Park Brake System
WARNING: This page does not describe the selected car, but rather 12 other vehicles, including the 2003 GMC Yukon XL, 2003 GMC Yukon, 2003 GMC Sierra, 2003 GMC Cab & Chassis Sierra, and 2003 Chevrolet Tahoe. However, it is still accessible from the selected car via links, so may be relevant.
Review the system operation in order to familiarize yourself with the system functions. See PARK BRAKE SYSTEM under DESCRIPTION & OPERATION.
Inspect for aftermarket devices which could affect the operation of the park brake system. Inspect the easily accessible or visible system components for obvious damage or conditions which could cause the symptom.