The adapter doesn't fit properly for me. The brake disc is not running centrally, what should I do?

Unfortunately, we can repeatedly identify very large manufacturing tolerances in the rear axle of the BMW E46 M3. For this reason, it may happen that the adapter does not sit 100% plug & play on some vehicles, even though everything is fitted correctly.We have thoroughly examined the issue – even in our workshop with three different rear axles, all of which varied. As a result, we are currently supplying the adapter version that in practice causes the fewest returns and complaints. This is the version that works best and most reliably.If it still doesn't fit, you most likely have a rear axle with larger tolerances. In many cases, this can ideally be resolved by adjusting or compensating with bushings to ensure that the brake caliper sits properly and everything aligns correctly.

Which brake pads should be used?

The original brake pads from the brake caliper, which is required for our conversion kit, must always be used.

Can I use other brake calipers as indicated in the required components?

No, unfortunately that is not possible, the reason being that all brake calipers have different height and depth measurements. If another brake disc is installed, the brake caliper would either not fit the adapter at all or not run centrally to the brake disc. If you want to install a different brake caliper, we also have an option for you. You can have a custom-made product manufactured, check out the following link for more information:

Can I also use other discs as specified in the required components?

No, unfortunately that is not possible. The reason is simply that all brake calipers have different height and depth measurements. If a different brake disc is installed, the brake caliper would either not fit on the adapter at all or would not be centered with the brake disc. However, if you want to install a different brake caliper, we also have an option for you. You can have a custom-made product produced, have a look at the following link for more information: https://epytec.de/uk/custom-made-products/brake-technology/adapters-for-brake-systems

My brake caliper is not exactly centered over the brake disc - what should I do?

If your brake caliper is not exactly centered over the brake disc, in most cases it is not a problem. Depending on the vehicle, model year, and mileage, axle tolerances can occur – and this even in newer vehicles.The most important thing is:👉 The brake caliper must have sufficient clearance on the left and right to the brake disc so that nothing rubs or permanently touches it.Many brake calipers also have locking bolts. It may happen that:there is very little clearance on one side or the bolt lightly toucheswhile on the other side there is more playThis is generally not critical.🔧 This is how you proceed:Install brake pads:First check if the brake pads can be inserted cleanly and without resistance on both sides.If everything fits:If installation is possible without problems, you can simply gently push back the locking bolts – this usually resolves the issue.If it jams:If the brake pads cannot be installed, or only with difficulty, on one side, action is required.In this case, you can:slightly shim the adapter with suitable bushings to adjust the brake caliperor – depending on the situation – slightly mill the adapter so that the brake caliper is correctly centered again👉 The goal is always that the brake caliper is evenly aligned with the brake disc and the brake pads are seated freely and cleanly.

BMW E46 M3 Brake Caliper Adapter Rear Porsche Caliper E46 M3 328x20 Brake Disc

Name: BMW E46 M3 Brake Caliper Adapter Rear Porsche Caliper E46 M3 328x20 Brake Disc
Brand: EPYTEC
SKU: 309
Price: 158.06 GBP
Availability: InStock
Rating: 5.0 (7 reviews)

✓ 328x20 34212282303 / 34212282304 BMW E46 M3 brake discs
✓ 4-piston 986352421 / 986352422 Porsche 986
✓ rear axle

£158.06*

Prices incl. VAT plus shipping costs

7 Reviews

Available

Product number: 309

Delivery by Thursday, 13.08.2026 if you order within the next 11 Hours.

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19 Jahre Expertenwissen

Brake caliper adapter on rear axle of BMW E46 M3 for the conversion to the large E46 M3 328x20 mm brake discs, combined with the caliper of Porsche 986.

Suitable for all M3 E46 models without required modifications. The brake system can also be mounted on all other E46 models without problem. It is only necessary to convert to the M3 E46 axle stub / pin or wheel hub.

Advantages:

high deceleration
thanks to the material certificate supplied with the order, it is possible to register your purchase even for series vehicles
directly fit to the above-mentioned models and therefore can always be restored to the original state without any problems
our EPYTEC brake caliper adapters do not require any sending of your serial parts, no welding, milling or drilling

Rims: at least 16 inch.

click here for installation instructions

Required components:

brake caliper: Porsche 986 reference 986.352.421 + 996.352.422
brake disc: BMW E46 M3 328x20mm reference 34212282303 + 34212282304
Front brake pads from Porsche Boxster 986 2.7
the brake pads must be slightly chamfered at the upper edge, as they are slightly overhanging

Delivery:

2x brake caliper adapters for BMW E46 M3
high-strength mounting screws
material certificate
Stress analysis / FEM calculation for entry
vehicle document to simplify the registration
installation instructions

We provide a TÜV certificate with this adapter. This means that the TÜV inspector can easily register the adapter.

Tips, information and advice:

To improve ventilation of the brake system, we recommend removing the anchor plates/brake dust plates.
For easy mounting of the rim, we recommend purchasing two of our wheel mounting aids at the same time >>go directly to the article here<<
We cannot give you a generalised answer as to which rim size you can ride after your brake conversion. There are simply too many different wheel rims. For this reason, we have developed a template with which you can easily check whether the brake system kit fits under your rim. We have included a link to the template in the description. If your rim does not fit, you can simply use wheel spacers. >> Go directly to customised wheel spacers <<
Install the adapter with the required components and then check whether new brake lines are required, as the old ones may not be long enough or the connection may not fit, depending on the model. Due to the significantly better efficiency, we recommend switching to steel braided lines. We have developed a steel braided line configurator especially for this function, which you can use to assemble and then install them according to your requirements. Click here for the steel flex configurator >> Configure steel flex brake line <<
The handbrake cable must always be used from the installed calliper, which means that the new handbrake cable may have to be adjusted slightly. For conversions in which the original calliper is still used and the original handbrake cable can be used, you may have to route it more directly to compensate for the larger disc diameter and longer travel

Please note that our articles have been designed for racing and motorsport. Use in public road traffic usually requires an individual approval in accordance with § 21 StVZO by an officially recognised expert. Further information can be found under TÜV Süd. For the individual approval, we will provide you with an expert opinion or material certificate, if available.

Brake caliper hole spacing: 130

Hole spacing steering knuckle: 76

Manufacturer: Epytec

Mounting location: rear!

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3 May 2019 23:20

thunderice82

Serious and reliable seller! Highly recommended! AAA +++

16 June 2020 11:24

Vinicius L

J'ai mis la note de 5 étoiles car le kit proposé par epytec est meilleur que ceux que l'on trouve sur eBay.. Epytec a amélioré le concept sa cale se fixe derrière la fusée contrairement au autres que l'on trouve dans le commerce ce qui réduit le déport de l'étrier de son axe et rend le montage plus solide. Produit de tres bonne qualité. Je recommande à tous ceux qui veulent avoir du freins sur leur m3 e46. Prévoir le démontage des disques pour serrer les vis de fixation de la cale. Le montage est fait et impeccable reste plus qu'a roder les freins merci epytec.

9 January 2019 19:34

new_prince

Alles bestens, Danke!

27 August 2019 13:51

Maximilian S

Versand hat reibungslos funktioniert. Das Produkt selbst passt 1A auf den Achsschenkel und zur Bremse. Kann ich jedem weiter empfehlen der auf die Porsche Bremse umbauen möchte. Bremskraft ist enorm.

6 November 2021 19:30

jakepapas1

Very nice. Thank you

2 February 2018 13:14

042seanmac3

Prefect item as described, perfect seller AAAAAA+++++

24 September 2020 00:07

enrrabacuriosos-2

Many thanks, fast delivery 😲and good seller, many thanks. Regards Jose .

Motor	Motorcode
M3	E46\|343PS(252KW)
M3 CSL	E46\|360PS(265KW)
M3	E46\|360PS(265KW)

Motor	Motorcode
M3 3.2	E46\|343PS(252KW)
M3	E46\|343PS(252KW)

Motor	Motorcode
M	E85\|343PS(252KW)

Motor	Motorcode
M3	E46\|343PS(252KW)
M3 CSL	E46\|360PS(265KW)
M3	E46\|360PS(265KW)

Motor	Motorcode
M3 3.2	E46\|343PS(252KW)
M3	E46\|343PS(252KW)

Motor	Motorcode
M	E85\|343PS(252KW)

Brake caliper rear axle Epytec 4-piston Porsche Boxster 996352421 996 986 Cayman 2.7 Tuning brake system front axle

£479.80*

£446.21

Product number: 1213

BMW E46 M3 Brake Caliper Adapter Rear Porsche Caliper E46 M3 328x20 Brake Disc

Advantages:

Required components:

Delivery:

Tips, information and advice:

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