Defect summary
THE THROTTLE VALVE INSIDE THE HYDRAULIC BRAKE BOOSTER MAY DEFORM FROM BUILDUP OF HEAT AND PRESSURE AND CLOSE-OFF FLUID RETURN PORTS.
Consequence
THIS COULD CAUSE EXCESSIVE PRESSURE BUILDUP IN THEBOOSTER CAUSING THE BRAKES TO SELF APPLY WITH A SEVERE UNEXPECTED STOP. THISCONDITION COULD ALSO RESULT IN LOSS OF POWER STEERING ASSIST. EITHER CONDITIONCOULD RESULT IN AN ACCIDENT.
Remedy
REPLACE BRAKE BOOSTER ASSEMBLY.
Notes
SYSTEM: HYDRAULIC BRAKE BOOSTER.VEHICLE DESCRIPTION: TRUCK.
Source: NHTSA ODI recalls file, campaign 89V224000. Text as published by NHTSA.