Bearing heat can be transferred to the rotor but if the bearing is that hot.. You are quite likely going to know it and you are quite likely now seized up.
Bosch brakes used on Workhorse and some other chassis units are noted for stiction.. In this case moisture builds up in the caliper piston.. Causing it to "Swell" a bit and size in the caliper chamber, this makes the brakes drag and overheat big time.
The heat drives the moisture out of the piston, As it cools it returns to normal size and ...... Once again works.
There are many fixes.. Bosch came out with a new piston and workhorse (Among others) issued a recall.
This same brake however, Has been used on commercial trucks, with no issues, for many years... WHY no problems with trucks.. normal operation generates enough heat to drive the moisture out before it becomes a problem is MY Theory.. You are welcome to come up with an alternate theory.. I won't argue.
I drive my motor home at least 60 miles every two weeks in the summer, 20 2 out of 3 in the winter and have not had that problem.
There is another issue.. This one bit me on a car
The brake hose is a multi-layer thing, SOMETIMES the inner layer can fail in such a way it becomes a one-way valve. Allowing brake fluid to enter the cylinder and engage the brakes, but not allowing it to return to the master cylinder and tank thereon. OF course sitting in your drive waiting for you to get to it.. It leaks back.
