Therefore, there's no external adjustment mechanism for the parking brake itself. If your parking brake isn't working properly, the problem likely lies elsewhere:
* Low Brake Fluid: Check your brake fluid level in the master cylinder reservoir. Low fluid can affect both service and parking brakes.
* Worn Brake Shoes: The rear brake shoes are likely worn. This is the most common cause of a weak parking brake. They will need to be replaced, and this is a job best left to a mechanic unless you have experience with brake work. Replacing the shoes often automatically adjusts the parking brake.
* Cable Damage or Stretching: The parking brake cable could be stretched, frayed, or rusted. A mechanic can inspect and replace it if necessary.
* Internal Problems in the Rear Drums: There could be internal issues within the rear brake drums, such as seized components or damaged mechanisms. This requires a professional diagnosis and repair.
* Parking Brake Lever Adjustment (Slight possibility): While not a true adjustment of the brakes themselves, the lever inside the car *might* have some play or adjustment. This usually won't significantly improve a drastically weak parking brake but could help with a slightly weak one. Check your owner's manual to see if any slight lever adjustment is possible. This is unlikely to solve the problem alone.
In short: If your 1993 Chevy Lumina's parking brake is ineffective, you should take it to a mechanic for diagnosis and repair. Attempting to adjust it yourself will likely be fruitless and could even be dangerous if you're not experienced with brake systems. The issue almost certainly stems from worn components or a mechanical problem requiring professional attention.
