Dont disc brakes have an issue of heating up, and then stopping working properly when they are hot?
this might perhaps be an issue for braking on long descents. Not sure though.
any issue with disc brakes heating up is incomparable with a rubber block rubbing against your rim - rim brakes deteriorate, become grabbier as they heat up, then your blocks wear down real quick. I've never really had any trouble with disc performance, they do heat up but have never failed me. Lever feel changes a little but thats it, and that's mountain biking too, i don't know about you but I'm alot lighter with the brakes on tarmac.
any issue with disc brakes heating up is incomparable with a rubber block rubbing against your rim - rim brakes deteriorate, become grabbier as they heat up, then your blocks wear down real quick. I've never really had any trouble with disc performance, they do heat up but have never failed me. Lever feel changes a little but thats it, and that's mountain biking too, i don't know about you but I'm alot lighter with the brakes on tarmac.