1. Cable System: A central cable runs from the emergency brake lever (located in the center console) to the rear brakes. When you pull up the lever, this cable is tightened.
2. Rear Brake Actuation: The tightening of the cable applies pressure to either a lever or a small drum mechanism located within the rear braking system. Precisely *how* this is done depends slightly on whether your 2003 Grand Cherokee has rear disc brakes or drum brakes. Most likely it has rear disc brakes which usually use a caliper that has a small mechanical actuator engaged by the cable.
3. Brake Application: This pressure physically squeezes the brake pads against the rotors (disc brakes) or the brake shoes against the drum (drum brakes), preventing the vehicle from rolling.
4. Release: Releasing the emergency brake lever releases the tension on the cable, allowing the brakes to disengage.
Important Considerations for a 2003 Jeep Grand Cherokee:
* Regular Inspection: Like any mechanical system, the emergency brake cables, levers, and the components they interact with on the rear brakes can wear out, rust, or become misadjusted over time. Regular inspection is recommended to ensure proper function. A poorly maintained system is a serious safety hazard.
* Adjustment: If the emergency brake doesn't hold effectively, it may need adjustment. This is often a job best left to a mechanic, as it can be tricky.
* Don't rely on it for hard stops: The emergency brake is designed to *hold* the vehicle in place, not to bring it to a sudden stop from high speed. Using it in this manner could damage the brake system.
In short, it's a relatively simple mechanical system, but its effectiveness relies on its proper maintenance and adjustment. If you have any doubts about its functionality, it's best to have a professional mechanic inspect and service it.
