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      10-26-2025, 10:20 PM   #1
rhop101
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Drives: BMW M235i
Join Date: Sep 2017
Location: Queens, NY

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Thoughts on bolt together 2-Piece Rotors for 340mm Brakes

Hi Everyone,

Starting R&D work for the winter maintenance and prepping for my 2nd season of track days.

Made it through my first season with EBC Yellows and BMW semi-floating stock blanks alright. Albeit with the smell of brakes and some pad transfer from time to time.

I was planning on getting a fresh set of "blank" semi-floating rotors front/rear and one of the recommended track brake pads from Ferrodo or PFC and I bought a set of bimmerworld brake coolers that mount to the tension arm.

Regarding Rotors

Recommendations from friends who have done this for a while, albeit with lighter cars. They recommended just sticking with blanks, if anything.

Still reading threads from several folks on the forum have talked about the stock brakes leaving something to be desired including the rotor cooling department mainly in the front. With several ending up going to the M Performance (370mm) or other BBK, but did anyone try using a full-on 2-piece 340mm Rotor on the front?

It turns out both ECSTuning and Paragon make them for the F2X/F3X platform.

https://www.ecstuning.com/b-ecs-part...0/014586ecskt/

https://paragonbrakes.com/2-piece-ro...mance-m-sport/

I noticed the ECS one is drilled and slotted which is not preferred in general for track work. Albeit they sell them slotted only the VW platforms for some reason. I'll have to call them and ask

Paragon specs a slotted rotor with theirs.

Both offer a replacement program or replacement rotors albeit neither beats to cost of stock rotors with an FCP warranty behind them.

Seems to me for a lightly modified track car and as an intermediate driver this seems like a decent alternative to going full BBK, but having better heat dissipation in theory than a semi-floating OE style Rotor would.

Were these not around back in the late 2010s when many folks started their track journeys with these cars or is it just such a marginal difference people ignored them?

There are very few reviews on these and I don't mind spending a bit of money to be proactive for extra braking capacity and I'd only buy a set for the front. The back rotors with the stock semi-floating blanks I imagine are adequate.
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Last edited by rhop101; 10-26-2025 at 10:36 PM..
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