Item Affected: SERVICE BRAKES, HYDRAULIC:POWER ASSIST:HYDRAULIC:HOSES, LINES/PIPING, AND FITTINGS
Date Announced: 12/11/1989
Description of Recall: THE THROTTLE VALVE INSIDE THE HYDRAULIC BRAKE BOOSTER MAY DEFORM FROM BUILDUP OF HEAT AND PRESSURE AND CLOSE-OFF FLUID RETURN PORTS.
Conequence: 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.
Action Need To Fix It: REPLACE BRAKE BOOSTER ASSEMBLY.
Notes: SYSTEM: HYDRAULIC BRAKE BOOSTER.VEHICLE DESCRIPTION: TRUCK.