Freightliner Air Spring Bag – Replaces W01-358-9781 / W01-377-8537 / W01-377-8536

Upgrade the suspension performance of your Freightliner truck with the ROADWEST Air Spring Bag, engineered as a heavy-duty replacement for select OEM and aftermarket air ride systems. This air spring bag is designed to replace popular Freightliner and Firestone-style part numbers, including W01-358-9781, W01-377-8537, W01-377-8536, 1R12-603, Freightliner 681-320-0017, A16-14004-000, A16-17574-001, A16-17574-002.

Manufactured from imported high-density rubber with multi-ply bellows construction, this air ride exceeds typical OEM requirements. The robust design offers better durability and load performance than many standard air suspension bags, helping your truck maintain proper ride height and stability under heavy loads.

By effectively absorbing road shocks and vibrations, the ROADWEST air spring helps reduce harsh impacts transmitted to the chassis and cab. This enhances ride comfort, driver fatigue reduction and braking stability, making it an ideal replacement when original air bags are leaking, sagging or damaged.

• Replacement for Freightliner applications – fits suspensions using cross numbers Freightliner 681-320-0017, A16-14004-000, A16-17574-001, A16-17574-002.
• OE cross references – interchangeable with W01-358-9781, W01-377-8537, W01-377-8536, 1R12-603 (verify specs before purchase).
• Premium quality air ride – high-density rubber bellows and reinforced piston provide excellent load capacity and long service life.
• Safety & comfort – air spring bags help prevent collision impact transfer, reduce vibration and support more controlled braking.
• Easy installation – designed as a direct replacement when matched correctly by OE / cross reference number.
• Warranty backed – comes with a 1-year warranty and 100% quality assurance for peace of mind.

Key air spring components:

• Piston – the lower section of the air spring, made from aluminium, steel or composite plastic. Provides the lower mounting arrangement via threaded holes or studs.
• Girdle hoop (centre ring) – a ring between the convolutions of convoluted-type air springs, helping maintain shape and stability.
• Bellows – the heart of the air spring, with at least four layers: an inner layer, two plies of cord-reinforced fabric and an outer protective layer for strength and flexibility.
• Bumper (bump stop) – a solid moulded rubber fail-safe device used in many suspension applications to help prevent excessive damage if air pressure is suddenly lost.

Fitment reminder:

• This is not a universal air spring.
• Check the part number on your original air bag or your suspension spec sheet.
• Only purchase if your system uses one of these numbers: 681-320-0017, A16-14004-000, A16-17574-001, A16-17574-002, W01-358-9781, W01-377-8537, W01-377-8536, 1R12-603.
• If you are unsure, consult your mechanic or parts manager before ordering.

If you are unsure about compatibility, please verify the original air spring number on your Freightliner or consult a professional technician before purchasing.