If you own a 2013 Freightliner Cascadia 125 and need to replace a failed cab suspension airbag, the right part number is critical. A wrong fit can compromise ride quality or even cause damage. This guide covers OEM numbers, common aftermarket alternatives, how to identify your current airbag, and what to check before purchasing.
Shop on Amazon
Browse the latest options and prices.
2 Pack Cabin Sleeper Air Spring Bag & Cab Air Suspension Compatible with Freightliner Cascadia, Colu
Understanding the Cab Suspension Airbag on a 2013 Cascadia 125
The cab suspension airbag (also called an air spring or air bladder) supports the cab over the chassis, absorbing road shocks. The 2013 Cascadia 125 uses an air-over-hydraulic or full pneumatic cab suspension system, depending on the build. The airbag is located between the cab frame and the chassis rail, usually one on each side near the front cab mounts. Over time, rubber drys out, cracks, or develops leaks, requiring replacement.
OEM Part Numbers for 2013 Cascadia 125 Cab Airbag
Freightliner sources cab airbags from several suppliers. The most common OEM part numbers for the 2013 Cascadia 125 include:
- A30-49639-000 – This is a common Freightliner OEM number for the cab suspension airbag assembly. It often comes with mounting studs and fasteners.
- A30-49639-001 – A variant that may include a different height or fitting type. Always verify with your VIN.
- A30-49641-000 – Sometimes used for the right or left side, but symmetrical on many models.
Check the part number tag on the airbag itself (usually a white sticker or metal tag). The number often begins with "A30" or "A32." If the tag is missing, look at the part number on the air suspension control valves or the height sensor linkage; they sometimes reference the bag.
Aftermarket Cross-References for 2013 Cascadia 125 Cab Airbags
If you want to save money or find a faster replacement, several aftermarket brands offer direct fit airbags. Always confirm dimensions before ordering.
Firestone Air Springs
Firestone is a leading manufacturer. Their part number W01-358-8432 (or similar) matches the 2013 Cascadia 125 cab airbag. Firestone also offers a complete assembly with brackets, part number W01-358-8437. Firestone airbags are known for durability and are used by many truck fleets.
Hendrickson Air Springs
Hendrickson provides cab suspension components for heavy trucks. Their equivalent part number for the 2013 Cascadia 125 is R1110-01-00 or R1110-02-00, depending on the specific configuration. Hendrickson air springs often have a molded rubber bellows with steel end plates.
Continental ContiTech
Continental offers cab air springs under the ContiTech brand. The part number A30-49639-000 is also sold by Continental as a direct replacement. You can also find their aftermarket number N02018-0003.
Other Compatible Brands
- Goodyear – Part number 1R12-309 (verify dimensions).
- Stemco – Offers air springs under the Garlock family; check their cross-reference guide.
- Triangle Air Spring – Their number TA-1106 is often listed for Cascadia 125.
How to Identify the Correct Airbag on Your Truck
Before ordering, confirm these three things:
1. Visually Inspect the Tag
Locate the airbag between the cab and frame. Clean off dirt and look for a white rectangular sticker. Write down the numbers. If only a brand logo is visible, search that brand’s catalog with your truck’s year, make, and model.
2. Measure the Airbag
If the tag is missing, measure the following:
- Overall height when deflated (usually around 6-8 inches for a collapsed bag).
- Diameter of the bellows (typically 6-8 inches).
- Distance between mounting holes (center to center) on the top and bottom plates.
- Bolt size and thread (most are 3/8-16 or M10).
Compare these to dimensions listed in online catalogs from Firestone, Hendrickson, or Continental.
3. Check Your VIN and Build Sheet
Use your VIN to access the OEM parts catalog through a Freightliner dealer or online parts portal. The build sheet may specify the cab suspension type (e.g., "Aero X" vs. "Modern"). This helps narrow down the exact airbag.
Common Replacement Scenarios and Tips
- Leaking airbag: If you hear a hiss or the cab sags on one side, the rubber bellows likely have a crack. Replace both sides at the same time for balanced ride.
- Aftermarket vs. OEM: OEM bags are identical to original, but cost more. Aftermarket bags from reputable brands work just as well if certified to SAE standards. Avoid unbranded cheap bags.
- Installation: Airbag replacement typically requires removing the cab skirt, disconnecting the air line, unbolting the old bag, and installing the new one. An air suspension specialist can do it in under an hour per side.
- Air leaks after replacement: Check the O-rings on air fittings. Use soapy water to find leaks. Torque mounting bolts to spec (usually 30-40 ft-lbs).
Where to Buy the 2013 Cascadia 125 Cab Suspension Airbag
While we avoid naming specific retailers, you can purchase from:
- Freightliner dealerships (OEM only, usually higher price but exact fit).
- Heavy-duty truck parts suppliers (online or local — they often stock Firestone, Hendrickson, or Continental).
- Fleet specialty stores (they may offer bulk discounts for multiple bags).
Always verify the part number with the supplier’s fitment chart. Provide your VIN or the original part number if possible.
Final Recommendation
For a 2013 Freightliner Cascadia 125 cab suspension airbag, start by locating the OEM number on the existing bag. If that’s not possible, use the measurements and your VIN to order either the Freightliner A30-49639-000 (OEM) or the Firestone W01-358-8432 (aftermarket). Both are reliable and widely available. Replace both airbags at once to avoid uneven wear. After installation, perform a leak test and check the cab height adjustment. With the correct part, your Cascadia will ride smooth for hundreds of thousands of miles.