Air Suspension category referenceSpecial order · Estimated lead time: typically 2-4 weeks
14-18 BMW 4 Series Sedan - Airtech Air Suspension
Choose year, make and model to confirm this application-specific product fits — you can add it to your cart either way.
Verify fitment- Two front air strut assemblies and two rear air strut assemblies
- Tool kit: spanner wrenches, damping adjustment knobs and application-specific brake line brackets
- Owner's manual
One approved application: 2014–2018 BMW 4 Series · F32 · Coupe 428i, 435i, · Excludes xDrive, M-Technik, EDC
Choose an available option for each required item to enable Add to cart: Electronic Damping Option. Options marked “Contact for quote” require a KSport quote and cannot be added directly.
- Ships from Mesa, AZ
- 12-month limited warranty
- Special order: typically 2-4 weeks
Specifications — CBM250-ASO
Product details
This Airtech strut set is listed for the 2014 to 2018 BMW 4 Series coupe, chassis F32, in 428i and 435i form; the page excludes xDrive, M-Technik and EDC cars. It is a bolt-on air strut package covering front and rear corners, intended to pair with whatever air management you choose, since none is included.
Why air on a 4 Series? Because the air spring gives near-infinite ride height adjustment, with a stated range of 0 to 120/200 mm depending on vehicle, while 36 levels of damping on every strut let you soften it for the commute or sharpen it for a canyon road. The lower mounts adjust too, which fine-tunes height at any pressure.
The kit holds two front and two rear strut assemblies, spanner wrenches, damping knobs, application-specific brake line brackets and an owner's manual. An optional KSport Electronic Damping Cancellation Kit, EDCBM250, is available for this application; the page describes it as eliminating the trouble codes that appear when you upgrade suspension on cars with electronically-regulated dampers. Have the work done professionally, because OEM top mounts may need modification, and recheck air-line connections after 500 miles or one month. The 3 Series from 2012 to 2018 is also listed, so verify fitment with the year, make and model checker.
Supported features
Designed for easy bolt-on installation and compatible with most air management systems on the market.
Near-infinite ride height adjustability from the air spring plus 36 levels of damping adjustment on each strut.
Crafted from high-quality metals and rubber compounds, proven to handle daily driving and track use, with superior resistance to road contaminants.
Fine-tune ride height at any pressure through the adjustable lower mount.
Compatible applications (2)
Choices for this system
Not included. These struts work with most air management systems; a complete KSport system is listed separately for this vehicle.
Installation
Professional installation is recommended. Modification to the OEM top mounts may be required on some applications. Recheck all air-line connections after the first 500 miles or one month, whichever comes first.
Air suspension setup and careWarranty & service
12-month limited warranty to the original purchaser against defects in materials and workmanship. Racing use, exterior finish and improperly installed or modified parts are not covered; keep your original invoice for any claim.
Warranty terms and service requestsOther published pages for MPN CBM250-ASO
These page names share this MPN; they do not confirm fitment. Verify your vehicle before ordering.