For Peterbilt Air Spring Bag – W01-358-8864 / WA01-8864C

Restore and upgrade your truck suspension with the ROADWEST W01-358-8864 Air Spring Bag, engineered as a heavy-duty replacement for selected Peterbilt and Kenworth air ride systems. This suspension bag is designed to match cross reference numbers W01-358-8864 and WA01-8864C, ensuring a reliable fit when correctly matched to your existing part.

Constructed from imported high-density rubber with multi-ply bellows, the ROADWEST air spring exceeds typical OEM requirements. It offers better durability, higher load capacity and longer service life than many standard air suspension bags, helping your truck maintain proper ride height and stability under varying loads.

By effectively absorbing shocks and vibrations, this air spring bag helps reduce physical impact transmitted to the cab and chassis. The result is improved ride comfort, reduced driver fatigue and more stable braking, especially on rough roads or under heavy loads.

• Direct replacement – designed to replace air springs using cross reference numbers W01-358-8864 and WA01-8864C on selected Peterbilt and Kenworth trucks.
• Premium air ride construction – high-density rubber bellows and reinforced piston/base help deliver excellent load support and long-lasting performance.
• Safety & comfort – air spring bags help prevent harsh collision impacts, reduce the risk of passenger injury and improve braking stability by smoothing road vibrations.
• Better driving experience – smoother ride, less bounce and more controlled handling after worn or leaking air bags are replaced.
• Easy installation – when matched by part number, this bag is designed as a direct replacement, typically without major modifications.
• Warranty support – includes a 1-year warranty and 100% quality assurance for added peace of mind.

Key air spring structure:

• Piston – the lower section of the air spring, made from aluminium, steel or composite plastic, providing the lower mounting arrangement with threaded holes or studs.
• Girdle hoop (centre ring) – ring between the convolutions of a convoluted-type air spring that helps maintain shape and stability.
• Bellows – the heart of the air spring, built from at least four layers: an inner layer, two plies of cord-reinforced fabric and an outer protective layer.
• Bumper (bump stop) – solid moulded rubber fail-safe device used on many suspension applications to help protect the vehicle and suspension in the event of sudden air pressure loss.

Fitment reminder:

• This is not a universal air spring.
• Always confirm the part number on your original air bag or suspension specification before ordering.
• Only purchase if your existing air spring matches one of these numbers: W01-358-8864 or WA01-8864C.
• If unsure, consult your mechanic or parts manager to verify compatibility.

If you are not sure whether this air spring fits your suspension, please confirm your original part number or consult a professional technician before purchasing.