NHTSA (USA)Critical
1990 VOLVO WXLMNHTSA Campaign #91V033000
The official notice
Defect
IMPROPER PARK BRAKE CONTROL VALVES MAY HAVE BEEN INSTALLED; THE SUSPECT VEHICLE HAVE DISK BRAKES WITH PARK BRAKE VALVE DESIGNED FOR DRUM BRAKES.
Safety Risk
TRUCKS LEFT WITH PARK BRAKES ENGAGED COULD BEGIN TO ROLLAFTER THE DISK BRAKES COOLED, AND COULD RESULT IN A VEHICLE CRASH WITHOUTWARNING.
Remedy
REPLACE CONTROL VALVE WITH THE CORRECT DISK BRAKE VALVE.
Updated June 10, 2026