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if it leaks out the little pressure venting holes out the sides of the shifter body then its dead - seal has blown. Tends to happen when people force pressure into the system - it happens.. . The R series have a small design flaw - i say that when really its user error but if you use a syringe kit with a deep nozzle/fitting then its possible to put a hole in the compensation seal as it overlaps the fill port and gets pinched inside the body. Shimano dont sell the seals and instead replace the whole shifter - which currently is a rather long wait to have done via Madison. Just use the plastic funnel as per instructions in all cases.
neilbah
Anyone had any issues with ultegra hydros leaking at the shifter? Took mine to the LBS to bleed the brakes and afterwards it pissed half the oil out of the shifter. LBS tells me it’s a “common” problem and I may need a new shifter. My guess is they didn’t tighten the screw to seal it enough (given they’re made of cheese not a total
Surprise)
Given it was only since they touched it it was a problem (I usually bleed them myself but was lending it to someone) I’m a little suspicious.