Why Does the Brake Make Noise When Braking?

[McAnastasia]

The reason for brake noise is worn brake pads, which need to be replaced promptly. Relevant details are as follows: 1. Brake pads are consumables that gradually wear thinner during vehicle use. When the friction layer is nearly depleted, an alarm device, namely the brake pad wear indicator, located at the edge of the brake pad will come into contact with the brake disc, producing a sharp metallic friction sound as a warning to the driver that the brake pads should be replaced. 2. Brake fluid is recommended to be replaced every 2 years. Brake fluid has certain corrosive properties and strong water absorption. Nowadays, service stations are equipped with specialized tools to measure the water content in brake fluid, allowing for a test to determine if replacement is necessary. Brake fluid must be replaced regularly according to the maintenance schedule, and it is advisable to follow the manufacturer's recommended maintenance intervals.

[SophieFitz]

When the brakes make noise, I think it could be caused by various reasons. If the brake pads are worn too thin, the metal backing plate rubbing against the brake disc will produce a sharp screeching sound, especially during sudden braking. I've personally experienced this situation—after driving for several years, the brakes started making constant noise before I replaced the pads. Another common issue is rust on the brake discs, particularly after leaving the car overnight or in rainy weather. The rust layer squeaks when you step on the brakes, but the noise disappears after a few uses once the rust wears off. Sometimes, small stones or dust can get stuck in the brake system, causing noise, but cleaning it out will solve the problem. Newly installed brake pads may also produce noise during the first few days, which is normal as they break in. Remember, ignoring this sound for a long time can pose safety hazards, such as longer braking distances, which is even more dangerous in rainy conditions. So, if the noise occurs frequently, I recommend getting it checked at a repair shop as soon as possible to avoid accidents. For daily car maintenance, regularly cleaning wheel hub dust and keeping it dry can help prevent such issues.

[SophiaRose]

The main cause of brake noise is uneven friction. When I was learning about automotive knowledge, I found out that new brake pads have a protective coating on the surface, which can produce squeaking sounds during initial use, but this usually disappears after driving a few dozen kilometers. If the brake pads are excessively worn, the metal backing plate directly rubs against the brake disc, creating a particularly sharp noise. If not replaced promptly, this can damage the disc surface, leading to more expensive repairs. Environmental factors also play a role; for example, in humid winter weather, brake discs are prone to rust, which can be resolved by lightly applying the brakes a few times. On dusty roads, accumulated debris can also cause noise. Additionally, installation issues such as loose screws or misaligned components can produce strange sounds. To address these issues, I regularly check the thickness of the brake pads and replace them if the remaining millimeters fall below the safety line. When driving, I pay attention to any unusual sounds, distinguishing between temporary and persistent abnormalities, which can save a lot of future trouble. Keeping the system clean is key to reducing unnecessary repair costs.

[DelNolan]

I drive frequently and find that most brake noises are not serious. It could be slight rust on the brake discs, or moisture after rain or washing the car, causing a squeak when braking, but it usually goes away after a few more presses. New brake pads might also squeak for the first couple of days, which is normal during the break-in period and nothing to worry about. If the noise is sharp and persistent, it might indicate that the brake pads are worn too thin, causing metal-to-metal contact and noise—this is when you should check and replace them. Sometimes, dust or small particles get stuck, and cleaning the wheel hubs can solve the issue. In daily driving, I usually tap the brakes lightly a few times to eliminate temporary noises and avoid sudden hard braking to prevent worsening the problem. Mentioning a brake check during regular maintenance can help prevent surprises and ensure safety.