There is a emergency brake set up that is not part of the rear pads like on most cars. I don t know enough about it because the dealer found the problem and replaced But the pad de laminated it self from the plate on the e brake causing it to rub. I ll bet if it happens once it happens 1000 times.
PS My e430 is for sale. Mint, low miles w warrenty. It will be in Jan/ Feb star mag...

__________________
98 E430(sport), 99 ML 320 (sold) , 05 C 230(sport) Mark