The parking brake mechanism is internal to the rear drum brakes. Adjustment is done by the brake system itself, and it self-adjusts as you use the brakes regularly. If your emergency brake isn't working correctly, it's almost certainly due to one of these reasons:
* Worn brake shoes: The brake shoes in the rear drums are worn out and need replacement.
* Low brake fluid: Low brake fluid level can affect the effectiveness of the emergency brake.
* Internal cable or mechanism failure: A cable or part of the internal mechanism within the rear drum brakes may be broken or seized.
* Improper adjustment within the caliper: (Less likely, but possible) There might be an issue inside the rear brake caliper itself affecting the parking brake function.
What you should do instead of trying to adjust it:
1. Check the brake fluid level: Ensure it's within the "min" and "max" lines in the master cylinder reservoir. Low fluid indicates a leak somewhere in the system which needs professional attention.
2. Have a mechanic inspect the system: A qualified mechanic should diagnose the problem. They have the tools and expertise to determine if the brake shoes are worn, if there's a cable issue, or if there's something more serious requiring repair. Attempting to adjust something you can't access without the proper tools could damage the braking system further. This is especially crucial given it's your emergency brake.
In short: Don't try to adjust the 1998 Jetta GLX's emergency brake yourself. It's a complex system best left to a professional. A faulty emergency brake is a serious safety concern.
