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I can back up both my cars under power with the parking brake on, but I can't get either to move forward under power with it on.
Very much too bad. Assuming he did set the emergency brake, maybe he needs to follow the procedure Ross suggests when adjusting his brakes. I think the one on Amelia island was an earlier model. Either it rolled off a trailer or was parked on an incline but it did find a lake.
As to being able to move with emergency brake on in reverse, that describes perfectly the joys of the self energizing Bendix brake system. One of the selling points Packard mentioned is forward rotation causes the primary shoe to rotate slightly pushing the secondary hard against the anchor and causing it to wedge against the drum more tightly thus increasing braking force. You would think it would work in the opposite direction with the primary shoe against the anchor and wedging the drum but I can assure you it does not.
Let me just say you have not had excitement in your life until you are riding in a car with a BTV and engine stalls while you are out for a leisurely drive going up a mountain road. A friend was driving and when the engine quit and car started rolling back he was pushing with all his might -- literally standing on the pedal and he was not a small man. The car barely slowed down as it rolled backwards. If there had not been a mountain on one side he could steer into I have no doubts we would have quickly seen the bottom of a canyon up close.
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