Hey guys, Just looking for some advice. I have a Cannonade F29 running Magura Mt2 brakes. Experiencing bad vibration and shudder when pulling the rear brake on descents. Vibration is enough that I feel it through the frame and up through the saddle. I've had them serviced, re-bled and had the disc checked. Have sanded down and cleaned up the brake pads and used alcohol to clean the disc. These solutions work for the first couple of minutes on a ride, then its back to the shudder. I have reduced power and hence not much confidence in coming to a stop. Is there anything else I should try, otherwise thinking of replacing them with some SLX's or something similar. Any help would be appreciated, Thanks!