The best bicycle brakes I have used are Hope V4 mountain bike brakes. Meant for downhill racing, they have good modulation and excellent power with a 203 mm disk.
They are easily removed from the bars and fork and can be packed into a container tor flying. Pad wear is pretty good, and pads are available at a reasonable price. Bleeding them uses same tools as automobile.
May be difficult to use with drop bars. For a flat bar touring bike, they are excellent.