GREAT DANE TRAILERS IS RECALLING 43 MODEL YEAR 2009 SEMI-TRAILER CONVERTER DOLLIES, MODEL DLY-0022-00099, MANUFACTURED FOR FEDEX GROUND BETWEEN JULY 16 AND AUGUST 13, 2008, EQUIPPED WITH CERTAIN HALDEX QUICK RELEASE VALVES (QRV). THE RUBBER DIAPHRAGM INSIDE THE QRV MAY EXPERIENCE DELAMINATION RESULTING IN SIGNIFICANT LEVELS OF AIR PRESSURE LEAKAGE PAST AND/OR THROUGH THE DIAPHRAGM, OR THE DEVELOPMENT OF A BUBBLE IN THE DIAPHRAGM WHICH MAY TRAP AIR PRESSURE IN THE VALVE AND NOT ALLOW THE SERVICE BRAKES TO RELEASE.