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I had a set of M785 brakes, didn’t use anything but Shimano oil and they never lost a drop in 18 months, but first pull was a bit of a mystery pull you could slow, or just find the bar, nothing I did could fix it, but after a few months it was literally just the first pull, they’d be consistent for the rest of the day, I got in the habit of pumping them up before I started, finally the plastic thing in the lever that is something to do with the bite point adjust failed. I had a set of M615 brakes, they were faultless, bombproof, but lacked a bit of power, well until I stupidly bought a pot of Halfords mineral oil and a month later they leaked from everywhere they could leak from. Question is, if they know these problems exist.
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