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Why does my car make a knocking sound when I brake?

If your car is making a knocking sound when you apply the brakes, it could be an indication of a problem with your vehicle's braking system. This issue requires prompt attention to prevent further damage and ensure your safety on the road.


Potential Causes of the Knocking Sound


There are several possible reasons why your car might be making a knocking sound when you brake:



  • Worn brake pads: As brake pads wear down over time, the metal backing of the pads can come into contact with the brake rotor, causing a knocking or grinding sound. This is a sign that the brake pads need to be replaced.

  • Loose or worn brake components: Loose or worn brake components, such as the brake caliper, brake hardware, or brake rotor, can also cause a knocking sound when braking. This can be due to normal wear and tear or improper installation.li>
  • Warped or damaged brake rotors: If the brake rotors are warped or damaged, they can cause the brake pads to vibrate and create a knocking sound. This can happen due to excessive heat, uneven wear, or a problem with the brake system.

  • Suspension issues: Problems with the suspension system, such as worn ball joints or control arms, can also contribute to a knocking sound when braking. This is because the suspension components are responsible for keeping the wheels properly aligned and stable during braking.


If you're experiencing a knocking sound when braking, it's important to have your vehicle inspected by a qualified mechanic as soon as possible to identify and address the underlying issue.


Addressing the Knocking Sound


Once the cause of the knocking sound has been identified, the appropriate repair or replacement of the affected components will be necessary to resolve the issue. This may include:



  • Replacing worn brake pads

  • Tightening or replacing loose or worn brake components

  • Resurfacing or replacing warped or damaged brake rotors

  • Addressing any suspension-related problems


It's important to address the knocking sound promptly to ensure the safety and reliability of your vehicle's braking system. Ignoring the issue could lead to further damage and potentially dangerous driving conditions.

Kevin's Auto

Kevin Bennett

Company Owner

Kevin Bennet is the founder and owner of Kevin's Autos, a leading automotive service provider in Australia. With a deep commitment to customer satisfaction and years of industry expertise, Kevin uses his blog to answer the most common questions posed by his customers. From maintenance tips to troubleshooting advice, Kevin's articles are designed to empower drivers with the knowledge they need to keep their vehicles running smoothly and safely.