Abstract: A control unit affixed to an adjustable stand mounted on a platform on wheels, has an electrical on/off switch which controls the vacuum pump of the extractor unit, a brake fluid and air extractor control valve which controls the flow of air and brake fluid being extracted from the master cylinder and brake system, a brake fluid application control valve which controls the flow of brake fluid (free of air) from the brake fluid reservoir container (with bracket) affixed on top of the control unit, a vacuum meter indicator which indicates the amount of vacuum present, and a master cylinder brake reservoir top with U-bolt which fit securely over the master cylinder of an automobile or truck. The control unit is connected to the master cylinder brake reservoir top by a heavy duty dual function extractor/application hose. The master cylinder brake reservoir top can be modified to fit other motor vehicles.

Abstract: By a combination of a slump indicator calibrated for each of the several particular trucks in a system of concrete mixer transport trucks and a particularly readily locatable dynamically balanced emergency power unit, the contents of the drum or mixer of a disabled concrete mixer truck are mixed and/or tested and/or treated and/or discharged as needed.