BMW Air Duct Left (M) - Genuine BMW 51717894699

Product Information

A brake air duct is a component in a vehicle’s braking system that channels cool air from the outside toward the brake rotors and calipers. Its purpose is to reduce brake temperature, prevent brake fade, and help maintain optimal braking performance during high-demand situations like towing, spirited driving, or repeated stops.

• Increased Brake Fade: Brakes may lose responsiveness after repeated or heavy use due to overheating.
• Excessive Brake Dust or Heat Damage: Overheated brakes can leave more dust or cause rotor glazing and pad wear.
• Unusual Smells During Braking: Burning odor may result from overheated pads or rotors.

About Genuine BMW

The original parts used by BMW to build your car are available as replacement parts under the “Genuine BMW” brand. When ordering a Genuine BMW part you are guaranteed to get the same part that you would pick up from your local dealerships part department. Genuine BMW parts have been built to BMW’s stringent standards and are the same quality of the original parts used to build your Ultimate Driving Machine.

You may not realize this, but the parts that make up your BMW are not necessarily manufactured by BMW. No cause for concern, as BMW designs the part, hires a manufacturer, and ensures its quality to you. In fact, many of these manufacturers have been making parts for BMW for decades. In our industry these manufacturers are called OEM (Original Equipment Manufacturers), and these are often brands you recognize, including Lemforder, ZF, Sachs, Bosch, Valeo, Zimmermann, Siemens VDO, Corteco, and more. Don’t be surprised to open that Genuine BMW parts box and find an OEM branded part inside, simply with the addition of a BMW logo.

Be sure to keep an eye out for OE tags on our product pages to quickly identify parts coming direct from OE manufacturers. That extra bit of insight could save you some serious money while shopping! Refer to our OE Academy for further information regarding the OE/OEM tags throughout the site.