Here's what's involved:
* It's not a DIY job for most people. This is more complex than adjusting a simple cable. If you're not comfortable working on brakes, take it to a professional mechanic. Improper adjustment can lead to poor braking performance and safety hazards.
* Diagnosing the problem: Before attempting any adjustment, determine *why* your parking brake isn't working correctly. Is it:
* Not holding the vehicle? This could be due to worn brake shoes, weak return springs, or a problem with the cable (though less likely with this integrated system).
* Dragging? This usually indicates the parking brake shoes are adjusted too tight.
* Possible solutions (requiring mechanical expertise):
* Replacing the parking brake shoes: This is often the most common fix. The shoes wear down over time, reducing their effectiveness. Replacing them requires removing the rear brake rotors and drums.
* Inspecting and replacing return springs: These springs retract the brake shoes when the parking brake is released. Weak or broken springs can prevent the shoes from fully disengaging.
* Rarely, cable issues: While less common in this integrated system, a damaged or frayed parking brake cable could still be an issue.
In summary: Don't try to "adjust" the parking brake on your 2001 GMC Sierra yourself unless you have extensive automotive experience, including brake system knowledge. The most likely cause of a malfunctioning parking brake is worn brake shoes, which require professional-level repair. Take it to a qualified mechanic for diagnosis and repair. They'll have the proper tools and expertise to correctly assess and fix the problem safely.
