Upgrade Your BMW's Braking with 034Motorsport’s 2-Piece Floating Rear Brake Rotors

If you're looking to seriously enhance your BMW F8x M2, M3, or M4's braking performance, you’ve got to check out the 034Motorsport 370mm x 24mm 2-Piece Floating Rear Brake Rotor Upgrade Kit. This isn't just some generic upgrade—it's designed to fit perfectly with your factory rear calipers, so you won’t have to worry about compatibility issues.

Weighing in at about 20.6 lbs, these rotors are as light as the OEM ones but pack a punch when it comes to cooling. The rotors feature 36 directionally curved vanes that really push cool air through, helping to keep things from overheating during those spirited drives or track days. Trust me, you want that heat dissipation when you’re pushing your car hard.

The central hat is made from 6061-T6 aircraft-grade aluminum, which means it’s tough yet lightweight. The rotor rings are crafted from a special alloy that can handle the high temps you might encounter on the street or the track. No more worrying about your rotors warping or losing form when you really need them to perform.

One cool feature is the J-Slot design on the rotor face. Unlike traditional drilled rotors that can crack under pressure, these slots help clean the brake pad surface and allow for better outgassing of hot pads. Plus, they reduce noise, so you can enjoy your drive without that annoying squeal.

Now, let’s talk about the floating mount system. It uses high-strength alloy steel bobbins to allow for both radial and lateral expansion, which is essential for handling the heat generated during braking. This means your rotors can expand and contract safely without affecting performance.

Features:

• Lightweight at 20.6 lbs—same as OEM but with improved cooling and metallurgy.
• Floating bobbins allow for radial and lateral expansion—OEM only allows for radial.
• Made with aerospace-grade aluminum hats.
• CM-250 special alloy rotor rings designed for hard street and track use.
• J-slotted friction face to prevent cracking compared to OEM drilled rotors.
• OEM fitment and functionality—no surprises here.
• 36 curved vanes for effective cooling.
• Replaceable rotor rings mean you save money in the long run.
• Lower long-term maintenance costs.

What’s in the Box?

• 370x24 Left Rotor
• 370x24 Right Rotor
• Installation and break-in instruction sheets

OE Part Interchange:

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

Fitment:

• BMW M2 LCI F87 (2016-2019)
• BMW M3 F80 (2012-2015)
• BMW M3 LCI F80 (2015-2018)
• BMW M4 F82 (2013-2017)
• BMW M4 LCI F82 (2016-2019)
• BMW M4 F83 (2013-2017)
• BMW M4 LCI F83 (2016-2019)

Note: Installing these rotors is pretty straightforward, but you’ll want to set aside about 2-3 hours to get everything done right. It’s worth it when you feel the difference on the road or the track.