In a separate post, I outlined my brake problem and what I have done to fix it, and the responses were "You have warped rotors, replace them." I responded to those posts with this, which I am posting here in case anyone has any ideas about how to proceed:

Let's start over here...rotors, I am told, don't warp without a cause, and that cause is almost always sticking calipers. I replaced warped rotors in April, and within a few weeks or less, the new ones started pulsing, leaving me to suspect that they are getting heated up too much for some reason.

I checked the rotors with a dial indicator, when they were cold, and their runout is less than .002", and Volvo specifies a maximum of .003". I have to measure them hot next, because it is when they heat up that they go out of whack.

Simply replacing warped rotors with new ones without dealing with the cause of the warping is futile. That is what I am trying to figure out now. I replaced the pins and boots of both calipers, greasing them liberally, and hoped that would free the calipers up enough to keep them from sticking. Perhaps it has, but the rotors are still warping when they are hot, after driving for awhile.

So the next line of attack will be replacing the calipers with rebuilt ones (I am told rebuilding them onesself is a waste of time). It may be that I have to replace the rotors as well if they are permanently damaged, and of course, the brake pads, etc.

Honestly, if I knew of a shop I could really trust to take care of this, I would take my car to it, but no one gives the job the kind of attention and scrutiny I do, and I have caught my local Volvo dealer in several misdiagnoses (costly) which show that beyond the basics, doing it yourself often is the only way.


--
Darius in Albany NY '86 744 GLE (175K, given to my mother-in-law); '91 745 Turbo (173K-my 'Little Red Wagon')