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Why Does an Automatic Car Make Noise When Releasing the Brake to Start?

2 Answers

MartinMarie

09/02/25 2:04am

This is a normal phenomenon for automatic transmission cars. The slower and lighter you release the brake, the more noticeable this sound becomes. Below are the specific reasons for this phenomenon: Pressing the brake pedal when parking: As long as the gear lever of an automatic transmission car is not in the parking gear or neutral gear, the engine will have power output, and there will also be power output at idle speed. If you want to park, you must press the brake pedal. Friction between the brake pads and brake disc: When starting, the power output from the engine has already been applied to the wheels. It's just that the braking force is greater than the power, so the wheels do not move. When the braking force is less than the power, the wheels will move. When the driver releases the brake pedal, and the power and braking force are at a critical point, the friction between the brake pads and the brake disc will produce noise.

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May

09/14/25 4:28am

The other day when I started my automatic transmission car, I heard a creaking sound as I released the brake pedal. After talking with the mechanic at the repair shop, I learned this is actually quite common. Most often, it's caused by friction between the brake pads and rotors - especially after rain when the rotor surface rusts, releasing the brake can produce brief unusual noises. If the car sits unused for extended periods, dust or moisture buildup on the rotors can cause squeaking from the brake pad edges rubbing against the caliper bracket. Another possibility is worn brake pads; when the warning indicator touches the rotor, it creates a sharp metallic sound. My mechanic warned that if the noise comes with steering wheel vibration or spongy brakes, it might indicate warped rotors requiring immediate replacement. Don't panic about occasional brake noise - maintain steady speed for a while and if the sound disappears, it's usually normal. But if the noise persists for several days, it's best to get the braking system inspected.

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