One problem related to brake disc caliper has been reported for the 1999 GMC C1500. The most recently reported issues are listed below.
Excessive rust build up on brake rotors and calipers. Rotors & pads previously replaced in Mar. , 2007 after driving 40,000 miles. Needed replacement again in oct. , 2009 after only driving 14,000 additional miles. Instrument cluster failed and was replaced in June, 2011 at 58,000 miles. Dealer advised no recall on this model, although identical instrument clusters for newer vehicles had been recalled and were being replaced at no charge.