Bicycles Stack Exchange is a question and answer site for people who build and repair bicycles, people who train cycling, or commute on bicycles. It only takes a minute to sign up.
Sign up to join this community
I have a bike from early 2016 with Shimano BR-RS805 hydraulic disc calipers.
These need to be replaced, but are discontinued, and newer road/cross/gravel offerings from Shimano use BH90 hoses, while BR-RS805 uses BH59.
The levers are ST-RS785 Di2.
I don't mind another brand as long as they fit (flat-mount 140 mm rear (but I could use a wedge, and change to 160 mm), 160 mm front).
It is regularly stated that almost all Shimano hydraulic calipers are interchangeable excluding perhaps the DH ones, Saint, Zee etc. Therefore, you can choose one suitable for your frame and be sure it will work with your current lever.
It is important that you use the correct olive and barb for the hose you are using as there are some small differences to the inner and outer dimensions of the different shimano hoses.
There are also aftermarket calipers available by eg. Hope that have their own benefits and drawbacks.
