I replaced my previous rotors with Zimmerman ones and they also had this notch so don’t worry about it as it’s normal.
I used Zimmerman rotors and ATE ceramic pads all purchased from fcpeuro.com. With stock pads I could wash the car and within two days they would be brown from brake dust. Now I can go weeks before I start to notice that there may be a little dust.
With the ceramic pads I cannot tell a difference in braking, I have almost no brake dust, and the rotors still look like new.
I used both before Zimmerman is good and cheap. Akebento are good too but hard to find and more expense. I practically used all brake pads and rotors over the 13 years I own the RRS. I would recommend using cermpads.
Zimmerman rotors and Hawk HPS pads. Rotors are not drilled or slotted. The car stops on a dime and just saved me on the highway yesterday. This was the first modification I did and I'm glad I did it.
Zimmerman makes great rotors.
Had the same dilemma a few weeks back. Went with Zimmermann drilled rotors paired with EBC red. So far I've been pleased with them.
Brakes are doing great.
I just recently did the back brakes at 37k and the fronts last weekend at 39k on my 2020 M340i. Dealer said rotors were at min thickness last June but I waited for the sensors to actually trip and even then I got 1k+ miles with a good bit of pad life left still. Went with Zimmerman rotors and OEM pads from FCP Euro and second that combo. I read too many hit or miss stories about non-OEM pads, I don’t track my car, and brake dust aside like OEM brake feel.
I have etc red and they work, but I used Zimmerman rotors and never again. Don't go cheap
Ordered zimmerman f brake discs and they were not riveted tight enough. The two-piece brake disc made a clicking noise when braking at low speed.
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