I am not sure on these but if it is an electric h/brake it will need to go onto a suitable computer,this will be needed to either wind back your caliper pistons or diagnose your fault with your control unit.I was speaking to someone about these a couple of weeks ago who has done some of these,the control unit is £1400 and the motor he was on about was the second one he had fitted to that motor,in my opinion a complete waste of money and another reason to never buy a Renault,if it is a manual h/brake then check for seized cables,pad wear,seized calipers.
cdc, September 2013