There is another worrying possibilty you must check, often with braided brake lines, the pressure is applied to the pads no matter what the wear level is on these: so when your brake pads have completely worn their actual compund i.e. they are on their last leg, you will get to the end of the metal part and a harsh breaking action takes place. That is because of metal to metal friction. Inspect the pads ASAP before you couls score and knacker the disc for good = -��� you're in the red!