Here's the breakdown of what's happening and what you need to check:
* Parking Brake Adjustment: The adjusting screw only controls the parking brake's engagement. It pulls the brake shoes/pads tighter against the drums/rotors to hold the car. If it's maxed out, it means the parking brake cables are already pulling as hard as they can.
* Service Brake Adjustment (Likely the Real Issue): New rear brakes often require adjustment of the *service brake mechanism*. This is the system that's used for normal stopping. The parking brake lever's adjustment only addresses parking brake effectiveness, *not* regular braking. If the service brakes aren't adjusted correctly, the parking brake might feel tight even if the service brakes are applying poorly.
What you need to do:
1. Check your vehicle's manual: It will specify how to adjust the rear service brakes. This usually involves adjusting the brake shoes or calipers to ensure they properly engage the drums or rotors when the brake pedal is pressed. Ignoring this step could lead to reduced braking performance, even dangerous situations.
2. Inspect the brake system: Look for anything unusual – leaks, worn components, or binding. If you find anything wrong, you'll need professional help.
3. If the manual does not detail service brake adjustments: Consult a qualified mechanic. Improper brake adjustments can be dangerous. They have the tools and expertise to correctly adjust your brakes.
In short, the parking brake adjuster's limitation isn't the primary concern. The focus should be on the proper adjustment of the *service* brakes, as this is critical for safe driving. Don't attempt to force anything; brake adjustments are often precise and require specific procedures.
