What Causes the Metal Friction Sound When a Car is Driving at Low Speed?
1 Answers
Causes of metal friction sound when a car is driving at low speed include: 1. Friction between the brake disc and brake pads; 2. Damaged brake pads, which should be replaced. Methods to identify car sounds: 1. Correctly distinguish between normal sounds and abnormal sounds: To avoid unnecessary disassembly, it is essential to first differentiate between normal and abnormal sounds. Normal sounds include vibrations from various system components (e.g., noise from the engine surface), gear impact sounds during shifting, intake and exhaust sounds from gas-operated sources, and gear meshing noise. Abnormal sounds (or unusual noises) can be categorized based on their impact on the car's performance as minor, moderate, or severe. 2. Minor sounds: Examples include the sparking sound from high-voltage electrical leakage or slight looseness in rolling bearings. These sounds are generally low in volume, indicate minor wear on components, and show no significant changes over a long period. Such issues can be left unaddressed without affecting the car's normal operation. 3. Moderate sounds: Examples include noises from the flywheel bearing or clutch release bearing. These sounds significantly affect the car's performance but can still sustain its main technical functions in the short term. These noises are usually louder, and the components show more wear. They should be repaired promptly. If such sounds occur during a trip, temporary measures can be taken. 4. Severe sounds: Examples include severe noises from the crankshaft bearing or connecting rod bearing, accompanied by a drop in oil pressure, noticeable gear clashing in the transmission, or strong vibration from the differential. These sounds have a severe impact on the car and may cause or have already caused significant damage to components. Such issues must be taken seriously, and the car should be stopped immediately for inspection. Driving under these conditions is strongly discouraged, as it can lead to major mechanical failures.
