How do I properly check and refill brake fluid in an Audi A4?

I recently bought a used Audi A4 and I want to make sure its brake fluid is at the right level. How can I properly check and refill the brake fluid in my Audi A4?

First, locate the brake fluid reservoir under the hood of your Audi A4. It is typically located near the firewall, on the driver's side of the car. Make sure the fluid level is between the minimum and maximum markings on the reservoir.

If the brake fluid level is low, you can add more by unscrewing the cap on the reservoir and pouring in the recommended type of brake fluid for your Audi A4. Make sure to use a funnel to avoid spillage.