I have a leak in my Shimano DA 9170 (right) shifter. When I do a bleed, everything seems to work for a ride or two and then I start to lose braking power and the underside of the brake hood is wet with mineral oil.

Upon further inspection, I found this open port. On the other lever, this port has a black cover with a material similar to electrical tape.

Note: this is not the port with the bleed screw. That is further back on this model

Any advice?enter image description here

  • When did the leaks start? Was there any event that can be associated with the starting of the leaks? What was the reason for the first bleed?
    – calofr
    Jun 12, 2023 at 12:54
  • Try refilling the system and squeezing the lever with the hood pulled back. Is the oil leaking from that hole, or somewhere else? Also, perhaps related: bicycles.stackexchange.com/questions/85559/…
    – MaplePanda
    Jun 12, 2023 at 13:09


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