The 1978 Kenworth C500 has 2 NHTSA recall campaigns affecting an estimated 2,900 vehicles. Recall repairs are always free at any authorized dealer. Last updated July 5, 2026.
THE HAND VALVE INSTALLED IN THE VEHICLE MAY HAVE BEEN INCORRECTLY POSITIONED. THIS WOULD ALLOW AIR TO ESCAPE FROM BOTH THE FRONT AND REAR SERVICE SYSTEMS SIMULTANEOUSLY IF THE CONTROL LINE TO THE REAR AXLE RELAY VALVES SHOULD FAIL. PERFORMANCE OF FRONT AND REAR SERVICE BRAKES DURING FAILURE COULD BE DEGRADED.
THE HAND VALVE WILL BE REPOSITIONED BY THE DEALER, IF NECESSARY, AT NO CHARGE OWNER.
SOME OF THE INVOLVED VEHICLES DO NOT COMPLY WITH FEDERAL MOTOR VEHICLE SAFETY STANDARD NO. 121, "AIR BRAKE SYSTEMS". THE AIR RESERVOIR CAPACITY IS BELOW THAT ALLOWED BY THE STANDARD.
DEALER WILL EITHER REPLACE THE EXISTING TANK WITH A LARGER TANK OR ADD A SECOND TANK, WITHOUT CHARGE TO OWNER.
Recall, complaint, and investigation records from official NHTSA datasets (FLAT_RCL, FLAT_CMPL, FLAT_INV), synced weekly. Counts reflect NHTSA records for the 1978 Kenworth C500 as of July 5, 2026. Complaint narratives are consumer-submitted and unverified. This page contains ads and affiliate links. Full methodology.