CEHobson

So I disassembled it (see below) and for sure part 41 is missing. I have to believe it wore out/broke and the parts fell off. I'm going to disassemble the TRAC piston assembly, and likely will have to find/make some kind of bushing to replace part 41. Apparently it is not available for sale. New noise, old bike for me. I've owned it since 2001, loved it ever since I saw one on the NJ Turnpike in 1986. Thanks again all!

Ah, the picture clears! Thanks very much - for sure the issue is that the pivoting carriage is pivoting freely back and forth and knocking against the pin that activates the TRAC system. I assume that usually the pin extends out from the fork so that the carriage is up against the pin at all times. Appreciate it!

The left front floating caliper, which is mounted so it slides on the carriage, is loose on the carriage so that it clunks back and forth when I'm riding and not activating the brake. The caliper bounces back and forth on the carriage (in the direction it floats, minimal to no looseness perpendicular to the disc) and there is a circular rubber bumper or washer that doesn't seem to be doing anything to stop the clunk. The pistons themselves are working fine, bike brakes fine, everything else seems in shape. 1986 with 27K miles, daily rider, well maintained. Is this something I should address on my own (I don't have any specialized tools beyond socket sets, Allen wrenches and a torque wrench)? Or does it need my bike mechanic? Just trying to figure out the problem. Thanks!

Thanks all. Just ordered the BT45s from BikeBandit.

Any thoughts on best tires to purchase online? My mechanic doesn't have much that he can offer me, and says he's happy to install tires I buy online. I live in Florida. Thanks!