If you own a V40 and are experiencing abnormal disc brake noise, don't worry! We're here to help you resolve the issue. Here are some steps you can take to troubleshoot the problem:

Firstly, check if the screws of the disc brake are tightened in place. Loose or missing locks can cause abnormal noise. If you find any screws that are loose, tighten them up or replace the missing locks.

Next, confirm whether the disc brake is deformed. If it is, you will need to replace it. A deformed disc brake can cause abnormal noise and can also affect the performance of your brakes.

It's also important to confirm if the disc brake disc and disc brake are parallel. If they are not, adjust them to be parallel. Misalignment can cause abnormal noise and can also affect the performance of your brakes.

Check the gap between the disc brake disc and the left and right brake discs to ensure that there is no interference between the two. Interference can cause abnormal noise and can also affect the performance of your brakes.

Lastly, check if there are any foreign objects between the disc brake disc and the disc brake. If there are any, clean them up. Foreign objects can cause abnormal noise and can also affect the performance of your brakes.

We hope these steps help you resolve the abnormal disc brake noise issue. If you still experience any problems, please don't hesitate to contact our customer support team for further assistance.