5 reasons why car brake pads wear unevenly.
Uneven brake pad wear often develops silently, but if not detected early, this hidden problem can lead to costly repairs.
The car's brakes are a crucial part of the steering system. Therefore, if you hear a loud screeching sound while driving, or worse, notice difficulty braking, it's a sign that the braking system is experiencing problems.
When you take your car in for inspection, if the technician informs you that one brake pad is wearing out faster than the other, here are some possible reasons for this.
The brake caliper or slide pin is stuck.
The brake caliper's job is to press the brake pads against the brake disc (rotor) each time you apply the brakes. When a caliper gets stuck, it will continue to press the brake pad against the disc long after you release the brake. If this happens for an extended period, the brake pad in that position will wear out significantly faster.
The same thing happens if the sliding pins are rusty or dry. They need to be lubricated regularly for everything to move smoothly. Otherwise, your brake pads will only work effectively on one side.
Brake pads are improperly mounted or of poor quality.
Improperly installed brake pads (or cheap, ill-fitting brake pads) can cause uneven contact between the pads and the brake discs, resulting in uneven wear. Imagine wearing a shoe where only one sole touches half the ground – over time, one side will wear out faster than the other.
Unbalanced brake pressure
Hydraulic braking systems operate based on uniform pressure distribution to each wheel. When the oil lines, master cylinder, or pressure distributor malfunction, such as blockages, leaks, or insensitivity, the pressure transmitted to the brake pads will be uneven. The side with more pressure will experience stronger braking, causing the brakes to wear out faster, while the other side will operate "loosely," with the discs continuing to rotate even when the vehicle is in P gear.
The brake disc is warped.
It doesn't need to be excessively warped; even a slight protrusion or tiny indentation on the brake disc is enough to cause a difference in thickness and surface flatness. This will then cause a vibration in the brake pedal.
Brake pads must be constantly adjusted to match the uneven surface of the brake disc, resulting in inconsistent wear patterns. Removing, measuring the flatness, and regrinding or replacing the disc is the only way to restore the uniformity of the brake surface.
Suspension or tire problems
Brakes don't work alone; they're a coordinated effort involving brake pads, brake discs, and the road surface, all connected via the tires and suspension system. When tires wear unevenly, the wheel alignment (toe, camber) is incorrect, or suspension components like ball joints or stabilizer bars are loose, the braking force will be distributed improperly.
The result is that one wheel angle bears a greater braking load, causing uneven brake pad wear. If not addressed promptly, you may end up paying more for additional parts and wheel alignment.
Solutions and notes for users
- Regularly clean and lubricate the brake calipers and slide pins to ensure smooth operation and prevent jamming.
- Use high-quality brake pads and discs, install them correctly, and adhere to the manufacturer's recommended clearance.
- Check the flatness of the brake discs every 20,000 - 30,000 km; regrind or replace them if warping is detected.
- Check brake pressure and change brake fluid on schedule, and replace faulty brake cylinders.
- Regularly align and balance tires, and inspect the suspension system to ensure that braking force is always evenly distributed.
Finally, regular car maintenance and servicing not only ensures smooth and stable brake operation, enhancing safety on every journey, but also saves on repair costs. Make sure your brakes are in top condition before every trip.
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