I just did the rear brakes on the rear of my HHR LT and the shoe retainer bar was a pain in the butt to install and the ebrake cable. Is there any company that makes a rear disc brake kit for our HHR's?

 

The axle doesn't have mounts for calipers. Powell raceshop sells a rear disc upgrade that uses heavier duty parts, but a cheaper way is to find a rear axle complete with disc brakes and ebrake cable from a cobalt.

 

Just a quick note, if you decide to do them again... If you loosen up the Ebrake cable. (It's under the Ebrake lever) the brake are super easy. I use a pry bar to install and uninstall the U shaped hold down spring.