Henry Rifle is right about the front/rear brake lines if you have a Corvette style m/c. If you have a Ford m/c, you have them right. You can tell by looking for the reservoir with the larger capacity. The Corvette m/c is tricky to see, because the cap is symmetrical, but look for the bulge in the sides of the casting. The larger reservoir goes to the front brakes. This is because the front disc brakes need to draw fluid from the reservoir as the pads wear, and the pistons move to compensate for the wear. Front brakes wear faster than rear brakes, too.