In the US car manufacturers are required to provide recalls for 10 years from the end of the model year. Chrysler just went through a fight with the NHTSA over the gas tank on one of the Jeep models from 1997 to 2005.It appears that there is a vacuum solenoid just to the left of the liquid reservior for the master cylinder on the brake booster.
I have no confirmed details, but if that's the issue it appears like it will be a fast inexpensive fix. Given it's a safety system I believe GM is responsible well beyond the 3 year 36,000 warranty so it will be free at the dealership.
I have an open recall for the splash shield, and I really like how clean the original splash shield keeps the engine clean in a salty winter.. Well that's another issue..