What Causes the Brake Squealing in BMW X5?
2 Answers
The brake squealing in BMW X5 is often caused by insufficient break-in of new brake pads and rotors. Below are the specific reasons for brake squealing: 1. Improper installation of brake pads: When new brake pads are installed without resurfacing the old rotors, it leads to poor contact. This mismatch or failure to resurface the old rotors before installing new pads causes direct friction between the new pads and the uneven surface of the old rotors, resulting in uneven wear on the new pads. 2. Brake system malfunction: There might be defects in the brake system itself, causing the brake pads to only partially contact the rotors. This increases the pressure per unit area on the brakes, leading to squealing. It is recommended to inspect components such as calipers and guide pins. 3. Presence of foreign objects: Foreign objects can cause poor contact between surfaces, resulting in squealing.
My BMW X5 also had brake squealing noises a while ago, that annoying screeching sound. I figured it might be the brake pads worn to their limit, or rust on the disc surface, especially noticeable after driving in the rain. Some car owner friends told me that foreign objects stuck between the pads and disc could also cause this, like sand or small stones. Upon inspecting my car, I found the brake pads were nearly worn out, and the disc surface was slightly uneven, both leading to uneven friction. More seriously, if the bolts weren't tightened properly during installation, the whole system would shake when braking, creating even louder noises. I recommend going to a 4S shop for a check-up as soon as possible—don't ignore it, as it concerns driving safety. Brake failure could have unimaginable consequences. Regular maintenance is essential, and using high-quality parts can extend their lifespan. I tried removing the foreign objects myself, and it became much quieter, but if the symptoms persist, a technician should diagnose the specific cause.
