In addition to notifying NHTSA (or Transport Canada) in a situation like this, please notify General Motors.
Call 1-800-222-1020, or write:
Chevrolet Motor Division
Chevrolet Customer Assistance Center
P.O. Box 33170
Detroit, MI 48232-5170
In Canada, call 1-800-263-3777 (English) or
1-800-263-7854 (French), or write:
General Motors of Canada Limited
Customer Communication Centre, CA1-163-005
1908 Colonel Sam Drive
Oshawa, Ontario L1H 8P7
Chevrolet Cobalt Service & Repair Manual. Wheel Hub & Bearing, Replace
Rear
Disc Brakes
1.
Raise and support vehicle, then the
tire and wheel assembly.
2.
Without disconnecting the hydraulic
brake flex hose, remove and support rear brake caliper and bracket
as an assembly.
...