When I was stationed in Illinois I bought a new 78 Jeep CJ-5 for winter time use. Coming from California where it never froze where I lived, I did not know you were not supposed to use the emergency brake when the weather was freezing. One morning after a good freeze I was not able to get the Jeep going. The brakes had froze solid with all the moisture that was in the brake drums after I stopped for the day. Popping the clutch a few times did release the brakes, but it was not good for them. I learned to never use the emergency brakes in the winter just block/chock your wheels.