What Causes the Abnormal Noise When Braking in an Automatic Transmission Car?

[SanKhloe]

Automatic transmission cars may produce abnormal noises when braking due to normal ABS activation or electronic linkage. Below are the detailed explanations: Normal ABS Activation: The working process of ABS is actually a cycle of locking and releasing, keeping the vehicle in a state of critical lock-up with intermittent rolling. When you press the brake pedal hard enough to trigger the ABS, it may produce a clunking sound, which is normal. In this case, simply press the brake pedal firmly to the floor. Gear Shift 'Clunk' Sound When Braking in an Automatic Transmission Car: If you hear a 'clunk' sound between the transmission and the gear lever when pressing the brake pedal, the main cause may be the electronic linkage between the braking system and the automatic transmission. Pressing the brake activates the transmission solenoid valve, producing the 'clunk' sound. This serves as a safety reminder, requiring you to press the gear lever lock button to shift gears.