CARS.COM — If you're lucky, the squealing or squeaking noise that your brakes make when you first drive your car in the morning, particularly after rain or snow, is just surface rust being scraped off the rotors by the brake pads the first few times you apply the brake pedal. It could also be the result of moisture and dirt that collects on the rotors, including from condensation caused by high humidity. If the brake squeal goes away after a few brake applications, no worries.
If the noise persists most times or every time you apply the brakes, or you hear squeals continuously while you're driving, the cause is more serious — and the brake job will be more expensive.
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A continuous high-pitched squeal while you're driving is usually the sound of a built-in wear indicator telling you that it's time for new brake pads. As the pads wear down and gets thinner, a small metal tab contacts the rotor surface like a needle on a vinyl record to warn you it's time for new pads. (Some wear indicators may work differently and engage only when you apply your car's brakes.)
Other squeals and squeaks will require a brake inspection to diagnose and may require cleaning, lubrication or adjustment, and possibly new parts. Most brake noise is caused by worn or loose parts.
For example, an unevenly worn rotor (often referred to as "warped") won't let the brake pads press flat against the rotor when you apply the brakes, and that can create vibrations that generate noise. Likewise, an unevenly worn brake pad won't press tightly against the rotor and may chirp. Another possibility is that the brake pads are loosely mounted, or the shims that hold them in place have corroded or become loose.
Then there are the pads themselves. Some mechanics warn that bargain-bin brake pads are more likely to be noisier than higher-quality, more-expensive pads. In addition, loose or sticking calipers can contribute noise.
Because there are several possibilities causing squeaky brakes — and because brakes are a crucial safety feature — it's best to have a pro inspect and diagnose your vehicle's brake noise.
A grinding sound usually means that the brake pads have worn away, and now the backing plates on which they were mounted are being squeezed against the rotors. This metal-to-metal contact means that you will need to replace the rotors, as well — and that you probably ignored some earlier warning signs of brake wear.
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