034Motorsport 2-piece Floating Rear Brake Rotor Upgrade Kit For F8x M2/M3/M4

Precision rear brake discs for BMW F8X M2, M3 and M4

Step up your stopping power with this premium two piece floating rear brake disc set for the BMW F87 M2, F80 M3 and F82/F83 M4. Sized at 370 x 24 mm and built to mount directly to the factory rear calipers, this vented, slotted upgrade delivers cooler running, consistent bite and long-term durability for fast road and track day use.

Why enthusiasts choose this rear disc set

• Two piece construction with a 6061-T6 aluminium bell to trim unsprung mass while preserving thermal capacity
• CM-250 special alloy rings engineered to cope with repeated high-temperature cycles on road and circuit
• 72 directional curved vanes actively pull cooling air through the disc to reduce fade and improve heat rejection
• J-slot friction face helps deglaze pads, clears debris and manages pad outgassing with reduced noise compared to drilled patterns
• Floating bobbin drive allows axial and radial movement for safe expansion and contraction under heat, helping minimise vibrations and cracking
• Approximately 20.6 lb per rotor, similar to OE mass but with far superior airflow and metallurgy
• Direct fit with original calipers and pads for a straightforward installation
• Replaceable rings keep lifetime running costs lower than one piece OE discs

Our team at MJ Modifications has installed these on multiple F8X builds. Customers have been delighted with the consistent performance, clean pad engagement and confidence-inspiring braking on spirited drives and track sessions.

Fitment

• BMW F87 M2
• BMW F80 M3
• BMW F82/F83 M4
• Rear axle, vehicles using 370 x 24 mm rear discs

Specifications and materials

• Size: 370 mm diameter x 24 mm thickness
• Vented with 72 directional curved vanes
• J-slot friction pattern
• 6061-T6 aluminium centre hat
• CM-250 alloy rotor rings
• Floating bobbin hardware in high-strength alloy steel
• Left and right specific

What you receive

• 370 x 24 mm left-hand rear disc
• 370 x 24 mm right-hand rear disc
• Installation and bedding-in instructions

OE cross-reference

• 34 11 2 284 809 (Left)
• 34 11 2 284 810 (Right)

Fitting and support

Professional fitting recommended. MJ Modifications in Warwickshire can supply and install this rear brake disc upgrade. Request a quote via info@mjmodifications.co.uk.

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