Airheads equipped with ate disc brakes all have the master cylinder mounted beneath the fuel tank (R75,90/6's R90S's R60,75,80&100/7's made before '81)
(with the exception of '79 R65's which use ate calipers ripped off from a brembo design and use a proper bar-mounted master cylinder).... but I digress....
When bleeding the brakes on ate equipped bikes.... ALWAYS remove the fuel tank and loosen the master cylinder from the band clamp that secures it to the frame.... and tip if forward.... you'll very likely see a few bubbles rise to the surface of the m/c's reservoir..... This is air that would otherwise never leave the system because of the angle the m/c's mounted to the frame.
