Quote:
Originally Posted by Best4x4xFAR
That is how I would have expected it to work. Which leads me to believe mine is not working at all, and that the car does use the hydraulic brakes as a parking brake when the engine is running, since there is no movement after engaging the parking brake, UNTIL I turn off the engine.. 
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My parking brake module failed a couple years ago and I read and learned a bit on the differences between two systems then. I ended up pulling my parking module and sending it to be rebuilt (with new cables) which solved my problem, but I never actually studied how it brakes the rear wheels. I think(?) broken cables will throw a light/code, if not that may be your issue, but otherwise I’d guess parking shoes