This surprises me a bit. I drove mine up and down Pikes Peak without the problems you mention. I put it into low and barely touched the brakes. About halfway down they check your brakes, and commented about how cool mine were. No I don't remember the temp.
It's been a while, but I don't think I was going 10
mph. I have found, though, that if you are going fast it doesn't tend to slow you down. I had to slow myself down and then it seemed to hold the speed fairly well.
That road has some good dropoffs that I didn't want to visit.

2005 Ford Escape Hybrid - Titanium Green, 4WD, Appearance Pkg, Leather, Nav System