End result: Threw in the towel, went with OEM-sized slotted StopTech rotors, and I'm done.
I have StopTech drilled/slotted. Ive ran mine for about a year now, purchased through Rock Auto. Very happy so far with the quality and performance. Take a while to warm up but then they hook just fine & work great with my Hawk Ceramic pads for minimal brake dust. They have held up just as expected, no signs of rust ect. I do not daily the R, so these do not get daily abuse.
Stop Tech drilled /slotted front rotors , Power Stop evolution carbon fiber/ceramic brake pads ..Raybestos solid rear rotors with Stop Tech ceramic pads (painted calipers n rotor hubs blue)
We run a Stoptech BBK on the BMW 335 car that I race in endurance races (4, 9 or 12 hour) and we run either slotted or plain rotors, but never run cross-drilled. Our rotors last longer and we don't have the cracking issues associated with cross-drilled.
I have drilled and slotted rotors on my MK7. I have never had any warping or cracking issues with them, or one any other car that I've ever had with them. Performance wise I've never noticed a difference between stock or drilled/slotted rotors except for in wet conditions. When it's wet out break feel is MUCH better with drilled/slotted rotors.
+1 for stoptech st-40s, they're slotted 328mm rotors and 4 pot calipers. Car brakes really nice. Kept the stock rears, although had to replace calipers at about 120k as they were starting to seize. If the car sits for a few days, the rust builds up (I assume in the slots) and makes noise . Goes away after about 30-40 miles. Not sure if drilled would be better. I definitely don't regret it, but modulation from the 4-pot isn't improved the way I thought it'd be. For the same price or just a tad more I could've gone with R32/GolfR/etc. front and rear, I'd probably do that if I were to do it again.
I just changed the front pads/rotors on my '04 325i to Zimmerman with the OEM Textar pads. Seem to work same as before, no complaints from me. They are dusty like people say, but I don't care too much about that.
That is not true. I have been running the StopTech BBK with 355x32 floating rotors (Z4M Coupe, 3275lbs + me) for over 2 years with 25+ track days on them and they have not warped.
I just bought new brake discs for all four corners. They are made by Zimmermann, a pretty reputable aftermarket supplier. Cost was about half of the OEM.
While I understand the need to be frugel, you're talking about the most important safety equipment on your car. IMO this is where you don't cheap out. I just bought a set of Zimmerman replacement rotors (fronts) and a set of PBR Deluxe pads for under $200. Like the old Fram advert said... 'you can pay me now, or pay me later'.
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