What Causes the Abnormal Noise When Braking?
2 Answers
ABS's working process is actually a cyclic process of locking-releasing-locking-releasing, keeping the vehicle in a state of intermittent rolling at the critical lock point. When you press the brake pedal hard and trigger the ABS, a clunking sound will occur, which is normal. In this case, just press the brake pedal firmly to the end. Here is an introduction to the abnormal noise from the gear when braking: 1. If you hear a "clunk" sound between the transmission and the gear lever when stepping on the brake pedal, the main reason for the sound may be the electronic linkage between the brake system and the automatic transmission. When you step on the brake, the transmission solenoid valve will open and make a "clunk" sound. At this time, you need to press the gear lever lock button to shift gears. 2. If the clunking noise also occurs during light braking, or if the vehicle does not have an automatic transmission lock button at all, or if the noise is continuous or intermittent, then you need to pay attention. It is very likely that the brake system has malfunctioned or a connecting component in the chassis has become loose.
A squeaking noise when pressing the brake pedal is usually caused by common component issues. I suspect it might be due to severely worn brake pads—after prolonged use, the thinning material can produce a high-pitched sound—or rust/scratches on the brake discs. Another possibility is loose caliper components with trapped sand or debris, causing friction noise when braking. Some new cars may also produce such sounds right after brake pad replacement, which is normal during the break-in period. For self-inspection, use a flashlight to check the brake pad thickness; replace them if below 3mm. Remember, regardless of the cause, never ignore such noises—visit a certified repair shop promptly for diagnosis. Safety first.
