I have avid juicy 4 rsl disc brakes on my bike. I am having a problem with stopping as when i apply the front brake there is a horrible loud squeaking noise as the brake pads bite but then they release even though i am still applying pressure to the brake. I have had the pads out and cleaned them and roughed them back up they still have plenty of life in them, i have done the same with the disc rotor but it is still doing it. I am at a loose end with them