SPARTAN IS RECALLING 484 MODEL YEARS 2008-2010 ADV, BEY, FUR, GLC, GLD, K2, K3, MG, MM, MTR, AND NVS FIRE TRUCK, AMBULANCE, AND MOTOR HOME CHASSIS MANUFACTURED BETWEEN JULY 1 AND 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.