Quote:
Originally Posted by absentmathis
Sounds like parking brake isn’t actually braking correctly. Usually that triggers a light, but maybe there’s a faulty part that doesn’t. The auto hold uses the hydraulic actuator but the parking brake should hold without rolling after engaged. At least mine does, either by engaging it manually or shutting off with auto hold on. The car doesn’t roll at all.
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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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~Scott
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