also depends on teh size of the mater cylinder which is sized initially to move enough fluid to move the 2 std pistons on teh fron andn teh 2 tiny slave cylinder in teh rear hubs - once you increase the amount of fluid needed to apply the brakes by adding bigger brakes with bigger pistons and caliopers (more aparent on the back) you will find that brake pedel travel is greatly increased as yuo have to move more fluid to make the brakes come on - you may need a bigger master cylinder...