Audi TT Rear Strut Bump Stop OE 8J0511353F for TT 8J, TTS and A3 8P | PU

Buyers searching for OE 8J0511353F are usually sourcing the rear suspension stop buffer for the Audi TT 8J generation, a sports coupe and roadster platform that shares its rear axle architecture with the Audi A3 8P. In the genuine VAG catalogue the part sits in the rear suspension group as a stop buffer, while in daily trade it is called a rear bump stop, a jounce bumper or a strut buffer. Bonpora manufactures this buffer under item number 4110108, moulded in polyurethane, sized 15 mm bore, 63.1 mm outer diameter and 134 mm free height, with two pieces required per car.

As a polyurethane bump stop factory, Bonpora supplies this reference to wholesalers, suspension kit assemblers and independent parts distributors who need dependable volume production with OEM and custom design support. The sections below summarise fitment, PR code logic, cross-reference numbers and sourcing details so purchasing teams can quote with confidence.

What Is OE 8J0511353F?

The reference 8J0 511 353 F is listed by genuine Audi and Volkswagen parts catalogues as a stop buffer for the rear axle of the TT 8J platform. Genuine dealer listings describe it under the coil spring and damper assembly group, quantity two per car, one for each rear damper, and the catalogue entry covers front-wheel-drive and quattro cars with sport suspension, excluding variants with electronically controlled ride damping. Trade suppliers such as Topran and Sachs list equivalent replacement buffers for the same application, which confirms the reference has an established aftermarket footprint.

Functionally, the buffer is a progressive end-of-travel element. It is fitted over the piston rod of each rear shock absorber, inside the spring seat area above the dust cover. When the rear axle compresses fully, over a sharp bump, a pothole edge or during hard cornering, the buffer collapses in a controlled curve and prevents the damper from bottoming out metal on metal. A cracked or collapsed buffer transmits those final impacts directly into the damper seals and rod guide, which is why worn bump stops are a frequent root cause behind premature damper failure and the hard clunk reported from the rear axle.

Position in the rear axle assembly

The TT 8J rear axle is an independent multilink design with a separate coil spring and gas damper at each wheel. The buffer sits on the damper rod, concentric with the spring, and is paired with a protective cap and dust cover above it. Genuine catalogue data for the 2012 TT rear axle list the stop buffer alongside the protective cap 1J0512135A and the upper spring seat, so buyers assembling a full rear suspension refresh normally quote buffer, dust cover and protective cap together. In the Chinese aftermarket the same reference is commonly traded as a buffer plus dust cover kit, which matches how workshops install it.

Vehicle coverage: TT 8J, TTS, TT RS and A3 8P

Catalogue data from genuine dealer listings and European aftermarket suppliers converge on the following application range. Always confirm against the OE number and the vehicle PR code before quoting, because the same TT 8J rear axle uses different buffer references for standard and sport setups.

Genuine catalogue history for this reference starts around 2004 on early A3 8P sports chassis builds, and dealer listings apply it to TT models from the 2008 model year onwards. The TT 8J production run finished in 2014, with some dealer fitment lists extending to 2015 registered vehicles, so the installed base is now firmly in the replacement cycle.

PR Codes and Suspension Variants Explained

Volkswagen Group identifies suspension setups by PR codes, and this buffer is tied to a specific set of them. European suppliers list the application under PR codes 1X0 for the TT rear axle, together with 1BA, 1BD and 1BV entries for sport chassis builds, and UB5 for the A3 8P sports chassis. The paint mark combinations on the matching coil springs, such as three violet marks with one or two yellow marks, are how the factory ties each spring and buffer pair to a specific damper setup.

Which PR codes match this buffer

For quoting purposes, the practical rule is: rear axle buffers on the TT 8J are split between standard and sport suspension references, and this F-suffix buffer serves the sport-oriented calibration. If a customer supplies a VIN, the PR codes printed on the data sticker in the service book or boot floor confirm the assignment in seconds. Distributors who quote against PR codes rather than model years alone report far fewer fitment disputes and returns.

Ride control and magnetic damping exclusions

Catalogue notes consistently exclude vehicles with electronically controlled ride damping, known as Audi magnetic ride. Those cars use a different damper package with its own hardware, including a separate cover cap for the electronically controlled damper. If an incoming enquiry mentions magnetic ride or adaptive damping, the buffer reference must be re-checked against the chassis number rather than assumed.

8J0511353F vs 1K0 and Other OE Numbers

The PQ35 platform family shares rear axle hardware across several brands, which is why buffer searches often return neighbouring references such as 1K0511353M for the Golf 5 and Octavia II. The references are catalogued separately by VAG and should not be quoted as direct substitutes without verification. The table below places the TT 8J references in context.

This split is worth repeating in quotations: the front axle of the same TT 8J uses its own buffer family under 8J0 412 303, so a rear axle enquiry answered with a front axle reference is the most common sourcing error on this platform.

Aftermarket Cross-Reference Numbers

The reference has a broad aftermarket footprint, which helps buyers match stock across brands. The following cross-references are recorded in European catalogue systems for OE 8J0511353F.

Note that catalogue geometry varies between brands: febi and SWAG list 118 mm for their buffer, while Topran lists a 95 mm variant for the wider A3 application, and Bonpora specifies 134 mm free height. These figures reflect different measurement conventions and packaging ranges rather than different applications, which is why professional buyers match on the OE number and PR code first and treat catalogue dimensions as a secondary check.

Why Polyurethane for Performance Cars

The TT 8J is a sports platform, and its buffers work harder than those on a family hatchback because sport damping and stiffer springs push more compression events into the end-of-travel zone. Bonpora moulds this buffer in polyurethane, the same material class used by the major European aftermarket brands for this application. The comparison below summarises why PU is the default choice for performance car buffers.

Polyurethane is not a universal upgrade for every car, and standard-commuting vehicles are well served by either material. For sports platforms such as the TT 8J, TTS and TT RS, where rear compression events are frequent, PU offers a service profile that better matches the duty cycle of the vehicle.

Sourcing OE 8J0511353F from Bonpora

Bonpora produces the 8J0511353F buffer under item number 4110108 in a dedicated polyurethane moulding line for suspension buffers and dust cover kits. The item is part of a broader shock absorber parts programme that covers strut mounts, bump stops, dust covers and protection caps for European and Asian platforms.

OEM and custom design support

Beyond catalogue items, Bonpora supports custom auto parts development for buyers who need their own brand on the product. Sample or drawing based development covers mould making, material hardness tuning within the PU range, and packaging customisation from printed boxes to barcode labels. Wholesale orders ship in neutral export packaging by default, so distributors can land the goods and relabel them for their own markets without conflicts.

Ordering, warranty and delivery

Standard production lead time is 15 to 30 days depending on order volume and moulding schedules, with a 1 year warranty on the item. Minimum order quantities are set per reference and mixable across the buffer range, which allows buyers to build a complete TT 8J rear axle kit, buffer plus dust cover plus protective cap, inside one container plan. Quotations typically include the OE reference, Bonpora item number, dimensions and packaging specification so the buyer can compare offers on identical data.

Installation and Replacement Tips

When to replace the rear buffers

Workshops replace TT 8J rear buffers most often during damper replacement, spring replacement or when the rear axle develops a hard clunk over sharp inputs. Visual triggers include a buffer that is flattened, torn, or missing fragments, and a dust cover that has split and allowed grit onto the damper rod. Because the buffer is compressed every time the axle reaches full travel, its condition directly affects damper life, so most professional rebuilds renew buffers and dust covers as a set while the strut is apart.

Pairing with dust covers and protective caps

Genuine catalogue data group the buffer with the protective cap 1J0512135A and the upper spring seat on this platform, and several aftermarket brands sell the reference only as a combined dust cover kit. When quoting, confirm whether the customer needs the buffer alone or the buffer plus dust cover assembly, and note that the spring paint mark combinations, violet and yellow marks in the factory system, should be matched when springs are replaced at the same time. Strut spring compressors and correct seating of the upper mount are standard safety practice during installation.

Frequently Asked Questions

How many pieces of 8J0511353F does one car need?

Two. The TT 8J rear axle carries one buffer on each rear damper, so a complete car set is two pieces. Kits sold as single pieces should be ordered twice for a full axle service.

Does this buffer fit TTS and TT RS models?

Catalogue data list the reference for TT, TTS and TT RS on the 8J platform with sport suspension and without electronically controlled ride damping. Cars with magnetic ride use a different damper package, so the reference should be verified against the VIN before quoting.

Can I use 1K0511353M instead of 8J0511353F?

No. Although both references sit on shared platform hardware, VAG catalogues them separately and their calibrations differ. Professional practice is to quote against the OE number found on the vehicle or in the VIN-based catalogue, and to treat sister references as separate items in stock planning.

What is the wholesale lead time from Bonpora?

Standard delivery is 15 to 30 days depending on volume, with neutral export packaging and OEM customisation available. Custom design projects follow a separate schedule based on mould making and sample approval.

Request a Quote for OE 8J0511353F

Bonpora supplies the 8J0511353F rear bump stop, item number 4110108, directly from the factory in China with OEM and custom design support, neutral export packaging and a 1 year warranty. Send the OE reference, required quantity and destination port to receive a quotation, and ask for the current buffer and dust cover catalogue to consolidate your next suspension order.