it, completely and carefully cleaned it after that operation, bled it in the sink with a syringe and making the lever clap two or three times.
I then put them on the bike and after 5 rides with them, it started to become weird, I had to turn the TPA very often, so after further observation, there was some water on the piston. It was then clear that I had a leak at the piston for sure! I then completely unbuilt the lever, cleaned everything, put some grease around the piston and rebled it. But then, it started again.
My question is: what makes this happen and what can I do to repair it?
Thank you very much.