Putting 256mm fronts on my 8v GTI, but the rears are shot and are going to need replacing too. On a bit of a budget, was going to go to GSF, but wanted to know if theres any discs/pads I should avoid. Also, am i going to need to adjust the bias valve (I'm assuming I have one) after putting bigger brakes on. I'm not entirely sure how the bias valve works and what it does, if you hadn't guessed lol