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What Causes the Noise When Shifting to Reverse Gear and Braking?

1 Answers

OAmelia

07/29/25 4:34am

It is normal to hear a noise when shifting to reverse gear and braking, as this sound is caused by the friction between the brake pads and the brake disc. The vehicle's braking system mainly consists of a vacuum booster pump, master brake cylinder, wheel brake cylinder, brake pads, and brake disc. When the driver presses the brake pedal, the vacuum booster pump provides assistance, making it easier for the driver to press the pedal. The vacuum booster pump only operates when the engine is running. After the engine is turned off, the vacuum booster pump cannot provide assistance. The vacuum booster pump is located in the engine compartment. After opening the engine hood, you can see a black metal disc below the windshield on the driver's side. This disc is the vacuum booster pump. In front of the vacuum booster pump is the master brake cylinder, which has a reservoir for holding brake fluid. The operation of the vehicle's braking system relies on brake fluid. When the brake pedal is pressed, the master brake cylinder uses the brake fluid to push the pistons in the wheel brake cylinders, which then press the brake pads against the brake disc, allowing the vehicle to decelerate. Brake fluid needs to be replaced regularly because it is a liquid that easily absorbs moisture. Absorbed moisture can reduce braking force and increase stopping distance.

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