I am using 2001 Avid mechanical disc brake, it's new.
When I want to stop on the road, I start to squeeze the brake lightly so that I can stop smoothly over a long distance, but the rear disc brake produced a vibration. At first it was small, than became pretty big, and all happen( vibration from small to big) within 5 to 7 seconds. This started only today, what can be the problem?
I would have to say your problem is that under heat your disc is distorting. I would think that if you have a dial indicator that if you checked it cold it would be in spec. However, after it heats up from hard stopping it distorts.
Is it still under warranty? If not maybe it can be machined.
Good Luck and Happy Riding!
I would also check the bolts holding the rotors on. Everyone of mine have come loose when new. After I tightened them once, they have never come loose again. Since yours is new I would definately check them.
If everything seems under control, you're just not going fast enough...
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