sales@bonporaparts.com
0086-10-64988621
English
The Chevrolet strut bump stop 23284102 is the front coil spring lower insulator used on the front strut assembly of the Chevrolet Malibu. Genuine GM catalogues list the reference as Front Coil Spring Lower Insulator, and the same number is carried by ACDelco as 23284102. The part sits between the bottom coil of the front spring and the spring seat on the strut, where it isolates the steel spring from the metal seat, damps the final stage of suspension compression and keeps the spring located squarely under load. Malibu owners and workshops replace this insulator when the original rubber has hardened, cracked or flattened, because a collapsed seat changes ride height, introduces noise over rough roads and accelerates wear on the spring and the strut itself. Bonpora manufactures this insulator in China as a direct-fit replacement under reference 4110205, and also supports custom polyurethane moulding for importers, distributors and workshop chains. This page sets out the specification, verified fitment, cross references and order details that professional buyers need.
The Malibu front axle uses a MacPherson strut layout. The coil spring is compressed between an upper seat in the strut mount and a lower seat formed into the strut body, and a moulded elastomer insulator is fitted at the bottom interface. That insulator performs several jobs at once. It cushions the coil so road impacts are not transferred directly into the strut housing. It grips the spring end so the coil cannot rotate or shift on its seat as the suspension cycles. It closes the gap between the spring and the seat pan, which keeps dirt and water away from the contact area. And it contributes a small, controlled amount of compliance to the early part of the compression stroke.
Two failure modes matter in service. The first is permanent compression set: over years of load and heat the elastomer loses height, the spring sits lower, and front ride height drops slightly on both sides. The second is cracking and splitting of the material, usually starting at the outer edge where the coil presses hardest. A split insulator can allow the spring to contact the metal seat directly, which produces a metallic clunk over speed bumps and, in extended use, fretting damage on the seat pan. Because the insulator is inexpensive relative to the strut and the spring, replacing it whenever the front strut assembly is dismantled is normal workshop practice.
Buyers normally begin with a dimensional and material check before comparing quotations. The reference part below is produced to original drawing tolerances and is intended as a direct-fit replacement for the applications listed under OE 23284102.
| Parameter | Value |
|---|---|
| Product Name | Strut Bump Stop |
| Genuine Catalogue Name | Front Coil Spring Lower Insulator |
| Bonpora Nos | 4110205 |
| OE / OEM Number | GM23284102 (GM and ACDelco 23284102) |
| Fitment | Chevrolet |
| Position | Front Axle, Lower Spring Seat |
| Size | 23 x Φ149.5 mm |
| Material | Polyurethane |
| Colour | Black |
| Shape / Attachment | Circular, Slip-On |
| Mounting Hardware | Not Included |
| Quantity per Vehicle | 2 (one per front strut) |
| Country of Origin | China |
| Warranty | 1 Year |
| Delivery Time | 15–30 Days |
| Packaging | Neutral Export Packaging |
| Custom Service | OEM & Custom Design Support |
The stated size 23 x Φ149.5 mm describes a shallow circular pad. The 23 mm figure is the moulded section height, which sets how far the coil is lifted off the metal seat. The 149.5 mm outer diameter is the locating diameter that has to match the spring seat pan in the strut. A pad that is close in diameter but wrong in height will change front ride height, sometimes enough to be visible side to side when only one is replaced. Confirm the outer diameter and section height against the seat pan on the vehicle, or against the parts diagram for the exact model year, before releasing a production order.
GM publishes the same reference with a nominal width near 105.4 mm and thickness near 10.3 mm on some service listings, which reflects how the pad is measured at the coil contact band rather than across the full flange. The Bonpora figure of 149.5 mm is taken across the locating flange. If a drawing is critical for your application, request the dimensioned sheet and state which reference points you are measuring between, so the two sets of numbers can be reconciled before tooling.
Spring insulators are commonly ordered by OE number rather than by vehicle description, because a single moulding often covers several model years. The genuine GM catalogue applies 23284102 to the front spring and strut assembly of the following vehicle:
| Model | Platform | Years | Notes |
|---|---|---|---|
| Chevrolet Malibu | E2XX mid-size sedan | 2016–2025 | Front axle, lower spring seat, four-cylinder and hybrid derivatives |
Because the Malibu was built in several configurations over this long production run, always match on the chassis code and the model year rather than on the nameplate alone. The Malibu XL, the longer-wheelbase version sold in several export markets, uses the same front strut architecture but should still be confirmed against its own parts diagram. Required quantity is two per vehicle. Insulators should be replaced in pairs even when only one shows visible damage, because the opposite side will have taken the same mileage and will normally be in a similar condition.
GM regularly supersedes and consolidates suspension service parts. Related references that appear in the same front spring seat group include ACDelco Professional insulators in the 45G series, whose numbering does not map one to one with the GM number. When a customer quotes a 45G or 45A number, ask for the vehicle identification number and the model year so the correct insulator can be confirmed against the catalogue rather than assumed from the code sequence.
The original insulator is a polyurethane elastomer, and that is the material Bonpora uses for reference 4110205. Polyurethane is chosen for spring seat components because it holds its shape under sustained compression far better than general-purpose rubber, resists the oil, road salt and ozone it meets in service, and can be moulded to a repeatable hardness band.
| Property | Polyurethane (Bonpora 4110205) | Conventional Rubber |
|---|---|---|
| Compression set resistance | High, retains section height over time | Moderate, tends to flatten with age |
| Oil and grease resistance | Good | Limited, swells in contact with oils |
| Abrasion resistance | High, resists coil fretting | Lower, wears at the contact band |
| Ozone and weathering | Good | Prone to surface cracking |
| Temperature range | Approximately -40 °C to +90 °C | Narrower usable band |
| Hardness consistency | Moulded to a controlled band | More batch variation |
Hardness is the parameter buyers should specify most carefully. Too soft and the pad compresses away under load, so ride height drops and the coil begins to work against the seat. Too hard and impact energy passes straight into the strut housing and the body structure. Bonpora states the hardness band on the inspection sheet for each production batch, alongside the static stiffness check and a compression set measurement, so that incoming inspection can be done against a number rather than by feel. Requests outside the standard band can be moulded to order when volumes justify a dedicated tooling run.
Bonpora supplies this insulator through a process designed for overseas trade buyers. Production follows an IATF 16949 aligned quality system, and each batch is checked for static stiffness curve, compression set, hardness, dimensional conformity and appearance before packing. Neutral export packaging is standard, so cartons carry no customer branding unless requested. Lead time is normally 15 to 30 days depending on quantity and whether the item is held in stock, and the standard warranty is one year.
For buyers who need something other than the catalogue geometry, custom polyurethane parts can be developed from a drawing, a sample or a reverse-engineered original. Typical changes include a different outer diameter for an alternative seat pan, a softer or harder durometer for a comfort or heavy-duty application, and a revised section height where a lift or lowering kit changes the installed spring position. If you are sourcing a wider range of suspension buffers, the polyurethane bump stops range covers additional seat, buffer and spring aid geometries on the same platform families.
Send the OE number together with the model year and, where available, the last eight characters of the vehicle identification number. Where the number is uncertain, supply the outer diameter, the section height and the inner locating diameter measured from the removed part. A photograph of the insulator sitting in the seat pan helps confirm orientation. Orders are quoted with the tooling situation stated clearly, so you know whether the item is an existing moulding or needs a new one.
Yes, but only by dismantling the strut assembly. The front spring is compressed against the lower seat, so the coil has to be compressed with a spring compressor and the strut mount removed before the insulator can be lifted off. Because the assembly is already apart, workshops normally renew the strut mount bearing, the dust boot and the bump stop at the same time. This is one reason insulators are usually bought as part of a front strut refresh kit rather than on their own.
Match on the model year and the chassis code first, then confirm against the GM parts diagram for that specific build. The safest route is to quote the vehicle identification number when ordering. Where the original number is not legible, measure the outer diameter of the locating flange and the section height and compare them with the specification table above. Two pads that look similar in a photograph can differ enough in height to change front ride height, so dimensional confirmation is worth the extra step.
Yes. Both sides accumulate the same mileage and the same thermal history, so the opposite insulator will normally be at a similar stage of degradation even if it has not yet split. Replacing only one side can leave a small ride height difference between left and right, which affects alignment readings and can be felt through the steering. Order quantity two per vehicle as standard.
They are separate components that both sit in the front strut assembly. The bump stop is the compressible buffer fitted on the damper rod that provides progressive resistance at the end of the compression stroke and prevents the strut from bottoming out. The spring insulator is the flat pad under the bottom coil that isolates the spring from its metal seat and locates it in position. Bonpora catalogues the 23284102 reference within the strut bump stop and spring seat product family because both are supplied from the same moulded polyurethane programme and are commonly bought together for a front suspension rebuild.
Bonpora Parts supplies the Chevrolet strut bump stop 23284102 as a direct-fit replacement insulator under reference 4110205, with neutral export packaging, a one-year warranty and a normal lead time of 15 to 30 days. Send your target quantity, the OE number and the model year, and a quotation with current lead time will be prepared. If you also need other suspension buffers for this platform family, the full auto parts catalogue lists the available geometries and materials. Custom durometer, dimension and branding requirements are handled as part of the same enquiry.
