SUMMARY: RECENT ROCKWELL DEFECT REPORT IDENTIFIED THE FOLLOWING ADDITIONAL CONCERNS:A. INSUFFICIENT AIR PRESSURE DUE TO INADEQUATE AIR COMPRESSOR CAPACITY;B. AIR HORN PLUMBED INTO AIR SYSTEM WITHOUT PRESSURE PROTECTION VALVE;C. BRAKE IMBALANCE CAUSED BY BRAKE PROPORTIONING VALVES WHICH REDUCE THE FRONT BRAKE PRESSURES. THE PROBLEMS IDENTIFIED ABOVE MAY RESULT IN HEAT CHECKING AND CRACKING OF THE REAR BRAKE DRUMS.