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Moving the master cylinders, pistons and pads takes a lot of force. Road cars have a vacuum system that reduces the pressure required. When the engine isn't running that vacuum isn't being created and will run out after a period of time the engine is off.
Your 135 is not unique, every roadcar has the same setup.
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Current: 135i Auto, Le Mans Blue - w/ Bridgestone RE-11 rears, GP Thunder 7500k angels, & "golf tee" mod plus a few M3 suspension bits and pieces...
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