I think a better "rule of thumb" would be that both the left and right front calipers and discs/rotors should be close to the same temperature regardless of the driving pattern. The same goes for the rear left and rights being somewhat close in temperature. If one side or one brake caliper and disc are higher or colder than the others it generally mean that brake has an issue. Could be as simple as a bad flex line or sticking caliper pistons. Replacing very worn brake pads and keeping the same (original?) calipers usually means the caliper piston(s) extend out far and get corrosion or dirt on them and when pushed back in for the new thicker brake pads they tend to stick. Doesn't mean they don't work stopping most means they don't retract back far enough to not drag. Usually quicker and cheaper to replace the caliper and move on.