Relive the first-class ride of the German flagship.
Made for the Mercedes-Benz S-Class W221/V221 diesel flagship. OEM-grade direct-fit specification cures front axle noise, ends high-speed vibration and abnormal tire wear, and protects the S-Class’s top-tier luxury comfort.
Is your W221 showing signs of an aging chassis?
The classic Mercedes-Benz W221 S-Class has an impeccably composed ride. But with age, accumulated mileage, the strong torque of the V6 diesel and the car’s weight, the rubber bushings and ball joints in the front multi-link suspension wear out much faster.
Loose front-end knocking
Dull clunks and knocks from the front wheels over uneven roads, potholes or speed bumps.
Vibration and vague feel
Unusual steering pull or vibration at high speed or under hard braking, or a loose, vague road feel.
Abnormal tire wear
Uneven tire wear that continues even after a wheel alignment.
Once chassis parts age, even Airmatic air suspension cannot filter the road perfectly. Replacing the full set is the most effective way to restore a smooth, quiet, new-car ride.
Four advantages of the COS21013 kit
Precise fit, matched to OE specification
An OEM-specification replacement part. Every ball joint, bushing hole position and arm geometry is measured with digital 3D precision for a 100% direct fit with no modification, restoring the original dynamic geometry so steering and damping work in harmony.
Extra-durable reinforced rubber bushings
A high-quality composite rubber compound with excellent tensile strength and damping performance absorbs longitudinal road shock and fine vibration, resists cracking and hardening, and preserves the S-Class’s signature magic-carpet ride.
Wear-resistant, induction-hardened ball joints
The inner ball stud is precision induction-hardened and paired with a wear-resistant dust boot and long-life high-performance grease. It stays smooth and responsive through extreme temperatures and heavy steering loads, eliminating chassis play and extending service life.
Made by CCYS Group: European-grade quality
As CTE European Chassis Specialists, every part passes strict durability, tensile and salt-spray corrosion tests before leaving the factory, delivering OEM quality at outstanding value, trusted by workshops and owners worldwide.
Detailed specifications
Frequently asked questions
What is COS21013?
COS21013 is a complete front axle repair kit from CTE for the Mercedes-Benz S-Class W221/V221 S 350 CDI rear-wheel-drive models, manufactured to OEM replacement-part standards.
Which vehicles does COS21013 fit?
It fits the Mercedes-Benz S-Class (W221, V221) S 350 CDI / BlueTEC (chassis codes 221.022 and 221.122), rear-wheel drive.
Where is COS21013 installed?
On the front axle. It is a complete left and right repair set covering the key front suspension and steering parts in one package.
Does COS21013 need any modification to install?
No. Every ball joint, bushing hole position and arm geometry is produced to OE specification for direct installation, restoring the original dynamic geometry.
What are the warning signs of an aging W221 front chassis?
Common signs are dull knocking noises from the front wheels over uneven roads, potholes or speed bumps; steering pull, vibration or vague feedback at high speed or under hard braking; and abnormal tire wear that persists after a wheel alignment.
Why replace the whole set?
Once chassis parts age, even Airmatic air suspension cannot filter the road perfectly. Replacing the full set is the most effective way to restore a smooth, quiet, new-car ride.
What manufacturing certification does COS21013 hold?
COS21013 draws on CCYS Group’s decades of European and American OEM production experience and conforms to the IATF 16949:2016 international automotive quality management system standard.
What are the weight and packaging dimensions of COS21013?
Net weight is 18.1 kg. The packaging measures 490 mm long, 435 mm wide and 220 mm high.
Professional installation advice
The S-Class multi-link chassis is highly precise and involves an advanced air suspension system. For driving safety and the longest part life, we strongly recommend installation by a professional workshop experienced with imported Mercedes-Benz and BMW vehicles, followed by a professional wheel alignment.
