Two problems related to brake master cylinder have been reported for the 2002 Chevrolet K1500. The most recently reported issues are listed below.
Sudden total brake failure (all 4 wheels) due to rusted under body brake lines. Service center is replacing all old lines from master cylinder to abs module and onto wheel cylinders. Samples of old rusted lines are being retained.
Spongy brakes, no brakes at times. Last incident Feb. 1, 2006 while backing in drive. Pushed on brake and pedal went to floor. A loud rattling, hammering noise came from vehicle and no braking felt. I have complained about this since I bought the truck in 2003 at 22586 miles. The master cylinder was rebuilt about April 23, 2004 and it didn't help; in fact we about lost all braking going home from dealer. I phoned the dealer and he ordered a new master cylinder. It was replaced may 3, 2004 but the pedal was still spongy and braking very poor. When stopped and engine running you can push the brake pedal clear to the floor. I have been told this is normal. Well, normal almost caused a wreck on a down hill t road with my wife with me. I phoned Chevrolet customer assistance center (file 1-212176923) for help. A waste of time. I phoned Chevrolet motor division (1800-222-1020) and all they suggested was to take the truck back to the dealer, a 30 mile drive one way. They didn't help in four other visits . I did take it back on Jan. 6, 2006 for a brake recall on wheel detectors but it didn't help the braking a bit. Thanks.