The brake pads are friction material that is pressed against the discs. They eventually wear and must be replaced. Depending on how and where you drive, the pads used will determine how long it takes to get there.
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How to check brake pads?
The pads are attached to brake's calipers with an inspection hole at the top that allows you to check the thickness of both the disc and the rotor. You can inspect the outer pads of some aluminum-alloy wheels. However, in most cases, you will need to lift the car and take off the wheels to check the pads on both sides.
Different guidelines are used by mechanics to determine when pads need to be replaced. Depending on the vehicle, new pads can be anywhere from 3/8 to 1/2 inches thick. Some shops suggest replacing pads when they are less than 1/4 inch thick. Others recommend 1/8 inch or when there is only 20-25 percent remaining. If the thickness is too low, it can cause damage to the rotor.
Many mechanics measure pads using
Many mechanics measure pads using a ruler or other tools to measure thickness. You can also check for exact replacement pads that are available to compare.
Pad thickness should not be the sole concern, as brakes are an essential safety feature. The thickness of the rotors as well as the wear on the pads can be measured by a repair shop. Sticking caliper slides, pins or caliper slides can cause uneven pad wear. The calipers may need to be cleaned, lubricated or replaced. If the problem persists, simply replacing the pads won't fix it.