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.

Why do we offer custom paint finishes exclusively in RAL colors?

RAL color tones are clearly defined and easily understandable for all parties involved. This allows misunderstandings in color selection to be avoided and the desired color tone to be reliably assigned.Individual manufacturer colors, special color tones or freely chosen color names cannot be fully covered due to the very large variety of colors. Therefore, custom paint jobs for all offered brake calipers and brake system kits are only possible with a clear RAL color number.

Which RAL colors can we not offer for the coating of our brake calipers?

We can paint your brake calipers in almost all common RAL colors. However, an exception is RAL fluorescent colors (neon/fluorescent colors) – we cannot offer these for brake caliper painting.The reason: fluorescent colors work technically different from normal RAL colors (they require special pigments/layer structures) and are significantly more sensitive in the "brake" application area. For a consistently clean, robust surface, we therefore rely on paint structures that have proven themselves in the brake area – and fluorescent RAL is excluded here.We do not offer these RAL fluorescent colors (examples)RAL 1026 Fluorescent YellowRAL 2005 Fluorescent OrangeRAL 2007 Fluorescent Light OrangeRAL 3024 Fluorescent RedRAL 3026 Fluorescent Light RedRAL 6038 Fluorescent GreenTip: If you want a "neon look," we often find a very similar non-fluorescent RAL alternative that is visually close and much more suitable for brake calipers.

What torque should be used to tighten the sealing nipples on the brake caliper?

We recommend tightening the sealing nipples on the brake caliper with 20 Nm.Why is this important?The correct torque ensures a secure seal. A too loose fit can lead to leaks, whereas over-tightening can damage threads or components.Should a torque wrench be used?Yes, for precise and safe installation, we recommend using a torque wrench.Should anything be checked after installation?Yes, the sealing nipple should be checked for tight fit and sealing afterward.

Why does the drilling of the brake disc fixing not match the wheel hub when converting the brakes?

In brake system modifications, OE components from different vehicle models are often combined. Although all functionally relevant dimensions are coordinated, the position of the hole for the standard brake disc fixing screw may differ from the threaded hole in the wheel hub. This is design-related and not an indication of a wrong brake disc or a faulty fit—provided that the components specified in the product description are used.The fixing screw is solely used to temporarily hold the brake disc on the wheel hub with the wheel disassembled. It does not perform the centering or the force-fit fastening of the brake disc.The centering is done depending on the modification over the centering collar of the wheel hub or an included centering ring. When mounting the wheel, the brake disc is flat and force-fit clamped against the wheel hub flange together with the rim using the wheel bolts or wheel nuts.The standard fixing screw is not used in this case. Drilling or machining the brake disc or the wheel hub is neither required nor intended.

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.

Large brake system KIT rear axle BMW E46 M3 Porsche 986 4-piston caliper 328x20 brake disc - Colour brake caliper: Blank without colour

Name: Large brake system KIT rear axle BMW E46 M3 Porsche 986 4-piston caliper 328x20 brake disc - Colour brake caliper: Blank without colour
Brand: EPYTEC
SKU: 309-KIT-Blank
Price: 1248.72 GBP
Availability: OutOfStock

£1,248.72*

Prices incl. VAT plus shipping costs

Available again on 03.11.2026

Product number: 309-KIT-Blank

Lieferung ab Tuesday, 03.11.2026, bestelle jetzt um es zwischen dem 04.11.2026 und 07.11.2026 zu erhalten.

Brake caliper color

Blank without color

Red with Epytec logo

Painted in the color of your choice

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19 Jahre Expertenwissen

With our large high-performance brake kit for the BMW E46 M3, you can upgrade your rear axle to a 4-piston braking system using the Porsche 986 4-piston brake calipers and achieve ideal performance.
With this kit, you can upgrade to the following components:

- Brake calipers: Porsche 986 4-piston brake calipers
- Brake discs: 328x20 mm BMW E46 M3

With this high-performance brake kit you can install the Porsche 986 4-piston brake calipers in combination with the 328x20 mm brake discs on the BMW E46 M3.

The large brake kit is not only sporty but also suitable for everyday use. Thanks to the drilled sports brake discs in combination with our ceramic brake pads, it provides ideal performance while simultaneously reducing brake dust, temperature and wear.

Another advantage of our brake kit is that it uses the same original brake calipers and brake discs that are also fitted to production vehicles. These OE parts not only make brake replacement simple and straightforward but also facilitate TÜV approval.

With this high-performance brake kit you can get started straight away and have everything you need to upgrade your rear axle to a 4-piston braking system.

The large high-performance brake kit is suitable for the following vehicles with aluminium wheel carriers

M3 E46 models

Advantages of this braking system:

Our components, such as brake calipers and brake discs, come from production vehicles and are OE parts. This makes brake replacement simple and straightforward and facilitates TÜV approval.
The material certificate included in the scope of delivery can enable approval through an individual inspection, even for standard production vehicles.
High-performance brake pads with a longer service life than original brake pads
Extremely high braking performance, also in combination with our rear axle braking system
Direct fit for the models listed above and therefore can be easily converted back to the original configuration at any time
Our EPYTEC brake caliper adapters do not require you to send in your original parts, nor do they require any rewelding, milling or redrilling.

Note:

The kit comes with new brake calipers in an unpainted, bare metal finish as standard. For an additional charge, we can also supply the brake calipers in your preferred colour and without a logo, although the delivery time will be approximately 2-3 weeks longer.

Get our high-performance brake kit now and experience ideal performance and durability.

Suitable for all listed vehicles equipped with aluminium wheel carriers (not suitable for vehicles with steel wheel carriers)

Scope of delivery:

Porsche 986 brake calipers part no.: 986.352.421 part no.: 986.352.422 or part no.: 996.352.421 part no.: 996.352.422 in an unpainted, bare metal finish
Rear brake discs BMW E46 M3 328x20mm part no.: 34212282303 or 34212282304
Front brake pads from the Porsche Boxster 986 2.7
2x brake caliper adapters for the BMW E46 M3
2x matching braided stainless steel brake lines
Installation aid for brake disc installation
High-strength fastening bolts
Material certificate
Stress analysis / FEM calculation for approval
Installation instructions (click here)

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

FAQ: Häufige Fragen

Sollte ich die Anker- bzw. Staubbleche entfernen?

Wir empfehlen das Entfernen der Bleche, da sie die Belüftung einschränken. Ohne diese Barriere wird die Bremse effizienter gekühlt und bleibt auch bei starker Beanspruchung leistungsfähig.

Wie erleichtere ich mir die Felgenmontage?

Mit Radmontagehilfen gelingt das Ausrichten und Aufsetzen der Felge einfacher und präziser. Das schützt Gewinde und Felge und spart Zeit.

Radmontagehilfe ansehen

Benötige ich Spurverbreiterungen nach dem Umbau?

Welche Felgengröße passt, lässt sich pauschal nicht sagen. Streift die Felge minimal am Bremssattel, schaffen Spurverbreiterungen den nötigen Abstand.

Spurverbreiterungen ansehen

Brauche ich neue Bremsleitungen?

Für optimale Passform und stabile Bremswirkung empfehlen wir Stahlflex. Diese sind konfigurierbar und liefern konstantere Ergebnisse als Gummileitungen.

Stahlflex konfigurieren

Warum unsere Adapter die beste Wahl sind

Wusstest du, dass sich dein EPYTEC-Adapter oft schon nach dem ersten Verschleißteilwechsel komplett bezahlt macht?

Das liegt daran, dass du mit unseren Adaptern auf OE-Bremsscheiben und -Sättel setzt, die wir bewusst bei der Entwicklung der Adapter ausgewählt haben. Diese Komponenten sind nicht nur in höchster Qualität gefertigt und in Serienfahrzeugen im Einsatz, sondern durch ihre Großserienproduktion auch günstig und jederzeit verfügbar.

Für dich bedeutet das: erstklassige Bremsleistung ohne Abhängigkeit von teuren Speziallösungen anderer Hersteller.

Und selbst beim TÜV hast du es leichter, denn unsere OE-Komponenten sind bereits offiziell abgenommen – der Prüfer kann sich direkt darauf beziehen, sodass deine Eintragung unkompliziert und sicher abläuft.

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

Brake caliper type: Porsche 996 4 Kolben Sattel Hinterachse

Farbe Bremssattel: Blank ohne Farbe

Hole spacing steering knuckle: 76

Manufacturer: Epytec

Mounting location: rear!

Weight: 14.1 kg

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

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

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

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

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

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

£155.88*

Product number: 309