Do airliners or business jets have brake temperature sensors?
Brake temperature sensors are quite common on airliners. Turnaround times of large aircraft are often impacted by the required cooling time. This is because during take-off the brakes must be cool enough to absorb the heat of a possible rejected take-off. 



Brake temperature and tire pressure indication on the Airbus A330 (note the deflated tire &amp; high temperatures)
Source: Karlene Petitt blogspot