Due to an issue in manufacturing, the air brake system in the Cheetah 2006 Container Chassis and Remac Container chassis could fail, causing the air brakes to engage suddenly. Apparently some of the pipe fittings were drilled too deep during the manufacturing process. A thin wall in the male pipe thread resulted, leading to the possibility that the male pipe thread could break off during or after assembly. If the parts fail during use, the air brake system depressurizes. For more on how the air brake system works in tractor trailers see the link on my site to Tractor Trailer Brake Systems.