What Causes the Clicking Sound During Emergency Braking?
2 Answers
It may be due to the activation of ABS. Here is relevant information about ABS: Introduction: ABS stands for Anti-lock Braking System. Function: Its role is to automatically control the braking force during car braking, preventing the wheels from locking up and keeping them in a state of rolling and sliding (with a slip ratio of about 20%), ensuring maximum adhesion between the wheels and the ground. Classification: ABS control channels are divided into four-channel, three-channel, two-channel, and one-channel types. Working Principle: During braking, ABS quickly determines the wheel lock-up state based on speed signals from each wheel speed sensor, closes the normally open input solenoid valve on the wheel that begins to lock up, and keeps the braking force constant.
With my twenty years of driving experience, there are several common reasons for the clunking sound during hard braking. The most common one is the ABS system kicking in—during hard braking, the ABS pump rapidly applies and releases the brakes to prevent wheel lock-up, producing that clunking noise, which is actually a normal safety feature. However, if the sound is accompanied by vibration, it could be a problem, such as warped or worn brake discs, like grooves or uneven surfaces causing uneven friction. Sometimes, brake pads that are too thin or loose calipers can cause parts to rattle and make noise during hard braking. I recommend regularly inspecting the brake system during maintenance, including disc and pad thickness as well as fluid levels. If the noise occurs too frequently or is accompanied by unusual sounds, it’s best to visit a repair shop immediately to ensure the brakes are stable and safe.
