My 07 Auto Renault Grand Espace Dynamic is displaying a Brake Fault to the Handbrake. The message remains constant, although the car drives all as normal. Can Brake and return into park position, but warning remains. I have had diagnostics from a local garage and their advice is that a Replacement unit is required at a cost of £1100 + and Labour of around £300 !!! Do you think this is a correct Diagnosis ?