i once had a rst which i fitted a rear disc conversion.I never fitted a bias valve and after sometime fitted to the car i founf the rear overtaking the front in a very scary mannor.They were removed from the car and sat in the garage.Im soon to have a high power cabriolet on the road and was thinking of fitting the rear disc kit to it. whats involved in fitting a bias valve,which do you recommend and how do i go around setting the rear brakes up when the conversion ids fitted???