Uneven brake pad wear can occur for a variety of reasons, and it's important to address the underlying cause to ensure the safety and efficiency of your vehicle's braking system. Here are some common reasons why one brake pad might be more worn than the others: 

Caliper Issues: A sticking or malfunctioning brake caliper can cause uneven pressure on the brake pads. If one caliper is not releasing properly, it can keep the brake pad in contact with the rotor even when the brakes are not applied, leading to accelerated wear. 

Brake Hose or Line Problems: A kinked or clogged brake hose or line can restrict the flow of brake fluid to the caliper, causing one brake pad to remain engaged against the rotor. This can lead to uneven wear and decreased braking performance on that side. 

Brake Fluid Contamination: Contaminated brake fluid can affect the proper functioning of the calipers and pistons, leading to uneven braking pressure and pad wear. 

Uneven Weight Distribution: If your vehicle's weight distribution is uneven due to factors like cargo or passengers, it can lead to increased load on one side of the vehicle, causing more wear on the corresponding brake pads. 

Driving Habits: Aggressive driving, such as frequent hard braking or riding the brakes, can cause uneven wear on the brake pads, with the ones on the side that's used more often wearing out faster. 

Road Conditions: Frequent driving on hilly terrain, winding roads, or areas with more stops and starts can result in uneven brake pad wear. 

Brake System Components: Components like brake rotors, caliper sliders, and hardware play a role in brake pad wear. If these components are not functioning correctly, they can lead to uneven wear. 

Lack of Maintenance: Neglecting regular brake maintenance can lead to issues that contribute to uneven brake pad wear. This includes not replacing brake fluid on schedule, ignoring brake system inspections, or not replacing brake pads as needed. 

It's crucial to address any uneven brake pad wear promptly to ensure your vehicle's braking system operates safely and effectively. If you notice uneven wear on your brake pads, it's recommended to have your vehicle inspected by a qualified mechanic. They can diagnose the issue, recommend necessary repairs, and restore your braking system to optimal condition. Remember that proper brake maintenance is essential for your safety and the safety of others on the road.