OK. I recently purchased the entire brake system off of a 90' 735 for my 86 535i. I bought the rotors calipers master cyclinder etc, however i may be in need of a new booster. Do i need to purchase an E34 booster or can do i need to use one for an E28 still? Does anyone have any idea what to do i need to get the car out on the road ASAP. Thanks in advance.