2004 Chevrolet Silverado 1500 drivetrain & axles problems

Dt: the vehicle is a 2004 GM chevrolet k1500 z71 extend cab 4x4. Anti lock brakes were defective. When consumer applied pressure to the ABS they did not hold. On 2-11-05 he took vehicle to the dealer to be repaired, and they did nothing to fix the issue. While driving on 6-23/24-05 the ABS did not hold , causing consumer's vehicle to lightly bump another vehicle. When consumer contacted the manufacturer they told him to take it to city chevrolet.

Tl*the contact owns a 2004 chevrolet silverado 1500 z71. The service 4 wheel drive light illuminated when he first purchased the vehicle in august of 2008. The dealer repaired the vehicle per the warranty and replaced a switch underneath the instrument panel; the failure recurred in december 2009. A local mechanic stated that there were codes for the transfer case motor and axle; yet, it was nothing definite. The contact also stated that the ABS light was illuminated.