If your parking brake isn't working correctly, the problem usually stems from one or more of these issues:
* Worn brake shoes: This is the most common cause. The shoes are the friction material that engages the rotor. They wear down over time and need replacement. You cannot adjust worn shoes; they need to be replaced.
* Low rear brake fluid: Low fluid level can affect parking brake performance because the parking brake uses the same hydraulic system as the service brakes. Check your rear brake fluid level in the master cylinder reservoir.
* Internal problems within the rear drum/rotor assembly: There might be rust, corrosion, or mechanical damage inside the rotor preventing proper engagement. This requires disassembly and inspection of the rear brakes by a mechanic or DIYer with experience.
* Damaged or stretched parking brake cables (less likely): While less common in this system, it's possible the cables have stretched. Inspect the cables for damage. This would likely be accompanied by other problems with brake performance.
What you should do:
1. Check the rear brake fluid level: This is the easiest first step. If it's low, add fluid of the correct type (consult your owner's manual). If the level is repeatedly low, there might be a leak in the system that needs attention.
2. Check the parking brake operation: How many clicks does it take to fully engage? Does the parking brake hold the truck on a slight incline? If it's engaging too easily or not at all, the problem is likely internal.
3. Inspect the rear brake shoes: This requires removing the rear brake rotors and drums (which is a more involved procedure). If the brake shoes are worn thin or damaged, they must be replaced.
Recommendation: Unless you have significant mechanical experience working on brakes, taking your 1996 K1500 to a qualified mechanic is strongly recommended. Improperly adjusted or repaired brakes are extremely dangerous. Replacing the rear brake shoes is a relatively common service and shouldn't be overly expensive. The mechanic will be able to properly diagnose and fix the issue, ensuring your safety.
