DAIMLER TRUCKS IS RECALLING 1,460 MODEL YEAR 2009 AND 2010 HEAVY DUTY TRUCKS AND FCCC CHASSIS (USED ON THOMAS BUILT SCHOOL BUSES) MANUFACTURED FROM JUNE 11 THROUGH DECEMBER 16, 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.