Volkswagen is recalling nearly 92,000 cars in the U.S. to fix mechanical problems that can knock out the power-assisted brakes. The recall includes the Beetle, Golf, Jetta and Passat models from 2015 and 2016. The cars have 1.8-liter and 2-liter turbocharged four-cylinder gasoline engines. The German automaker says a part in the camshaft can shear off, causing loss of vacuum in the power brakes. That can lengthen stopping distance and possibly cause a crash. The engines also will go into a reduced power mode to avoid further damage.