I've done that clutch pedal spring modification. I found out about it when I had an All-Data subscription for the '98 model year S70, before All-Data had anything for my '99 vehicle. The TSB is not listed in the '99 model's All-Data database.

When I went to my local dealer with that TSB, they told me that they couldn't find it in the VADIS system. After I told them that it's listed for the '98 S70 and they found the TSB, I was able to convince them to perform this modification to my 99 model. (They had to call Volvo NA to get permission.) Even after I *gave them* the Volvo part number that was listed in the TSB, they managed to order the wrong part. When I showed up for the warranty service, they lied to me and said that the spring wouldn't fit my car. When we realized that they ordered the wrong part number, I asked them to order the correct one and perform the modification under warranty as they had initially agreed to. They said they couldn't cover it under warranty, but that I could pay to have the service done. Have I ever mentioned how much I hate Red Bank (NJ) Volvo's service department???

Regardless, the new spring looks like a little baby progressive suspension spring, not having the equally wound coils of the original spring. The cost was cheap, under $10 as I recall, and installation took less than 15 minutes.

The resulting pedal feel was "different," but not necessarily an improvement. It certainly had no effect on the disc-engagement problem that started this whole thread.

Bottom line: don't bother.


--
James Rothe, '99 S70 T5M,
http://www.jimrothe.com/volvo/index.html