Where is the brake fluid reservoir for a 2004 BMW 520i?

The brake fluid reservoir for a 2004 BMW 520i is located in the engine compartment, typically near the back of the engine bay on the driver's side. It is usually a translucent plastic container, allowing you to check the fluid level visually. To access it, you may need to remove the engine cover if it’s obstructing your view. Make sure the engine is cool before checking the fluid level.