One problem related to brake sensor has been reported for the 2001 Chevrolet C1500. The most recently reported issues are listed below.
On a Saturday 11/21/2009 I was driving my 201 Chevrolet silverado {59,021 miles} down a dirt incline which leads to a pond. When I applied the brakes ,there were no brakes at all, and I keep going while my foot was holding the brakes down , until my truck's front tires were in the ponds water. As I entered the water the brakes finally took hold and I stopped. It was a beautiful clear day without any ice or snow. This is the second time it has happened~ the first was about 11/2003 I was having brake problems {the brakes would chatter when applied}so I brought the truck to a Chevrolet dealer to ck. The brakes this was on 12/01/2003. The service department called a few days later and said the mechanic had a accident with the truck, he was bring it into the garage and he had gone right through the closed garage doors because of a brake failure. The dealer at this point called general motors and reported the problem with the brakes {not stopping & going through the closed doors}damage was done and they had to replace the bug deflector,bumper cap , front grill & repaired and painted the hood. They also replaced the ~wheel sensors ~telling us that this was the problem. We had no use of the truck for about 6wk. The truck was returned to us without charge. Were afraid to drive this truck now fearing someone will be injured or killed because we are never sure when this brake failure will happen again. We have called gm they made an appointment with a Chevrolet dealer but they refused to pay for the diagnostic test to confirm the brake failure .