MAKEXCAR currently groups its relevant products as Air Spring Bags. The complete air strut in this article is an external comparison category, not a statement that MAKEXCAR lists or supplies an integrated strut. Every product's actual content, connectors, mounts and application must be checked against its individual listing and supplier documentation.
Start with the vehicle's suspension architecture
Some air-suspension systems place the air spring and shock absorber as separate components; others package the air spring around a damper as a strut unit. Arnott's technical overview explicitly distinguishes air-suspension struts from air springs used with separate shock absorbers. That distinction is more useful for sourcing than a vague name such as “air shock.” Ask the vehicle technician or parts catalog which architecture is present at the axle and corner being repaired.
Record make, model, market, production range, axle, side, suspension option or chassis code, OE reference and current part label. Air-suspension changes can occur within one model family, so a broad model-year range is not sufficient on its own. Note whether electronic damping, height sensing or a separate pressure line is present in the vehicle, but do not assume any electrical or pneumatic connector is included with a quoted air spring. The exact SKU drawing and package list decide that.
At the RFQ stage, clarify whether the buyer wants only a pneumatic spring component, an air spring assembly with specific end closures, or a complete damper-and-spring strut. The word “bag” can be informal and may refer to different levels of assembly. Ask the supplier to use an orderable part number and a component list instead of relying on that shorthand.
What is an air spring bag in a product listing?
An air spring uses a flexible bellows containing pressurized air. Depending on its construction, the orderable unit may include bead plates, a piston, a bumper, studs, or fittings. Firestone's official component guide separates the bellows number from the assembly order number and identifies items such as bead plate, bellows and piston. The practical lesson is that a molded bellows identifier alone may not define the complete orderable part.
For a MAKEXCAR Air Spring Bags listing, verify the exact SKU and its supplied parts. Do not infer a piston, top plate, air-line fitting, seal or bracket from a category label or an illustrative photograph. Request front, side and connection views plus a package-content statement. If a listing shows a bare air spring without a damper, it cannot automatically replace a complete strut. Conversely, the fact that a vehicle has a separate shock does not prove that every air spring in a category fits it.
Ask for mounting dimensions and interface details: top and bottom arrangement, stud or bolt pattern, overall installed envelope, air-port style and location, and any relevant bump-stop or height range information supported by a drawing. These details are part-specific. Do not copy values from a similar-looking bellows or another manufacturer's catalog. Pressure and load ratings require their own tested conditions and are not stated here for MAKEXCAR items.
What makes a complete air strut different?
A complete strut is a combined unit in which the damper function and spring are packaged together. A given application may also incorporate a top mount, bearing, electrical control connection or other hardware. Arnott defines a suspension strut assembly as combining the primary damper and spring functions. Its own air-suspension overview distinguishes systems with integrated air struts from those with separate air springs and shock absorbers. This supports the general comparison, not an assumption about any MAKEXCAR SKU.
Because the damper is inside the quoted scope, a complete strut may involve additional interfaces and controls. A buyer must check damping type, upper and lower mounting, any electrical connector, air connection and the vehicle's control system. Those checks do not mean every complete air strut has electronic damping. A generic picture may include a wire for illustration while the target vehicle has no such feature, or vice versa.
The procurement question is “which assembly is this?” rather than “which is better?” Replacing only an air spring when the damper is the failed component will not address that damper. Ordering an integrated assembly for a vehicle designed with separate components may be impossible or inappropriate. The correct repair scope comes from diagnosis, application and the available approved part references.
How to compare two quotations with different names
Request an exploded view or package-content list for each offered part. Have the seller mark which items are supplied, transferred from the vehicle, or excluded. Identify the air spring bellows, top and bottom closures, piston, damper body, top mount, dust protection, bump stop, air-line connection, valve, sensor or electrical connector where relevant. Do not treat every row as mandatory; the checklist exposes differences that matter for the exact vehicle.
Compare each quote against the same OE reference and service position. A lower price for a bag-only item and a higher price for a complete strut are not directly comparable if they cover different components. Ask whether the labor plan assumes transferring hardware and whether the existing damper is reusable. A purchasing comparison should show delivered scope, not just unit price. The buyer should also confirm which seals or fittings must be replaced according to the vehicle procedure.
| Scope question | Air spring or bag-only quote | Complete air strut quote |
|---|---|---|
| Spring function | Confirm orderable bellows/air spring assembly content | Confirm integrated spring unit content |
| Damper function | Usually outside the bag-only scope; verify actual SKU | Part of the strut assembly definition |
| Mounting hardware | Check plates, piston, studs, fittings and seals | Check mount, fasteners, seals and exclusions |
| Connections | Confirm air-port interface and supplied fitting | Confirm air and any applicable control connection |
| Application proof | Require exact OE, axle, side and drawing | Require exact OE, axle, side and drawing |
This table is a question framework, not a claim that all bag-only products exclude every item or that all struts include the same accessories. Record the supplier's answer against the specific SKU and drawing revision. If the quotation uses “air bag,” “air spring,” “air shock” and “air strut” interchangeably, ask it to be corrected before approval.
Check fit beyond the product name
The vehicle application is the first filter, followed by interfaces. For an air spring, check the mounting points, bellows and piston arrangement, connection style and physical envelope. For a complete strut, add the damper mounts, control connection if present, and the exact assembly length or travel data required by the application. A photo of a black flexible bag rarely reveals the differences that decide fit.
Firestone's official aftermarket catalog emphasizes the assembly order number for replacement identification and warns not to confuse it with a bead-plate marking. This is another reason to capture the exact orderable reference. Cross-reference claims should be verified against the physical configuration and documentation. If a part number has superseded another, request the manufacturer's application note and the changed-component details.
Where the vehicle's original strut can be serviced with a separate air spring, confirm that the repair procedure actually supports replacing that element alone. A technically removable part is not necessarily sold or approved as a field-service item for every application. Review seals, fasteners and any calibration or height-setting procedure with the vehicle service information. This article intentionally provides no installation sequence or pressure value.
Evidence to request before a sample order
Ask for the exact product title, SKU, OE cross reference, intended vehicle and position, package-content list, drawing, connection details and photographs of the actual supply scope. If a supplier claims compatibility with an integrated strut application, ask what is being replaced and what must be reused. A statement that the “bag fits” is too broad if the original unit includes a damper or specialized mount.
For sample approval, compare the received item with the approved reference and the purchase-order wording. Photograph all included components before they are unpacked or transferred. Record fit questions and discrepancies in a controlled list. If a fitting or seal is missing, determine whether it was excluded by the quote or omitted from the shipment. Those are different issues and may require different remedies.
For a service return, record the reported symptom and diagnosis separately. A vehicle leaning at one corner can indicate an air leak, but the air spring is not the only possible leak location in a pneumatic system. Arnott's system overview includes air lines, a compressor, valve block and reservoir. A leak complaint should identify where and how it was isolated; it should not be transformed into an unverified bag failure claim.
Questions buyers frequently ask
Does an air spring bag include a shock absorber?
Do not assume so. The term often refers to the pneumatic spring component or its orderable assembly, while a complete air strut includes a damper. Confirm the exact SKU's component list; informal names vary across catalogs.
Can a bag-only item replace a complete air strut?
Only if the specific vehicle and repair procedure support replacement of the spring portion separately, and the quoted item matches the required interfaces. A category match or similar image is not enough. The damper and mount condition must also be considered by the repair professional.
Why do bellows and assembly numbers differ?
A bellows marking can identify the flexible spring element, while an assembly number can identify the orderable configuration with its end closures or piston. Firestone documents this distinction in its own system; check the numbering convention for each supplier rather than assuming it is universal.
Write the RFQ around the actual supply scope
When reviewing MAKEXCAR Air Spring Bags, provide the vehicle and suspension details, OE reference, axle and side, the part currently installed, destination market and target quantity. State whether you seek the pneumatic spring alone or a complete integrated strut as an external comparison. Request the exact package-content list, drawing, mounting and air-port information for the offered SKU.
Use the contact page to request a part-specific quote or sample documentation. Compare like-for-like scopes before deciding. The correct order begins with a defined assembly and verified application, not a familiar product nickname.
