SBC control unit on 2003 Mercedes-Benz E500

How much will it cost to have this unit replaced. Mine keeps giving me the brake failrue reporti have been advised to replace the unit.

Wh did you need to have this replaced? How much did you end up paying for this?
3 more answers
I was told this was replaced at no charge when needed for the lifetime of the car and possibly will go out around every 100k miles. The dealer service manager advised me of this himself.
It cost to me 1600$ CAD + 2hours label.
I got my SVC pump and Computer replaced under warrenty. MB dealer told be that they will replace this unit until 2013 and unlimited miles....