Yes, I have thought about upgrading to hydraulic braking.
But for me the downsides did not justify that.
- special tools needed for filling oil and performing service
- I cannot do it by myself
- repair: with cable it will work somehow, even if something is loose. I can fix it anytime, also on the road
- installation: I would have to replaced only the wire, but the Bowden cable also. Which is something I did not want to do because of keeping everything sealed against water inside of the scooter
- cost: it is more expensive. Just for trying out if it would work out with 140 mm disc it was not worth it.
The extra braking power is not needed. The problem here is the tire. So there would be no benefit like on the "real" bike.
There also is no heat problem or fading in my driving profile.
Only benefit would be the dual-activated caliper and the self-adjustment of the brake.
But at the moment I could not see that as an downside so far. The braking on the scooter is a lot different than on my 29' MTB
Maybe later I would upgrade this too, but not for the moment.
In the picture you can see the beta version of the final adapter. It would enable mounting any brake caliper.
Final adjustments could be made for the positioning of the holes and so on. But it works for now.