Here's what's typically involved and why you shouldn't just try to "adjust" it:
* Problem is rarely simple adjustment: If your parking brake isn't holding, the issue is *almost always* one of the following:
* Worn brake shoes: The rear brake shoes are worn down and need replacement.
* Low brake fluid: Low fluid reduces brake effectiveness, including the parking brake. Check your fluid level in the master cylinder reservoir.
* Internal adjuster malfunction: The self-adjusting mechanism within the drum brake may be malfunctioning. This isn't something easily repaired without removing and disassembling the rear drum brakes.
* Cable issues: While less likely, the parking brake cable could be stretched, broken, or rusted, preventing proper engagement.
* Contaminated brake shoes: Oil or grease on the shoes would significantly reduce stopping power.
What you *should* do:
1. Check the brake fluid level: This is the easiest first step. Add fluid if necessary, but if it's consistently low, there's a leak somewhere in the system that needs to be addressed.
2. Inspect the parking brake cable: Check for any visible damage, rust, or looseness.
3. Have a mechanic inspect the rear brakes: This is the most important step. Attempting to disassemble and adjust the rear drum brakes without proper knowledge and tools can be difficult and potentially dangerous. A mechanic can diagnose the problem accurately (worn shoes, adjuster issues, etc.) and perform the necessary repairs or replacements.
In short: There is no easily accessible adjustment mechanism for the parking brake on a 1993 Chevy Beretta. A weak parking brake requires professional diagnosis and likely repair or replacement of components within the rear drum brake system. Attempting DIY repairs without experience can lead to more problems.
