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The front strut bump stop 9140067 is the compression buffer fitted on the damper rods of the Volvo 850, S70, V70 and C70, the P80-platform Volvos that carried the brand through the 1990s. Bonpora supplies the same component in micro-cellular polyurethane as number 4110121, direct from the factory in China for wholesale buyers. This guide explains what the part does, which models the reference covers and what to check before ordering.
The 850 and the S70, V70 and C70 that followed all ride on MacPherson struts at the front, and each strut carries a polyurethane buffer on its rod under the dust boot.
Under normal load the buffer does nothing: the coil spring carries the body and the damper controls the wheel. When the car meets a sharp ridge or a deep pothole heavily loaded, the front suspension can reach the end of its stroke. The 9140067 compresses progressively at that point, turning the end of the travel into a controlled deceleration instead of a hard knock through the body. It also protects the damper rod seals, which wear faster when the strut is repeatedly driven against its upper limit.
Genuine listings place the part on the upper portion of the strut, under the protective dust boot, and the genuine article is a yellow micro-cellular foam body. Bonpora records a bore of 16 mm, an outside diameter of 50 mm and a free length of 40 mm, and the narrow bore locates the buffer on the damper rod.
A worn buffer rarely announces itself on smooth roads. The usual symptoms are a hollow knock from the front over sharp compressions, a harsher ride when the car is loaded, and a crumbled or crushed buffer discovered during strut or spring work. Installing a new one requires the strut to come out, so the sensible moment is during strut mount or spring replacement.
The reference belongs to the P80 platform and follows the model family through its name changes, as the table shows.
| Model | Body styles | Catalogue years | Position |
|---|---|---|---|
| Volvo 850 | Saloon and estate | 1991-1997, US records 1993-1997 | Front, both sides |
| Volvo S70 | Saloon | 1998-2000 | Front, both sides |
| Volvo V70 I | Estate | 1998-2000, extensions to the V70 II in some catalogues | Front, both sides |
| Volvo C70 | Coupe and convertible | 1998-2004, excluding self-leveling suspension | Front, both sides |
The family runs on the Volvo five-cylinder petrol engines from 2.0 to 2.5 litres, including the turbocharged T-5, T-5R and R versions, with diesel variants on the later estates; output data for the equivalents spans roughly 126 to 300 hp. One buffer geometry serves the range, so stock can be planned against the platform rather than the engine.
Catalogues qualify the C70 application with the note excluding self-leveling suspension, and self-leveling equipment appeared across the range as an option. Buyers should confirm the front strut build against the removed part or the VIN before ordering, because qualifier rules vary by market.
This reference covers the front axle only. The genuine range lists 3516327 alongside it for the same cars as the companion stopper for the rear axle, a different part with a different geometry. The two are not interchangeable, so confirm the corner before quoting enquiries written without an axle position.
The drawing data below summarises the part as supplied from the factory.
| Item | Value |
|---|---|
| Bonpora number | 4110121 |
| OE reference | 9140067 |
| Position | Front axle, both sides, 1 per side |
| Nominal size, Bonpora data | Bore 16 x OD 50 x length 40 mm |
| Material | Micro-cellular polyurethane |
| Country of origin | China |
| Warranty | 1 year |
| Delivery | 15-30 days |
| Packaging | Neutral export packaging |
| Custom service | OEM and custom design support |
The bore slips over the damper rod, the outer diameter seats against the dust boot cap, and the free length sets the remaining travel before metal contact. Because the buffer sits under the boot on the upper portion of the strut, it is often overlooked until the strut comes apart, making it a natural add-on to front suspension orders.
European catalogues publish a height of 51 mm class for the main equivalents, and some list 67 mm for the same OE number, while Bonpora records a free length of 40 mm. The gap reflects different measuring points: a mounting cap included in the figure, a different step of a stepped body, or a revised shape. The deciding check is always the removed part measured on the bench.
Enquiries often arrive quoting an aftermarket number instead of the OE. The main equivalents are Febi Bilstein 14914, Meyle 514 642 0001, VAICO V95-0284, Bendix 043616B, Metalcaucho 40652, Magnum Technology A8V001, Original Imperium 32543, Monroe PK004, Mapco 32901, Optimal F8-5919, SWAG 55 87 0001, Maxgear 72-1164 and NK 693601. All of these point to the same front buffer, sold individually with two required per axle.
One detail of this reference surprises new buyers: Volvo catalogues file the same number under several different names.
Genuine listings for 9140067 appear as Suspension Strut Bumper, Strut Bumper, Jounce Bumper, Bumper and even Helper Spring. The names describe the same foam buffer: in the suspension travel the part behaves like a progressive supplementary spring, which is where the helper spring wording comes from.
A buyer searching for a helper spring may expect a mechanical auxiliary coil, while a buyer searching for a bumper may picture body trim. When enquiries are written against these names rather than the number, confirm the OE reference, the axle and the dimensions before quoting to avoid receiving the wrong component class.
Bonpora moulds this buffer in micro-cellular polyurethane rather than filled rubber, a choice that changes how the part behaves on the vehicle.
| Property | Polyurethane (Bonpora) | Conventional rubber |
|---|---|---|
| Compression set | Low, recovers shape after repeated hits | Higher, takes a set over time |
| Ozone and heat ageing | Strong resistance | Cracks sooner in hot climates |
| Oil and fluid contact | Good resistance | Swells and softens |
| Load consistency | Uniform batch to batch | Varies with compound |
| Unit cost | Moderate | Lower |
The 850 and its successors are heavy cars with a reputation for high mileage, and many still serve as daily transport or as touring estates. A compound with a low compression set keeps its free length stable through years of compressions, protecting the travel reserve of the strut. The full polyurethane bump stop range applies the same approach across other platforms.
A correctly sized buffer only works at the end of the stroke, so a polyurethane replacement does not change normal ride comfort. What decides the fit is the geometry: height, outside diameter and bore must match the removed part.
Buyers want a faithful replacement sourced directly from a manufacturer with OEM capability.
Bonpora moulds buffers against the published OE data and ships them from its own production line, without trading layers in between. Every enquiry is checked against the reference before dispatch, and buyers can request samples and measure them against the figures above.
For distributors with their own brands, the factory offers OEM labelling, branded boxes and private moulding. Custom design covers changes of compound hardness, free length or outer profile: send the sample or the drawing, and the tooling, minimum order and lead time are confirmed before production. Details of the programme are on the custom parts page.
Standard supply ships in neutral export packaging on a 15-30 day schedule with a one-year warranty, and pricing is quoted against order volume so that distributors can plan their season.
Send the OE number, the model year, the quantity per vehicle and the destination port to the export desk. If the number has worn away, quote the height and the outside diameter and the factory will match the drawing. Buyers building a wider programme for Volvo platforms can browse the shock absorber parts catalogue alongside this line, where buffers, mounts and related hardware are grouped for one-stop purchasing.
No. This reference covers the front axle, one buffer per side, two per vehicle. The rear of the same cars uses a companion stopper catalogued under 3516327, a different part, and the two are not interchangeable. Confirm the axle and compare the removed part before ordering.
Catalogue records tie the number to the front struts of the Volvo 850 from 1991 to 1997, the S70 and V70 I from 1998 to 2000 and the C70 coupe and convertible from 1998 to 2004, with the C70 application excluding self-leveling suspension. Some catalogues extend the estate to the V70 II; treat extended ranges as unconfirmed and verify by number and dimensions.
One per front side, two per vehicle, and the part is not handed. Workshops normally renew the pair together whenever the front struts are dismantled, because mixing a new buffer with a worn one upsets the end-of-travel behaviour.
Catalogue heights for the equivalents cluster at 51 mm with some listings at 67 mm, while Bonpora records a 40 mm free length. The figures reflect different measuring points and body shapes rather than different parts, so measure the removed buffer and compare bore, outside diameter and free length before ordering.
Bonpora manufactures and exports suspension buffers from China for wholesale buyers worldwide. Quote 9140067 or 4110121 with your quantity and destination, and the export desk will return unit pricing, packing details and the next available shipment. For the material background behind the range, the polyurethane bump stops overview is a good starting point.
