I've got a set of 07 xtr brakes on my bike and I need some advice with the front brake. I regularly clean the pistons by slightly squeezing them out and then cleaning them with Q-tips. Some times I will use rubbing alcohol which is ethanol on the Q-tips sometimes not. I then put a drop or two of mineral oil on the pistons and push them back in. This has always worked in the past but now I have an issue since I did this. It seems like in use the pistons are not going back in all the way and the brake lever is pumped up nearly all the way out. It doesn't start out this way on the ride but very soon into it I only have about 1/4 inch of lever before the pads make contact. Braking power also sucks. Maybe I somehow introduced air into the system. I have repeated the cleaning process twice and still the same. I figure I am looking at a bleed. Any advice would be appreciated.
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