What Causes the Zizzing Sound When Driving?
2 Answers
The reason for the zizzing sound when driving is: the brake pads have worn to their limit, causing the brake drum to come into direct contact with the vehicle. Under normal driving conditions, the front brake pads need to be replaced every 30,000 to 50,000 kilometers, while the rear brake pads can last for about 60,000 to 100,000 kilometers before needing replacement. The wear level varies depending on the driving conditions of each car. You can determine whether replacement is needed by checking the thickness of the brake pads. Typically, new brake pads are about 1.5 centimeters thick. There is a protrusion on both ends of the brake pad, approximately 3 millimeters in height. If the thickness of the brake pad is level with this indicator, it should be replaced immediately.
The car is making a squealing noise, I've seen this issue many times. It's usually a belt problem, like the alternator or AC belt being loose or worn out, causing excessive friction and squealing. Thin brake pads with metal touching the rotor also make this sound. Worn wheel hub bearings produce a humming noise with friction when rotating. Loose chassis screws can also rattle and make noise. I once drove an old car that kept making noise on the highway, and it turned out to be a bad rear bearing, which I replaced immediately. My advice is don't delay—first identify the source of the noise. For example, if it's louder at idle, it's likely the belt; if it's noticeable during low-speed braking, it could be a brake system issue. Get it checked at a repair shop—safety first, to prevent a small issue from becoming a big one.
