Symptoms of Worn Brake Pads
If you notice any of these symptoms, get your brake pads replaced by a brake mechanic ASAP.
You hear squealing noises
Most, but not all, brake pads are manufactured with built-in “wear indicators.” The sole purpose behind these things is to emit an unpleasant screech. Wear indicators are metal tabs located near the top of typical brake pads. When the brake pad itself wears down to a dangerous extent, the indicator will scrape against the rotor. This creates a distinctive squealing noise that warns you that your current brake pads are in danger of eroding away altogether.
You hear a clicking noise
In some cars, the brake pads fit snugly into a special holding device. Other vehicles keep them steady with clips, bolts, or pins. The common goal behind these designs is to keep the brake pads from moving around. If they become loose they’ll begin to rattle around. This then results in a clicking sound whenever you press or release the brake pedal.
Your car takes more time to stop than usual
This delay in stopping is most often caused by low brake pads. As your brake pads wear down they become thinner and thinner, this means your car has to work harder to dissipate the heat from braking. Over time this decreases braking force. Not only do worn brake pads make it harder to stop, but your reaction time to stop the car is greatly hindered as well. When you press on the pedal you’re actually pushing hydraulic fluid down to the calipers, this then squeezes the brake pads against the rotors. When your brake pads are thin it takes longer for this fluid to travel down and press against the pads. You’ll notice a huge difference when you replace your brake pads from a worn 3-4 millimeters to new pads that are over 10 millimeters.
Your brake pedal vibrates when it’s pressed
As you know friction creates heat, and your rotors and brake pads work together to dissipate this heat. What can happen over time though, is your brake pads lose their ability to help pull heat away from the rotors. When you drive in stop-and-go traffic or you often do sprint driving, this causes your rotors to heat up too quickly and they will begin to warp. This warping creates high spots on your rotors. When you press on your brakes and have warped rotors, instead of the brake pads clamping to smooth-surfaced rotors they are clamping to bumpy rotors. This then sends vibrations through your brake pedal and car.
Your brake light turns on
Your brake light is there for a reason, and it’s important to get your brakes checked before driving much further.
Check brake pads by removing the wheel
If you can’t see the brake pad through the wheel, you’ll need to remove the wheel to get a better look. With your vehicle on a level surface, place your jack under the vehicle frame next to the tire you want to remove. Elevate your vehicle about 6″ off the ground, unscrew the lug nuts and remove your tire. Once the tire is off, you’ll have a good view of not only the brake pad, but also of the caliper, rotor, and brake lines. Carefully inspect the brake pad, looking for excessive wear. If the pad is less than 4 millimeters, or there’s only 20% pad life left it’s time to schedule a brake appointment.
Now that you know how to check your brake pads, check out our guide, so you know what to expect when replacing your brake pads.