Re: Disc Brake Blues.
Posted: Wed Apr 13, 2011 10:25 pm
Consider the possibility that an object thrown up from the road was lodged and cause the hot spot.
Excellent idea Ken, and one I'll be trying soon - however aren't there in fact two null positions? Can you recall which one is the favourable one??Ken in Oklahoma wrote:I'm not a fan of the felt tip pen method of aligning the caliper to the brake disk. I've chased my tail way too many times and spent too much time trying to get it right. The calipers will align themselves if you only let them.
The idea is simple, if not simple to communicate. You remove that cap and spring talked about earlier. Now you find a wrench or socket that you can get onto that nut, 13mm IIRC. The idea is to put some brake pressure on the hand lever and then move the nut to find out where the caliper "wants" to be. Where it wants to be is lying flat against the disk, which is of course what you're aiming for using the felt tip pen technique.
If you don't have a helper to hold the front brake lever you can do as I do and use a rubber band cut from a motorcycle inner tube to keep pressure on the lever. Now you can move the nut, watch the caliper move in response, and determine for yourself where the null position is for the caliper. There is a bit of ambiguity at the null position. I'll move the wrench one way until I feel some resistance and, move it the other way, then split the difference.
Ken