Ford Strut Bump Stop 1388271 | OEM Replacement Supplier & Custom Manufacturer

The Ford strut bump stop OE 1388271 (also catalogued as 1 388 271) is the front suspension jounce bumper fitted inside the front struts of the Ford Transit built from 2006 onward. Mounted on the damper rod, this compact polyurethane component acts as the final cushion of the front suspension: when the strut reaches full compression under a heavy load or a deep pothole, the bump stop absorbs the last part of the travel before metal meets metal. Bonpora manufactures the equivalent replacement under part number 4110157 in polyurethane, with OEM and custom design support for importers, wholesalers and fleet suppliers worldwide.

Commercial vans work their suspension buffers far harder than passenger cars. A Transit spends its life carrying payloads near the limit, crossing loading docks, speed bumps and rough urban roads. Each of those events compresses the front struts toward the end of their travel. A healthy buffer protects the damper, the top mount and the body; a worn or missing one lets every deep compression arrive as a hard, unfiltered impact. That is why experienced Transit maintainers treat the bump stop as a wear part to inspect at every damper replacement, not as a lifetime component.

What the Ford 1388271 Strut Bump Stop Does

Inside the front strut of the Transit, the damper controls the spring movement through most of its stroke. The final section of travel is deliberately reserved for the bump stop. As the suspension compresses fully, the bumper is squeezed against its seat and its progressive cellular structure stiffens, slowing the motion smoothly instead of allowing a sudden stop.

Protection for expensive components

Without a working buffer, full-compression events transfer directly into the damper rod, the oil seal and the top mount. Repeated impacts are a common cause of premature strut leakage and top mount noise on high-mileage vans. A functional bump stop costs a fraction of a damper assembly and can extend the service life of the parts around it.

Comfort and load stability

A hardened, collapsed or missing buffer changes how the van behaves on potholes and uneven ground: the chassis pitches under braking, cargo shifts, and drivers report a hard knocking sound from the front axle. Restoring a fresh buffer returns the intended progression of the front suspension, which matters for delivery fleets that judge comfort and cargo safety every working day.

Technical Specifications of Bonpora 4110157

The following specifications describe the Bonpora replacement for Ford OE 1388271. Buyers who prefer to match by measurement should compare the bore, outer diameter and height with the removed part.

Aftermarket catalogues list very similar dimensions for this reference: febi bilstein 103640 is recorded at 106 mm length and 72 mm diameter, while ASMETAL 45FR1321 is recorded at 105 mm with a 27 mm bore and a 71 mm outer diameter. These small differences come from measurement points and production tolerances rather than from different parts, but buyers should always verify the removed component before ordering a full axle set.

Which Ford Models Use Bump Stop 1388271?

The OE number 1388271 and the related US-format codes 6C11-3025-BA, 6C11-3025-BB and 6C11-3025-BC belong to the front suspension of the Ford Transit generation known as the Mk7 (platform codes V347/V348, listed by FEBEST as TT9), produced from 2006 to 2014. Within this generation the buffer fits the complete front axle range of body styles.

Engine coverage in the catalogues includes the 2.2 TDCi, the 2.3 16V petrol (including LPG and CNG versions), the 2.4 TDCi in rear-wheel-drive and 4x4 configurations, and the 3.2 TDCi. Some aftermarket suppliers, including FEBEST, extend the cross-reference of this bumper to the following V363 Transit generation (2014-2018); because OE numbering on the newer generation differs in several markets, buyers should confirm fitment by VIN, by the old part number, or by comparing dimensions before shipping.

Note that this buffer is specified for the front axle only. The rear suspension of the Transit uses bump stops with other OE numbers, so a full-vehicle buffer refresh normally requires two separate part orders.

Related Ford Part Numbers and Aftermarket Cross-References

Ford issued the same jounce bumper under several service numbers during the production run. The numeric codes 1 371 343 and 1 383 524 precede 1 388 271, while 1 434 150 and 1 466 436 appear alongside it in later catalogues. In the US-format system the part is indexed under 6C11-3025-BA, 6C11-3025-BB and 6C11-3025-BC. All of these references point to the same front buffer shape and size.

Purchasers who source by cross-reference can treat the numbers above as equivalents for the Transit front buffer; catalogue data changes as brands update their ranges, so the OE number 1388271 remains the safest search key for RFQs and quotations.

Symptoms of a Worn Front Bump Stop

Polyurethane buffers age gradually, and the symptoms usually appear together rather than one by one:

• Knocking from the front axle over potholes, speed bumps or loading ramps, caused by the strut reaching the end of its travel without a cushion.
• Harsh bottoming out when loaded, especially with cargo or a crew cabin near maximum weight.
• Faster damper wear: oil film on the strut body, or a replacement damper that starts leaking far earlier than expected.
• Top mount noise, because full-compression impacts travel into the upper mounting.
• Visible damage on inspection: crumbling edges, surface cracking, permanent flattening, or a buffer that has separated from its seat.

Workshops that replace dampers in axle sets should inspect the buffers at the same time. Fitting new dampers with collapsed buffers shortens the life of the new dampers, which is why many strut service kits for the Transit combine the dust boot and the jounce bumper in one package.

Polyurethane vs Rubber for Transit Bump Stops

Replacement catalogues list this buffer in polyurethane (PU), and the material choice is one of the main quality markers for this part family.

For buyers building a range of polyurethane bump stops, the Transit 1388271 profile is a high-demand reference because it covers one of the most common light commercial vans on European roads. Bonpora produces this family in polyurethane with hardness tuned for progressive compression, matching the behaviour expected from the original part.

Installation Notes for the Transit Front Axle

The buffer is a press-on component, but a few workshop practices determine how long the replacement lasts:

• Replace buffers in pairs, one for each front strut, so both sides of the axle compress evenly.
• Inspect the dust boot at the same time; a torn boot lets grit attack the damper rod and will undo the benefit of new buffers. Boot and bumper kits are available for this application.
• Compare the removed part with the specification before fitting: bore around 27.5 mm, outer diameter around 71 mm, height around 105 mm. Catalogue values of 106 mm or a 72 mm diameter fall within normal measurement differences.
• Fit the buffer dry unless the damper manufacturer specifies otherwise; grease can soften some elastomer compounds over time.
• After strut reassembly, torque the top mount to specification and check the front axle geometry if the strut itself was removed.

OEM and Custom Manufacturing Support from Bonpora

Bonpora is a China-based manufacturer of suspension buffers and related auto parts, serving importers, parts distributors and fleet programmes. For the Ford 1388271 application the standard reference is part number 4110157, supplied in neutral export packaging ready for private-label distribution.

Beyond the catalogue part, the factory provides OEM and custom design support: production against drawings or physical samples, material hardness adjusted to the required compression curve, colour and marking options, and packing arranged to customer specification. Standard delivery time is 15 to 30 days depending on quantity, and every shipment carries a 1 year warranty. Buyers who need a bespoke profile for another vehicle line can start from the custom rubber and polyurethane parts service and receive an engineering review of their sample before tooling.

To request a quotation for Bonpora 4110157 or a custom equivalent of Ford 1388271, contact the sales team with the required quantity and destination port; samples can be arranged for axle-set testing before volume orders.

Frequently Asked Questions

Which Ford models does the 1388271 strut bump stop fit?

It fits the front axle of the Ford Transit Mk7 (V347/V348, 2006-2014) across Van, Bus, Platform/Chassis and Tourneo body styles, with 2.2 TDCi, 2.3 16V, 2.4 TDCi and 3.2 TDCi engines. Some catalogues extend the reference to the 2014-2018 V363 generation, so buyers should verify by VIN or by matching the removed part.

What are the dimensions of the Ford 1388271 bump stop?

The Bonpora replacement 4110157 measures 27.5 mm bore, 71 mm outer diameter and 105 mm height. Aftermarket catalogues list values between 105 and 106 mm height and 71 to 72 mm outer diameter; the differences come from measurement points and tolerances.

Is polyurethane a good material for a loaded Transit?

Yes. Polyurethane keeps its shape under repeated heavy compressions, resists oil and road chemicals, and stays flexible in cold weather; cellular polyurethane is the material catalogued for this buffer. It is the standard material Bonpora uses for this reference.

Can Bonpora produce custom bump stops or private-label packaging?

Yes. The factory offers OEM and custom design support, manufacturing from drawings or samples with adjustable hardness, colour and marking. Delivery takes 15 to 30 days depending on quantity, packaging is neutral export cartons by default, and the product carries a 1 year warranty.