One of the best Hydraulic Disc Brakes for Tandems has been the Hope Mono M4's, Or M6 if you want the ultimate. One of the problems I found, even though I use the 200mm discs, has been the heat generated from the disc's. Never had a problem with efficiency when hot but "Alpine" riding may cause a problem.

Hope have bought out a new Brake and the new form of the M4 looks as though it will be better suited to Tandems. Haven't tried them but well worth a look.


Hope Web site

http://www.hopegb.com/


Review of the brakes is shown below

http://www.hopetech.com/database/MBUK.pdf


And a better look at the brakes is shown below

http://forums.mtbr.com/showthread.php?t=251803