OSHKOSH IS RECALLING 302 MY 2008 T-SERIES, TX, STA, H, P, S AND H-TRACTOR, AIRPORT RESCUE, FIREFIGHTING, COMMERCIAL, CONCRETE MIXER AND MILITARY TRUCKS AND HIGHWAY VEHICLES EQUIPPED WITH HALDEX AIR BRAKE SYSTEM CONTROL VALVE. THE RUBBER DIAPHRAGM USED INSIDE THE QUICK RELEASE VALVE (QRV) MAY DELAMINATE AND MAY CAUSE LEAKAGE LEVELS PAST AND/OR THROUGH THE DIAPHRAGM IN EXCESS OF PERMISSIBLE SPECIFICATIONS, OR COULD CAUSE A RESTRICTION IN THE AIR FLOW, THEREBY EFFECTING PRESSURE DELIVERY TO THE SERVICE BRAKES AND NOT ALLOW THE SERVICE BRAKES TO RELEASE.