Technical Service Bulletin IB19X003 — 2018 ISUZU FTR

"SOME CUSTOMERS MAY COMPLAIN ABOUT THE INSTRUMENT PANEL CLUSTER (IPC) AIR PRESSURE GAUGES FREQUENTLY DROPPING INTO THE RED (LOW PRESSURE) ZONE ACCOMPANIED BY AN AUDIBLE ""BUZZER"" WHEN APPLYING THE AIR BRAKES OFTEN, SUCH AS IN STOP AND GO TRAFFIC. WE HAVE DETERMINED THAT THE BRAKE AIR PRESSURE GAUGE RED ZONE BEGINS TO INDICATE LOW AIR PRESSURE UNNECESSARILY EARLY AT 88PSI (612KPA) AS THIS PRESSURE IS SUFFICIENT FOR THE AIR BRAKES TO OPERATE PROPERLY. SIMILARLY, THE BUZZER WILL ALSO SOUND PREMATURELY AT 78PSI (539KPA) AS THAT PRESSURE ALSO IS SUFFICIENT FOR THE AIR BRAKES TO OPERATE PROPERLY. FOR CUSTOMERS WHO EXPERIENCE THIS FREQUENT BUZZER ACTIVATION, ISUZU HAS RELEASED AN UPDATED PIC WITH REVISED (IMPROVED) RED ZONE SCALING AND BUZZER ACTIVATION. THE RED ZONE IN THE UPDATED IPC WILL BEGIN AT 73PSI (501KPA) AND THE BUZZER WILL ACTIVATE AT 66PSI (462KPA). THESE NEW PRESSURE POINTS CONTINUE TO PROVIDE APPROPRIATE AND ADEQUATE WARNING IN CASE OF LOW BRAKE AIR PRESSURE WHILE REDUCING THE UNNECESSARY AUDIBLE WARNING FOR VEHICLES WITH FREQUENT BRAKE APPLICATION, SUCH AS STOP AND GO TRAFFIC. BEFORE REPLACING THE IPC FOR THIS CUSTOMER COMPLAINT, BE SURE TO INSPECT THE AIR BRAKE SYSTEM FOR LEAKS TO ENSURE THERE IS NOT ANOTHER CAUSE FOR THIS COMPLAINT."