Lexus GS F

Brake Noise: Telltale Signs of Trouble

Wouldn’t it be great if our cars told us when something is wrong? In a way, they already do. Modern cars have instrument panels with dozens of symbols and warning indicators. These notify you of basic issues, like the windshield washer fluid is low, as well as possibly dangerous problems.

Cars make a lot of noise, but there are a few telltale noises that signal your brakes are the culprit, and certain types of brake noise spell trouble. Here’s what the different noises mean.

1. Squealing brakes when brakes are not applied.

When you step on the brakes, you expect to hear some noise as you begin to decelerate. The brake linkage may creak, the brake booster may huff, and the tires may complain a little if you are really stopping hard. What’s disconcerting is when the brakes squeal and your foot is not pressing on the brake pedal. In all likelihood, a brake pad needs replacement.

Most of today’s brake pads come with wear indicators, a small metal protrusion attached to the pad’s backing plate. Before your pads wear out, the indicator comes in contact with the brake rotor or disc, making a squealing noise.

In this case, brake noise serves as a warning to replace the pads now or risk a more costly repair later when the pads are gone and a metal backing plate comes in Put the new rotor on (clean with brake cleaner fluid first!) then fixed bit of the caliper goes on.contact with the brake rotor. Check all four wheels for signs of wear.

2. Squealing brakes when the brake pedal is applied.

What if you hear the squealing noise when you step on the brake pedal and as you come to a stop? As with the first example, your brake pads may be shot and the wear indicator is telling you it is time to replace your pads.

But don’t fret: Sometimes the squealing is telling you that a build up of brake dust is present and simply needs to be removed. Drum brakes in particular can be affected by brake shoe dust, but pulling the drums and hitting them with a quick shot of brake cleaner can do wonders. Your brakes may never be squeak free, but with the dust removed, they’ll be quieter to the touch.

3. Screaming brakes when the brake pedal is applied.

Step on the brakes and you don’t hear squealing, instead, you hear a more vigorous and loathsome noise, one that puts your teeth on edge and gets the attention of everyone nearby.

It’s at this point the brake wear indicator warning has been superseded by metal on metal contact. The brake pads are worn down and the metal backing plate is now rubbing up against the brake rotor.

Guess what? This is a serious safety issue. Make the repairs immediately or take your car to a mechanic. You can also expect to be informed that a resurfacing the rotors is required. In a worse case scenario, damage to the rotors may be so severe it’s time for replacement.

Beyond Brake Noise

Brake noise is not the only indicator of trouble. If the vehicle pulls to the left or to the right when you brake, it may point to a possible alignment issue. Shaking that happens only when applying the brakes can indicate a warped rotor. Also, if the brake pedal feels spongy to the touch or travels closer to the floor than usual, the master cylinder may be giving out. It could be something else, but neither problem should be ignored.

Check out all the brake system parts available on NAPA Online or trust one of our 16,000 NAPA AutoCare locations for routine maintenance and repairs. For more information on brake noise, chat with a knowledgeable expert at your local NAPA AUTO PARTS store.

Photo courtesy of Matthew Keegan.

about author

Matthew C. Keegan

Matt Keegan has maintained his love for cars ever since his father taught him kicking tires can be one way to uncover a problem with a vehicle’s suspension system. He since moved on to learn a few things about coefficient of drag, G-forces, toe-heel shifting, and how to work the crazy infotainment system in some random weekly driver. Matt is a member of the Washington Automotive Press Association and is a contributor to various print and online media sources.

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