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What Causes the "Clunk" Sound When Braking in BMW 3 Series?

2 Answers

DeAmir

07/29/25 2:02pm

BMW 3 Series brake noise is caused by excessive wear of the brake discs or uneven wear due to the driving habits of the owner. Below are the specific explanations for BMW: 1. Background: BMW cars refer to vehicles produced by Bayerische Motoren Werke AG (abbreviated as BMW), with main series models including 1, 2, 3, 4, 5, 6, 7, and 8. BMW is renowned worldwide for producing luxury cars, motorcycles, and high-performance engines. 2. Logo Meaning: The BMW logo features a double-circle design with the word "BMW" inscribed above the double circles. The entire emblem resembles the blue sky, white clouds, and a continuously rotating propeller, symbolizing BMW's long-standing history and its consistent mission and goals. It reflects the company's commitment to meeting customers' greatest desires with the latest technology and advanced concepts, showcasing its dynamic spirit and ever-evolving new image, while indicating the superior quality, technological leadership, and global presence of BMW cars.

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DiMaddox

08/13/25 5:48am

When I noticed a 'clunking' noise from the brakes of my BMW 3 Series, my first reaction was to check the condition of the brake pads and discs. This sound typically stems from uneven wear or hardening/aging of the brake pads causing unstable friction, especially during high-speed braking. Rust or pitting on the brake disc surface often triggers such noises, particularly when rust accumulates in humid conditions after rain. Seized brake calipers are another common factor, creating uneven braking pressure that results in clunking sounds. Additionally, loose small components in the braking system (like untightened screws) or dust particles stuck in the caliper can also cause this noise. I recommend prompt inspection at a professional shop, as neglect may lead to reduced braking performance or more serious failures. The BMW 3 Series' braking system is quite sensitive, so routine maintenance should include regular checks of pad thickness and disc surface smoothness.

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