Inversion Valve Failure/FMVSS 121

Haldex Commercial Vehicle Systems (Haldex) is recalling certain inversion valves. Please see the attached 573 Defect report for full list of part numbers. An internal piston in the inversion valve may fail, delaying the engagement of the parking brake. As such, these valves fail to comply with the requirements of Federal Motor Vehicle Safety Standard number 121, "Air Brake Systems."