The stock rear calipers seem to need initial hydraulic pressure to the pistons and pads in order for the parking brake to function properly. During a recent project I was assuming that the parking brake would be functional after a complete rebuild of the calipers. I have a sloped driveway and found the parking brake unusable when rolling the car out of the garage. Eventually the hydraulic system was online and it looks like it was able to push the pistons and internal mechanisms into place. Now the parking brake works great.
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