Brake discs Zimmermann or DBA

i have zimmermann rotors on the rear and they look like new after one year and no rust unlike others in bought before and since then. Will buy them again. Zimmermann is good quality.

I’ve used Zimmerman for years, including beating them to crap at the track. Never any issues.

I replaced my OEM BMW blank rotors that were done and warped for the blank Zimmermann ones a week ago, but I got them from FCP euro which they had them at a lower price. I have a slow grocery getter 328i so no need to get anything more. I also used Akebono ceramic brake pads.

Zimmerman rotors with ferrodo ds2500's work for me. Also removed the dust shield and added rs3 ducts. Lately been getting about 2 weekends or ~16 sessions before they get low, but they're solid and wear predictably. Plus fcpeuro sells them.

What I've discovered is that the design of the OEM rotors are BMW 2-piece brake rotors with iron friction ring with a lightweight aluminum rotor hat. This design , to me, has flaws and is prone to excessive heat and warps rather quickly. I've had the same problem repeatedly. I switched to Zimmerman one-piece cast iron rotors with OEM pads, and I've driven very hard, and it hasn't happened ever again.

I went with Zimmermann discs for their cost and have had no issues with them.

I've recently installed the DBA Street Series - T2 Slotted. Very happy with them so far, early days, but DBA does have a good rep. Priced well too.

I've tried 3 brands of rotors just in one year of ownership in my e46. Do Zimmerman. They were my third brand I did. Other 2 warped so damn fast

I just bought zimmerman cross-drilled rotors for the fronts. Cross-drilled rotors are lighter but do not dissipate heat better (less material to soak up heat). Stock or slotted rotors are best for soaking up heat.

Oh when I got high carbon DBA rotors with PMU pads the screeching was unbearable for street driving, track was fine with all the hard braking, but light breaking around town…..screeeeeeech.