NHTSA recall 81V095000
Service brakes, hydraulic › Foundation components › Differential proportional valve
Buick Skylark and 3 more
The defect
Under certain conditions, the rear brakes could lock up without prior warning during high deceleration braking. The problem may be caused by defective proportioner valves in the braking system.
The remedy
The dealer will inspect the brake system proportioner valves and if necessary install new valves.