New lever fitted. Fresh new oil throughout (old oil was black…)
Decided to flush the other lever and caliper, again oil was manky black in colour, the worst I’ve ever seen.
New oil in, did a little ‘draw back’ on top syringe, and got a little air out. Lever suddenly snaps back to bar with a visible black mess inside bleed tube. 😕
I’ve now a second jammed lever.
I’ve played with one of them, the piston within lever is totally jammed. Removing them and last dregs of oil show the black gunked up oil is ‘gritty’ between my fingers.
It seems the black coating /paint has worn inside away, filling oil with gunk and grit, seizing the levers.
These brakes are a year old, M8000 XT.
Junk.
I’ve bought another Zee lever. Last time I buy shimano brakes after last years faff with three sets of leaking deals on calipers.