THESE TRAILERS DO NOT COMPLY WITH C.M.V.S.S. 121 - AIR BRAKE SYSTEMS.POLYETHYLENE TUBING INSTALLED IN THE AIR BRAKE SYSTEM DOES NOT MEET THE LABELLING AND STRENGTH REQUIREMENTS OF THE STANDARD.CORRECTION: NONCOMPLIANT TUBING WILL BE REPLACED WITH TUBING WHICH MEETS THE REQUIREMENTS OF THE STANDARD.