One problem related to power assist hydraulic brake has been reported for the 2003 Chevrolet Silverado. The most recently reported issues are listed below.
1st event in December 03 atempt to pull out of parking space steering wheel wouldnot turn with foot on brake , serval events since with brake applied steering wheel will not move. Dealer tech. Saw event ,called gm techinal service they gave no remedy to fix problem ,truck is at dealers now.