I have a set of XTR-966 shifter/brake levers on my xc bike. They're getting on a bit, and the rear brake is having an issue. When you pull quickly on the brake lever, it does activate the brake, but not that hard, and then as you continue to pull, the lever keeps on traveling and bottoms out.
I've tried bleeding the brakes again, and they're fine (I have bled a dozen sets of Shimano brakes over the years, and am pretty sure it's not my bleed method).
All I can think of, is that the lever piston has a gap between itself and the wall, so if you push quickly, it'll brake, but then the fluid begins to leak back past the lever piston into the reservoir, and the brake force decreases.
1) Has anyone seen this too?
2) Is there a solution? I've not looked at pulling it apart yet (and infact the bike is not accessible to me right now, so I'm just trying to get some info and formulate a plan before I get back to the bike).
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