Contents: Wear indicators ⇊ Inspection ⇊
Wear indicators
The front brake pads have a metal loop that contacts the disc when the friction surface is worn down to a minimum. Wear indicators make a constant, distinct metallic sound that is easily audible. The sound can be described as being like fingernails scraping a chalkboard or crickets in a field. A clue that it is a wear indicator and not some other brake noise is that the sound is audible when the vehicle is moving WITHOUT using the brakes. (There may be no sound when braking.)
It should be noted that due to the nature of the design, no disc brake system can ever be quiet. Each system includes various pads, plates, and hangers to suppress brake noise, but it is not possible to completely eliminate all noise. Some brake noise - high or low frequency - can be controlled and possibly reduced, but cannot be completely eliminated.
Inspection
The front brake pads can be inspected without removing them. With the front of the vehicle raised and securely supported, remove the wheel(s). Unlock the steering column lock and turn the wheel until the brake caliper comes out from under the fender.
Inspect the pads - inner and outer - through the window in the center of the caliper. Look at the thickness of the pad friction surface (the part that actually squeezes the disc), which is more important than the thickness of the backing plate, which does not change with wear. Replace the brake pads if the thickness is less than 2.4 mm.
Keep in mind that you are looking at the profile of the pad, not the entire pad. Brake pads can wear to a cone that may not be visible. It is also impossible to check the contact surface for splits or cracks from this position. This quick check is only useful to a limited extent; a detailed inspection requires removal.
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