One problem related to brake master cylinder has been reported for the 1997 Chevrolet K1500. The most recently reported issues are listed below.
The master cylinders on 1997 Chevrolet pickups leak brake fluid continuously at the top seal. The dealership called this "sweating". Sweating is what humans do. Master cylinders leak. Every 1997 chevy truck I've looked at has this problem. Gm needs to issue a recall notice to replace the defective seal or replace the entire master cylinder. How many people must die from brake failure before gm issues a recall notice?.