http://wheels.blogs.nytimes.com/2011...-fire-hazard/#

About halfway down the page:

"General Motors is recalling almost 4,300 of its new 2012 Chevrolet
Sonics because they might be missing 'the front brake inner or outer pad'.

"In a filing with the safety agency, G.M. said this could 'produce noise
when the brakes are applied, result in reduced brake system performance
and require a longer distance to stop the vehicle.'”