Out of adjustment air brakes and brake system defects constitute the major defect areas resulting in commercial vehicles being placed out of service. Poorly adjusted or defective air brakes reduce the braking capacity for large vehicles and further inhibit their stopping distance. Under ideal conditions, the braking capacity of commercial vehicles is twice as far as that for cars and other smaller vehicles. This increases the risk to other users of the road and the driver (or his/her passengers) of the vehicle itself.
