NHTSA recall 99E046000 · Equipment
Parking brake
The defect
Equipment description: manifold dash valves (mdv) used in tractor and trailer parking brakes. these valves do not meet the requirements of fmvss no. 121, "air brake systems." a loss of the isolation of the two brake system circuits can result in the loss of service brakes when there IS another failure of one of the two brake circuits.
The risk
The loss of service brakes can occur, increasing the risk of a crash.
The remedy
A replacement valve will be provided to owners with installation instructions.