The power brake booster in these vehicles uses vacuum developed by the engine to provide power assistance to the braking system. Certain vehicles are being recalled because the shell of the vacuum brake booster can corrode and allow water to get inside. The water inside could freeze and limit ability of the brake booster to provide brake assistance. This reduced braking ability can increase the risk of a crash. Dealers will test the brake booster and replace those that fail, and all vehicles will have a diverter shield installed on the brake booster to prevent this from occurring in the future.
Recalls are issued for cars with safety-related defects or problems