Common symptoms that you need brake fluid include the brake warning light staying on in your BMW.
What you will need
- Open Hood. Pull the hood release under the dashboard to release the hood.
- Locate the brake fluid reservoir on your BMW 3-Series. Clean the brake fluid reservoir with a clean cloth. The brake fluid reservoir is below the plastic cover on the driver's side. You will need to remove the plastic cover to access the reservoir.
- Determine Low/Max level. Check brake fluid level on BMW 3-Series. Determine the current brake fluid level by looking at the maximum and minimum marks on the reservoir's side.
- Add the recommended brake fluid. Add brake fluid until the level is just below the MAX/Full mark. Do not fill the brake reservoir with brake fluid all the way to the top.
These instructions apply to 2004-2013 BMW 3-Series models such as 316i, 318i, 320i, 323i, 325xi, 328i, 330i, 335i, 320d, 325d, and M3