When brakes get hot, they can stick for a variety of reasons. The most common reason is that the brake pads or shoes are glazed. This happens when the brakes get too hot and the friction material on the pads or shoes starts to break down. The result is a hard, shiny surface that doesn't grip as well as it should. Another possible cause is warping of the brake discs or drums. When these components get too hot, they can distort and cause the brakes to bind.