Freightliner Air Spring Bag – Replaces W01-358-9781 / W01-377-8537 / W01-377-8536
Warranty Information
ROADWEST stands behind the parts we sell. Unless otherwise stated on the product page, your purchase is covered by a 1-Year Limited Warranty against manufacturing defects under normal use.
What’s covered
- Defects in materials or workmanship
- Premature failure caused by factory-related issues
What’s not covered
- Normal wear and tear, cosmetic aging, corrosion from environment/road salt
- Damage from improper installation, incorrect wiring, modifications, misuse, or accidents
- Labor costs (installation/removal), downtime, towing, or other indirect costs
How to file a claim
Contact us with:
- Order number
- Product name / SKU
- Clear photos or a short video showing the issue
If approved, ROADWEST will provide an appropriate resolution (replacement parts, replacement unit, or refund/credit).
Please do not send items back without return authorization.
For more details, see our Shipping Policy, Easy Return & Refund Policy, and Warranty pages.
Shipping & Returns
Most ROADWEST orders ship from our U.S. warehouses within 1–2 business days. Standard ground delivery in the contiguous United States is typically 1–3 business days, with freight service used for oversized or extra-heavy parts.
- Shipping area: United States only (no PO Boxes or international addresses).
- Processing time: In-stock items usually ship within 1–2 business days, Mon–Fri.
- Delivery: Standard ground or LTL freight depending on size and weight.
- Returns: Most unused items may be returned within 30 days of delivery, subject to inspection and our return guidelines.
- Costs: Original and return shipping are generally the customer’s responsibility, unless the issue is caused by ROADWEST (wrong item, damaged on arrival, etc.).
For full details, please review our Shipping Policy and Easy Return & Refund Policy before placing your order.
Upgrade the suspension performance of your Freightliner truck with the High Soar 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 High Soar 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.
| Brand | High Soar |
|---|---|
| Part Type | Suspension Air Spring Bag / Air Ride |
| Vehicle Make | Freightliner Trucks – selected applications using listed cross numbers |
| Cross Reference |
Freightliner: 681-320-0017, A16-14004-000, A16-17574-001, A16-17574-002 Firestone / Aftermarket: W01-358-9781, W01-377-8537, W01-377-8536, 1R12-603 Cross numbers are for reference only – verify details before purchase. |
| Application Position | Suspension air spring (typically rear / axle air ride) |
| Material | High-density multi-ply rubber bellows with reinforced piston & hardware |
| Function | Supports vehicle load, absorbs shock & vibration, improves ride comfort and braking stability |
| Fit Type | Vehicle Specific Fit – match by OE / cross reference number |
| Color / Finish | Black air spring assembly |
| Included Components | 1 × Air Spring Bag (replacement for listed cross references) |
| Warranty | 1 Year Limited Warranty against manufacturing defects |
If you are unsure about compatibility, please verify the original air spring number on your Freightliner or consult a professional technician before purchasing.