We have had our Santana Team Scandium for about a year now. Shortly after purchasing the bike I upgraded the rear brake to a disc. This included the 250mm winzip roter, Avid caliper, and Santana specific frame adapter. As a long time mountain biker I'm pretty familair with all kinds of disc brakes and the install was pretty straight forward.
Immediately I ran into what has now become and long running issue with this setup. No matter what I do the brake howls pretty much non-stop. The second issue, on any substantial descent the brake overheats and that set of pads will permanantly lose a good portion of thier stopping power.
Going from what I have learned in setting up numerous mountain bike brake systems I first focused on getting the caliper aligned with the rotor. This seemed to help somewhat, but not completely. The brake only makes noise under light pressure, if I grab the brake with a little more power it goes past the point of howling and actually slows the bike down without making too much noise. I could live with this if I had to. The second part of my problem is on a substantial downhill, the brake seems to overheat and then braking power fads quickly and that set of pads is pretty much done as they never seem to perform at an acceptable level again. An example of this would be coming down a 6% grade, using the brakes to slow for a few hairpin turns, and then trying to stop the bike from a speed of 30mph on the same grade. This will be too much for the rear brake and I will experience what I described.
Thinking this may be a problem with the Avid caliper and that is not what Santana specs in they official disc brake upgrade, I went ahead and purchased the Winzip dual action tandem caliper. This produced no change in results for either noise or performance. If fact the Winzip Caliper is seems to be made very cheaply and had a far amount of slop in its motion so if anything the problem was slightly worse.
What are other people experiencing with their Santana's and the 10" rear discs?
I have tried a number of different pads including the EBC Gold's which I saw mentioned in a few other threads. The golds seemed to work maybe a hair better.
Thanks in advance for any advice.