I an not an expert but I think there may be some wrong info in the above posts. I am sure that for a disc setup you will need a 2 pound residual not 10. Some master cylinders have built in residual valves, others do not. Gently insert a small dowel or tooth pick into the ports. If it goes in about 1/2" then the master clyinder does not have a built in residual valve. If the dowel goes in just a little then it does have the valve. Also, when the master cylinder sets low like yours, residual valves are recomended because your brake lines run higher than the master cylinder. I see no use in changing the size of your brake lines for the same type of set up. Do make sure they don't have crud in them. Good luck.
