After 32000 Km, I decided it was time to check out the rear brakes. the car was bought new in late Feb 2015.
They only needed a few clicks of adjustment... which has me convinced that all is good ad properly adjusting.
I am entertained by the location of the backing plug. center of the rear shoe web adjacent to the hold down pin. I am guessing that is where GM techs take a heavy drift to the well worn brakes to knock the drum off.
I also use antii-sieze on the hub surfaces of drum and threads of the hub. I use caliper lube on the sliding and threaded components of the actual braking system.
Now for all you folks that actually enjoy doing Preventive Maintenance aside from the stuff above, you might find this interesting or crazy.
On other cars that I have owned with drums and no means of backing off the shoes. Each time that I would go to check my brakes, which is typically each oil change. I would have the car up on stands all around, remove all the wheels, remove the rear drums.
Find my drill and a round stone like the one attached below, and some earplugs!
I would attach one drum to one of the front hubs of the car backwards with lugnuts clamp the other side disk so it would not rotate. an start the car and gently put it in idle first gear.
Run the drill in the opposite direct of the rotating drum and carefully grind down the lip until it was polished down to the same level as the braking surface. For those of you that recall having turned brake rotors and drums this will instantly give you flashbacks from generated noise.
Crazy or interesting. It is what I will be doing for this car too in about 4000 KMs. and every 24000 thereafter.