The shields were installed in 2014 in conjunction with a recall involving the same set of vehicles, which cover the model years 2011 through 2014. A review of warranty data led to an FCA U.S. investigation that discovered the problem. FCA says it is aware of one potentially related accident, but no injuries.
The shields are designed to keep water away from the boosters, lest it cause corrosion or freeze in cold temperatures and negatively affect brake performance. Brakes will still function even if boosters are compromised by water, FCA says, but drivers may experience brake-pedal firmness. In some cases, a potential booster issue may trigger a warning light or activation of the anti-lock brakes.
Customers who've observed any of those conditions are urged to contact their dealers. The automaker says it plans to notify affected owners that free service to check and repair the issue if necessary will be available in early November.