BMW X5 Brake Squeaking Noise?
2 Answers
The causes of squeaking noise when braking generally fall into the following three categories: 1. Brake pad material issues. Most vehicles currently use semi-metallic brake pads, and if the metal content in the pads is too hard, it can produce noise during braking. 2. Uneven brake rotors. During use, brake rotors may develop uneven surfaces. When the rotor surface becomes uneven, braking is more likely to produce noise. 3. Protrusions on the edges of brake rotors due to natural wear. When replacing new brake pads, if the pads and rotors do not fully align during braking, noise may occur.
A friend who drives a BMW X5 asked me about brake noise, and I've experienced this annoying issue myself. Squeaking when starting off or lightly pressing the brakes is most commonly due to rust on the brake discs, especially after rain or washing the car when moisture causes some rust on the discs. A few more presses usually grind it off and silence returns. However, if there's a persistent sharp sound or the noise continues after driving for a while, it's time to be cautious. It might mean the brake pads are worn too thin, and the metal wear indicator is starting to scrape against the disc, signaling it's time for new pads. Ignoring it not only causes noise but can also damage the discs, leading to more expensive repairs. I recommend checking the brake pad thickness during every service—if it's less than 3mm, replace the pads immediately. Safety comes first; if braking efficiency drops, it could lead to accidents. Getting it fixed promptly at a repair shop can save a lot of trouble.
