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What Causes the Squeaking Sound When Braking at Low Speed in a BMW 3 Series?

3 Answers

SanGiselle

07/29/25 3:50pm

BMW 3 Series low-speed braking squeaking is caused by sand between the brake pads and brake discs, which can be resolved by disassembly and cleaning. Below is relevant information about brake pads: Function: Automotive brake pads, also known as brake linings, refer to the friction materials fixed on the rotating brake drums or discs of the wheels. The friction linings and blocks within them withstand external pressure to generate friction, thereby achieving the goal of vehicle deceleration. Material: Automotive brake pads are generally composed of steel plates, adhesive heat insulation layers, and friction blocks. The steel plates are coated to prevent rust, and the coating process is monitored using an SMT-4 furnace temperature tracker to ensure the temperature distribution during coating meets quality standards.

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VanDakota

08/15/25 3:37am

I've been driving a BMW 3 Series for several years, and recently I've been bothered by squeaking noises when braking at low speeds. After discussing with friends, I found that this is mostly due to severely worn brake pads. When the thickness is insufficient, they rub against the brake discs and produce noise, especially at low speeds when the wheel speed is slow and the pressure is low, making the sound more noticeable. It could also be due to scratches or rust on the brake disc surface, trapping dust or metal shavings. It's recommended to go to a repair shop for inspection, cleaning, or replacement of parts as soon as possible. Otherwise, continuing to drive may affect braking performance. In fact, maintaining the brake system is quite simple. You should check the thickness or clean it every 20,000-30,000 kilometers. Prevention is much cheaper than repairs, and it also ensures safe driving.

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LaAnthony

08/15/25 3:38am

I have a good understanding of automotive technology. The squeaking noise when braking at low speeds in a BMW 3 Series, I believe, stems from friction issues in the brake components. At low speeds, uneven adjustment of braking force intensifies vibrations and noise, commonly caused by hard brake pad materials, metal-to-metal contact after wear, or accumulated dirt on uneven brake discs. Solutions include professional resurfacing of the discs or switching to softer brake pads, such as ceramic ones, which produce less noise. It's important not to overlook minor issues, as prolonged squeaking can shorten component lifespan. By the way, brake fluid should also be changed regularly to maintain system lubrication and reduce friction-induced noise.

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Where is the Start Button on the Audi A7?

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