Why does the car make noise when braking at the beginning?

[AdelynAnn]

There are two main reasons why a car makes noise when braking at the beginning: 1. Hard spots on the brake disc: This is caused by harder material during manufacturing, and the noise will disappear after the brake pads wear down these spots; 2. Severe wear of the brake disc and pads, resulting in metal-to-metal contact, which also produces noticeable noise. Solutions: 1. For hard spots, a simple method is to drive in reverse at about 5 km/h and apply the brakes a few times to remove the hard spots. If the noise is not too loud, it can usually be ignored as it does not affect driving; 2. If it is metal-to-metal contact, the brake disc and pads should be replaced immediately. Additionally, if the brake warning light on the dashboard is not activated, the sensor connected to the brake warning light should also be checked for any issues.

[CaliAnn]

I find it quite common for cars to make noise when braking right after starting, such as when the disc brake rotors develop a thin layer of rust, especially after rainy days or prolonged inactivity, causing a sharp squealing sound when driving in the morning. Another reason is the accumulation of dust or sand on the brake pads, which can produce a squeaking noise during friction. Newly installed brake pads often behave this way initially, requiring a week or so of breaking in to quiet down. This isn't a major issue as long as the noise stops after a few instances. However, if the noise persists or is accompanied by unstable braking, it might indicate loose calipers or debris stuck in the system, necessitating an immediate visit to the auto shop. I often encounter this with my older car, particularly in winter when metal contracts in the cold, making it more prone to noise, but it usually resolves after the car warms up.

[OLilliana]

As a seasoned driver with decades of experience, I've encountered the issue of squeaky brakes upon startup quite a few times. Most often, it's due to rust on the brake discs, which forms overnight in humid air or when parked in underground garages. A light press on the pedal produces a squeak, but it usually disappears after driving a few hundred meters. Dust accumulation between the brake pads can also cause noise, as can residual moisture after car washing. I remember when I got new brakes installed, the shop mentioned that the noise would naturally subside after a few days of driving as the surfaces wore in. Safety-wise, don't take it lightly—a brief squeak is fine, but persistent screeching could indicate excessive part wear, so getting it checked promptly is crucial. Regular maintenance to clear debris around the brakes can prevent many of these issues.

[DelCatherine]

The sudden squealing of brakes during initial driving is primarily attributed to temporary rusting or break-in issues. When the metal surface of the brake discs gets wet and oxidizes, the initial friction from braking removes the rust particles, causing noise. Newly installed components may also squeak a few times until they become smooth and properly seated. This is not a malfunction signal, and the noise typically stops after one or two normal braking operations. However, persistent abnormal sounds should prompt a check for clean and securely fastened calipers.

[MirandaLynn]

I've noticed that the squeaking noise during car startup and braking is often caused by environmental changes, such as prolonged parking or high humidity, which can lead to rust spots on brake discs causing friction squeaks. Improper cleaning leaving sand and dust can also cause this. A simple solution is to drive more frequently to allow components to adapt, and pay attention to dryness when parking in underground garages. If the abnormality persists, it's recommended to simply check if the brake pads have sufficient thickness, avoiding unnecessary expenses on major repairs.

[DiHaley]

This noise is usually triggered by minor factors, such as temporary rust or dirt buildup on the brake disc surface. It occurs more frequently in winter when the metal contracts in low temperatures, causing a squeak. Newly replaced brake components also need a few rounds of driving to break in and become silent. I've encountered strange noises when braking after a long holiday, but they subsided after driving for a while, with no impact on driving. However, if the sound changes tone or becomes excessively harsh for an extended period, it may indicate a deeper fault warning, such as insufficient brake fluid or aging components. Early professional inspection is recommended to ensure safe driving.