I never heard of it, but according to this eBayer:
Link: http://cgi.ebay.com/ebaymotors/Buic...9589082?pt=US_Cars_Trucks&hash=item3377950d5a
I had the brake accumulator and switch replaced, but ignored the ECM recall(EPA mandated a recall because the emssions were exceded, GM was to put a de-tuned chip in place of factory one)
Link: http://cgi.ebay.com/ebaymotors/Buic...9589082?pt=US_Cars_Trucks&hash=item3377950d5a