master cylinder

Hi all I am currently finishing off my Clio 197 to compete in rallies in The Netherlands. However I have a problem with the brakes. When braking my rear brakes lock up very easily, like I don't even have to brake hard for it to happen. There is already a rear brake bias installed, but when...

Would value your experienced opinions on this. My 2012 200 is going in for its four year service. As much as it pains me, I will use Renault as it's still covered by the 4+ service package it came with, therefore the service is free. I'm aware the schedule calls for the coolant and brake fluid...