This bulletin applies to 2011-2015 Buick Allure, LaCrosse and Regal vehicles equipped with the performance strut assemblies. Some customers may comment on a click, pop or clunk noise from the front suspension while braking or driving over bumps at low speed when turning.
This may be caused by a loss of clamp load at the lower revolute joint (kingpin bushing) at the knuckle attachment. Remove the front suspension lower control arm and inspect the torque on the kingpin bushing nuts. If torque is not at least 45 ft-lb, replace the king pin bushings and nuts for both strut assemblies.
When installing the new bushing nuts, torque the nuts once, then remove the nuts and apply liquid thread locker P/N 8902 1297 to the kingpin bushing studs. Re-torque the new nuts to 74 ft-lb.
