McNeilus Truck & Manufacturing (McNeilus) is recalling certain model year 2005-2014 Bridgemaster V Mixer vehicles manufactured October 1, 2005, to December 31, 2014. The affected vehicles are built with the optional Bridgemaster parking brake system on the trailing liftable axle. This parking brake system includes a valve that allows the secondary brake pressure to fall below the required 45 psi after one treadle application. As such, these vehicles fail to comply with Federal Motor Vehicle Safety Standard (FMVSS) No. 121, “Air Brake Systems.”