AUTONEWS

Are your brakes squeaking? Here’s when the sound is harmless and when you need to head straight to a mechanic

Brake squeaking can be unpleasant and worrying, but it doesn't always mean there is a serious problem with the car. However, there are situations where the sound coming from the brakes should not be ignored—especially if it recurs, gets louder, or is accompanied by vibrations and reduced braking performance.

The braking system is one of a car's most critical safety features, yet it is constantly exposed to high temperatures, intense mechanical stress, and varying weather conditions. Consequently, occasional squealing or squeaking is a relatively common occurrence, reports Autonews.

Why do brakes squeak? When braking, the brake pads press against the discs, creating friction. Under certain conditions, the pads, discs, or other components of the braking system can begin to vibrate. When these vibrations fall within the audible range, we hear them as a characteristic squeak.

The brake pads themselves aren't always the cause. The problem could stem from dirty or rusty sliding surfaces within the brake calipers. If the pads can no longer slide freely, vibrations are generated that manifest as a high-pitched, unpleasant squeak. While there is usually no immediate danger in such cases, the issue should still be checked at a service center soon. Most common causes of squeaking

Common causes include moisture, surface rust, and brake dust, as well as worn-out pads, unsuitable parts, or installation errors.

Even brand-new brake pads can produce noise initially. Therefore, it is not just a matter of whether the brakes squeak, but also when the sound occurs and how long it lasts. If the squeaking happens only occasionally and the car brakes normally, you can usually continue driving. However, if the noise persists or you notice a change in braking performance, the cause must be identified.

When is squeaking not a cause for concern? Squeaking is usually harmless if it is brief and goes away on its own. It is important that the car brakes as usual—meaning there are no changes in braking power, pedal feel, or vehicle behavior.

Moisture and a thin layer of surface rust can form on brake discs after rain, a car wash, or a period of inactivity. During the first few braking maneuvers, the pads remove this layer, which may cause a brief squeaking or scraping sound. If the noise disappears quickly, there is usually no cause for concern.

This sound should not be ignored...Pay special attention if, instead of ordinary squeaking, you hear scraping, scratching, or a metal-on-metal grinding sound. This could indicate that the brake pads are severely worn and metal is already grinding against metal. In such cases, damage to the brake discs can also occur.

Vibrations or strong shuddering during braking serve as a warning sign, potentially indicating unevenly worn or damaged discs.

The car should also be checked if it noticeably pulls to one side when braking. A particularly serious sign is reduced braking power or a sudden change in the feel of the brake pedal. In such situations, simply waiting to see if the noise goes away is not enough—the braking system needs to be inspected.

Why might new brakes squeak? Noises are not uncommon even after replacing brakes. New pads and discs need time to bed in, so the brakes should not be subjected to excessive strain during the first few hundred kilometers. If the squeaking persists beyond this period, the cause could be an installation error or unsuitable parts.

Electric cars face a specific issue...In electric vehicles, mechanical brakes are often used less frequently than in cars with internal combustion engines. The reason is regenerative braking, where the electric motor acts as a generator during deceleration, recovering some energy. While this reduces brake wear, it also has a downside: if the discs are rarely used vigorously, rust and deposits can easily accumulate on them, potentially leading to unpleasant noises.

If the squeaking is brief, simply monitoring the brakes' behavior is usually sufficient. Surface rust often disappears after a few normal braking maneuvers. However, any disassembly or repair of brake system components should be left to professionals, as this involves one of the car's key safety systems.

Your brakes are an incredibly important safety feature — perhaps the most important — so you want them working at their best when you really need them. That’s why you should have them inspected regularly; roughly every 12,000 miles is a good rule of thumb to follow. But if they’re squeaking, you need to find out why as soon as possible to prevent serious damage.

If you’re skilled enough, getting to the bottom of your brake problem can be a DIY project. Be careful, though. A brake repair must be done correctly to avoid putting drivers and passengers at risk while on the road. If you’re unsure you can safely repair your brakes on your own, seek out a professional. 

Your car’s brakes may be sounding off for myriad reasons — squeaks can indicate a range of problems, from not-too-serious to urgent. These can apply to all types of brakes: disc brakes that use pads, rotors, and calipers, or drum brakes that employ shoes, drums, and wheel cylinders. 

Here are some of the most common reasons a car’s brakes will squeal, screech, scrape, squeak, or grind:

1. Worn or damaged brakes...Modern brake pads come with a built-in indicator: a small piece of metal that makes contact with the rotor and generates a squealing or grinding sound when the brake pads reach the end of their useful life.

Warped or unevenly worn components can also be at the root of the problem, as can missing brake system hardware. 

2. Cold brakes...It’s relatively common to hear your brakes squeaking quietly when first applied after a cold start. This is due to moisture or surface rust collecting on the pads. The sound should go away eventually. However, if the brakes squeal or scrape continually, that may indicate a more serious problem.

3. High-performance brakes...The metallic and ceramic materials used in higher-performance brake pads can be inherently (and harmlessly) noisy when they make contact with each other.

4. Debris...Small stones or other solid matter can become lodged between the pad and the rotor. This debris can generate an unpleasant noise when you use your brakes. In this case, a mechanic must inspect and disassemble your brakes to clear the culprit.

5. Lack of lubrication...You may hear squealing if the backing plate in a drum braking system isn’t sufficiently lubricated. The solution here is to remove the shoes and drum, then apply lubricant to the backing plate.

6. Heavy-duty operation...If you ride the pedal while descending a steep hill or mountain road, your car’s braking components could overheat and start squealing. If this is the case, pull over and give the brakes some time to cool off once you’ve reached level ground. If the condition persists, get your car serviced.

7. Sticking caliper or wheel cylinder...A poorly lubricated caliper in a disc-braking system can get wedged against the rotor (sometimes because of improper installation). This can cause a squealing or grinding sound as it wears down the brake pads.

8. New brakes...If the brakes are new, the components may take a certain number of miles to “break in” properly and perform without squeaking.

9. Faulty brake repair or maintenance...Sometimes, a botched fix to a vehicle’s brake system causes more harm than good. For example, when a mechanic performs a brake job, they typically resurface the rotors to grind off glazing, grooves, and other imperfections. If the rotors are not appropriately refinished, squealing may occur, or the pedal may feel pulsing. Likewise, if the rotors have become too thin (3/8 of an inch or less of material remaining), a mechanic should replace them.

If you have questions or concerns about a noise you’re hearing, ask your mechanic to inspect it.