Disc, drum, and air are all types of what?
Drum brake brakes gradually replaced drum brakes on the front wheels of cars. Now practically all cars use disc brakes on the front wheels, and many use disc brakes on all four wheels. In the United States, the Jeep CJ-5 (manufactured by AM General) was the final automobile (produced for the United States Postal Service) to use front drum brakes when it was phased out in 1984. However, drum brakes are still often used for handbrakes, as it has proven very difficult to design a disc brake suitable for holding a parked car. Moreover, it is very easy to fit a drum
Drum and bugle corps (classic) drum and bugle corps of civilians and veterans, and the corps performed in community events and local celebrations. Over time, rivalries between corps emerged and the competitive drum and bugle corps circuit evolved. The term "classic" is used for the purposes of this article to differentiate it from modern drum and bugle corps, using the time period of the establishment of Drum Corps International as a dividing point in the timeline of the two types of drum and bugle corps. Modern drum and bugle corps are a continuation of the classic variety, for all intents and purposes, having the same