What Causes Squeaking Brakes at Low Speeds?
3 Answers
The reasons for squeaking brakes at low speeds: If the car is new, brake noise is normal because new brake pads require a break-in period to increase the contact area between the brake pads and discs, ensuring better braking performance. Additionally, severe tire wear, foreign objects on the brake pads, incorrectly installed or mismatched brake pads, or excessively thin brake pads can also cause brake noise. When you notice brake noise while driving, it's essential to stop and inspect the cause promptly to eliminate potential safety hazards. Foreign objects in the brake discs, such as sand or metal particles, can produce sharp noises when braking. In such cases, using a high-pressure water gun during car washing can help remove these particles. Failing to clean them promptly can accelerate brake pad wear and, in severe cases, damage the brake discs.
My car makes a squeaking noise when braking at low speeds, which is usually because the brake pads have worn down to their limit. I remember it was the same before I last replaced the brake pads—the squeaking was especially noticeable, particularly during stop-and-go driving in the city. The mechanic explained that when the brake pad material gets thin, the metal backing plate comes into contact with the brake disc, causing friction noise. Additionally, dust or sand getting into the brake system can get stuck in the gaps and create noise. Also, after rain or in humid weather, the disc surface tends to rust, and lightly applying the brakes can scrape off the rust layer, leading to unusual sounds. I recommend checking the brake pad thickness regularly—generally, they should be replaced if they're below three millimeters. Otherwise, not only is the noise annoying, but braking performance can also degrade, affecting safety. If the noise is occasional, you can try slamming the brakes a few times to clear out debris, but for long-term solutions, it's best to have a professional mechanic inspect the system.
A squeaking noise during low-speed braking, based on my observations, commonly stems from installation issues. I've encountered this several times when new brake pads weren't fitted tightly enough, leaving slight gaps that cause friction noises during braking. Another cause is surface corrosion or oxidation on the brake discs, especially after exposure to humid conditions, resulting in squeaks with light braking. The material of the brake pads also plays a role—low-quality pads or harder materials are more prone to unusual noises. Additionally, don't overlook the brake wear indicators; when the pads wear down to a certain point, the small metal tab intentionally makes noise to signal replacement. To prevent potential hazards, I always ensure components are clean and free of debris during inspections, and I make sure installations are done firmly to avoid looseness. Regular maintenance can reduce noise, particularly after rainy days when it's important to drive and activate the brake system to prevent rust.
