sales@bonporaparts.com
0086-10-64988621
English
The Audi A4 B5, chassis code 8D, was produced from 1994 to 2001 and remains a common sight on roads across Europe, the Middle East, Africa and South America. In the rear axle of this platform one small elastomer component works silently to protect the dampers and keep the ride controlled: the suspension bump stop carrying OE number 8D0512131. Bonpora supplies a direct polyurethane replacement under Bonpora No. 4110002, with dimensions of 10.2 x 51.5 x 112 mm, engineered for rear axle use on the A4 B5 saloon and Avant. This guide explains how the part works, how the VAG revision suffixes differ, and what wholesale buyers should confirm before placing an order.
A strut bump stop, also called a jounce bumper or suspension buffer, is a progressive elastomer cushion fitted around the piston rod of the rear damper, above the dust cover tube. During normal driving the bump stop stays out of the action. When the suspension compresses fully - over a deep pothole, a speed bump with a loaded trunk, or a hard landing after a dip - the buffer engages and cushions the final travel before metal components can strike each other.
Without a functional buffer, full compression sends the damper rod into its end stop. The result is a harsh jolt through the chassis, accelerated wear of the damper seal, and in the worst case a bent piston rod or a cracked spring perch. A healthy 8D0512131 bump stop absorbs that final energy stroke, protects the shock absorber parts working beside it, and keeps the rear axle compliant under load.
Bump stops age with the vehicle. Ozone, heat cycles, road salt and constant compression slowly harden the material until it cracks or crumbles. On an A4 B5 that is now twenty-five to thirty years old, the original buffers have often turned brittle or collapsed, which is why this reference appears so frequently on European aftermarket catalogues and in workshop order lists.
The 8D0 512 131 family exists in several VAG revisions, and the differences are dimensional rather than functional. Catalogue data from European aftermarket suppliers shows a clear progression:
| OE Number | Approx. Height | Known Cross References | Application Note |
|---|---|---|---|
| 8D0512131 (base) | 112 mm | Febi 18356, Meyle 100 742 0024, VAICO V10-6417, Topran 110 249, SKF VKDP 43104 T | Rear axle of the A4 B5, early VIN range |
| 8D0512131E | 127 mm | Febi 23456, Meyle 100 742 0011, VAICO V10-3377 | Reinforced version for bad-road specification |
| 8D0512131J | 134 mm | Febi 18361, SWAG 30 91 8361, Optimal F8-7598 | Later production replacement for the B5 rear axle |
| 8D0512131L | 134 mm | Febi 18363, Meyle 100 742 0004, VAICO V10-1913 | Carried over to the rear axle of the A4 B6 (8E) |
Buyers browsing the VAG catalogue should also not confuse the 8D0 prefix of the A4 B5 with the 4B0 prefix used by the rear buffers of the later Audi A6 C5 platform, for example 4B0512131B. The two parts look similar but serve different axles and different height ranges.
Fitting a 134 mm buffer where the vehicle was built for the 112 mm base part changes the effective suspension travel: the stop engages earlier, the rear axle feels firmer, and comfort drops. A buffer that is too short engages late or never, leaving the damper exposed to internal bottoming. The Bonpora 4110002 follows the base 8D0512131 geometry at 112 mm, matching the Febi 18356 catalogue dimension exactly. When in doubt, measure the removed part or send the VIN to the supplier for confirmation.
The base 8D0512131 covers the rear axle, left and right side, of the A4 B5 platform in saloon and Avant body styles:
| Model | Chassis | Production Years | Position |
|---|---|---|---|
| Audi A4 saloon | 8D2 (B5) | 1995-2000 | Rear axle, left and right |
| Audi A4 Avant | 8D5 (B5) | 1995-2001 | Rear axle, left and right |
VAG parts catalogues list the base number for vehicles up to VIN 8D-X-199 999 in many markets, including Germany, North America, Mexico, Brazil, Argentina, South Africa and the FAW-built cars for China. Later VIN ranges of the B5 moved to the taller J and L revisions. Engines on the platform range from the 1.6 and 1.8T petrol units through the 2.6 V6 to the 1.9 TDI and 2.5 TDI diesels, all sharing the same rear buffer reference. One vehicle requires two pieces.
Original equipment buffers from the mid 1990s were rubber. Modern replacement production, including the Febi 18356 and VAICO V10-6417 equivalents of this reference, has shifted to polyurethane (PU), and Bonpora manufactures 4110002 in PU for the same reasons:
| Item | Specification |
|---|---|
| Product Name | Strut Bump Stop |
| Bonpora No. | 4110002 |
| OE Reference | 8D0512131 (8D0 512 131) |
| Size | Φ10.2 x Φ51.5 x 112 mm |
| Material | Polyurethane |
| Position | Rear axle, left and right |
| Warranty | 1 year |
| Delivery Time | 15-30 days |
| Packaging | Neutral export packaging |
| Custom Service | OEM and custom design support |
| Country of Origin | China |
The clearest symptom is a hard, metallic knock from the rear axle when the car crosses a dip or carries passengers and luggage. A collapsed or missing buffer lets the suspension reach the end of its travel unchecked, and the noise passes straight into the body.
Any workshop replacing rear dampers or coil springs should inspect the buffer at the same time. Cracks, missing chunks, powder residue or a buffer compressed into a permanent squashed shape all justify replacement. Since the labour is already spent on disassembly, replacing the buffers at that moment costs almost nothing extra.
The two rear buffers age at the same rate, so replace both sides together to keep the axle behaviour symmetric. Meyle and other European suppliers state this pair recommendation directly in their catalogue data for the related references.
While the rear dampers are out, inspect the dust covers and the spring seats. A torn cover lets dirt reach the damper rod, and a worn spring seat adds rear-end clunks that mimic a failed bump stop. Replacing the full hardware set in one visit avoids a second labour charge.
Bonpora produces suspension elastomer parts and supports OEM programmes as well as custom design work. For the 8D0512131 reference, existing tooling is in place and the part ships from stock or short production runs. Buyers who need a modified height, hardness or logo for their own market can request a custom mould based on a sample or drawing - the custom parts service page describes the process from drawing review to first article approval.
Each production batch is checked for hardness, dimension and appearance before packing. The 1 year warranty covers material and manufacturing defects, and documentation for customs clearance is available on request.
Standard delivery for stock items runs 15 to 30 days including production and dispatch preparation. Goods ship in neutral export packaging without Bonpora branding, so distributors and importers can resell under their own labels.
It fits the rear axle, left and right, of the Audi A4 B5 platform (saloon 8D2 and Avant 8D5) built from 1995 to 2001, covering petrol and diesel engines from 1.6 to 2.6. Later B5 production and the B6 generation use the taller J and L revisions, so confirm the height or the VIN before ordering.
No. The suffix revisions differ in height and in the travel point where the buffer engages. Fitting a taller stop changes rear ride firmness and travel; a shorter one leaves the damper unprotected. Match the height of the part removed from the vehicle.
Bonpora works with wholesale quantities and mixed-container orders. Contact the sales team with the target quantity and destination port to receive a quotation; small trial quantities are possible for first-time buyers evaluating the product.
Sample availability depends on the reference and order history. For 4110002, ask the sales team directly; samples are normally dispatched within a few working days so buyers can check material and dimensions before committing to a volume order.
Distributors, parts stores and workshop chains looking for a stable source of Audi A4 B5 rear bump stops can send an inquiry with the OE number 8D0512131, the required quantity and the destination. Bonpora replies with pricing, packing details and the earliest shipping date, and can combine this reference with other suspension buffers, mounts and bushings in one shipment to reduce the freight cost per piece.
