About 6 months ago I:
- took my bike off the trainer
- placed the bike upside down on the floor
- stepped over to handlebars to grab a wheel
- and broke a shift lever!
My doctor is pretty sure I fractured my middle toe:
Kung Fu Panda good times!
Anyways, bike came with BR-RS785 brakes and ST-RS685 shift/brake levers. Got a deal on ST-R7020 and according to the compatibility chart:
Source: 2022-2023 SHIMANO Product Information Web
I only replaced:
- the shift/brake levers with new ST-R7020 105 series
- the BH59 brake hoses with BH90
Believe my LBS used the old barbs.
Okay so the local bike shop replaced the brake hoses and bled the system, and… I could pull the lever all the way to the bar. So they bled it again, and… better but clearly wasn’t giving me confidence. So I was pretty unhappy.
At the same time I needed bearings replaced in a DT-Swiss rear hub and I asked the LBS if they wanted to try. That wasn’t going particular well, so my buddy said “go to that bike shop across town, they have an ex-pro tour mechanic.”
Long story short, I forgot to tell the ex-pro mechanic about the squishy brakes but he noticed it on the post bearing replacement test ride. And he fixed it. And forget to tell me he fixed it. But he obviously fixed it because the brakes were back to normal.
Hope that helps.