If you don't have any experience with the stock rear brakes, read up on them. The pistons have a narrow range where they work. If you drive the car much you should be constantly adjusting the rear pistons.
Otherwise they run out of travel and don't work!
IIRC, the adjusting is done by using the parking brake regularly. Just get in the habit of always applying it when parking and you should have it covered.
Thanks for the reminder, I've had them on a track car, the builder left off the park brake mechanism, totally forgot how the oem expected them to work!
So you push them all the way in when installing new pads then adjust the piston out to get the amount of drag you want.
