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11-27-2018, 09:29 AM | #155 | |
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I have a rear Bendix $45 rotor in my garage because I was curious. It's a perfectly fine replacement part and I would have no reservations about driving a car with these on them etc. On a street car for most people buying a secondhand M3, they'll only change brakes maybe once or twice on one or two axles they're so big they never get really hot on the street unless you're hooning like crazy, and even these "cheapo" rotors will probably last the 2-3 years most people hold a secondhand car. I'm glad they exist because it frees up money for people to keep the engines in better shape, brakes are easy fixes if parts dry up there are myriad options but there's only the 70k or so S65 blocks out there and that's all the supply there ever will be. Wish they were blanks instead of drilled that'd look really cool, like polished silver dinner plates but let's not pretend these rotors aren't making the car worse just because it's a "minor" change. Make enough minor changes and pretty soon you have a car that is a lot better than it was when it left the factory, but it can go the other way too, and people should be realistic about their expectations and have their eyes open. "I don't notice a difference" is non-information really. There's a difference. Humans aren't dynos I'm so stoked for $10,000 running 2008 M3 sedans with rockauto rotors on them though. COME ON DEPRECIATION TRAIN WOO WOOO i need an entire car to keep my other car running and in good shape
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11-27-2018, 02:02 PM | #156 |
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I may have heavier Potenza SO4s (well currently Sottozeros) and heavier Rock Auto rotors...but my car is smoke-free.
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11-27-2018, 02:04 PM | #157 | |
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11-27-2018, 02:06 PM | #158 |
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lol funny you mention it that's why I put all the wheel weights on the part of the wheel that's closest to the pavement. It's a PITA but you get used to removing them and putting back quickly after a while.
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12-20-2018, 01:01 PM | #159 | |
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Did you figure out that wear pattern? |
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12-20-2018, 01:24 PM | #160 | ||
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12-20-2018, 03:09 PM | #161 | ||
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12-20-2018, 03:31 PM | #162 |
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I'd think solid rotors are fine if you're not tracking the car. The floating rotor design is good for heat dissipation... high temps you'll never see on the street.
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12-21-2018, 01:23 PM | #164 |
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Floating is to prevent the friction ring cracking because it’s not allowed to expand, and keep dimensions consistent . Floating rotors don’t necessarily pump air any better than a normal vented disc unless they are designed to, most oem two piece designs don’t do a great job of leaving the inner radius clear for airflow
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07-16-2019, 03:26 AM | #165 | |
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03-09-2023, 12:23 PM | #167 |
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Advice: Don't buy M3 brake rotors from Rockauto due to terrible customer service
This is an old thread but it seems like the best place to post an experience with cheap rotors and Rockauto...
I recently was getting some dynamic friction brake rotors. They have an OE spec version that uses alloy hats and the same softer high carbon iron as the OEM rotors (our OE rotors are soft to get more bite hence the wear and lips that develop). Rockauto had what seemed like a killer deal based on the pictures that showed alloy hatted rotors BUT they were actually the all iron version that is much like the Bendix brakes. I even called DF to ask if their cheaper rotors had alloy hats and apparently got a junior tech who incorrectly said that all of their M3 rotors would be (which was wrong, the 92xxxDA rotors are alloy, the 62xxD rotors are all iron) The fronts were listed as closeout with 1 each remaining so I just bought the fronts based on the pictures to see how good they were... BIG mistake to trust Rockauto's pictures and return policy... I was aware that they were probably a cheaper iron than OE, etc but I was really more concerned about the weight than if the iron in the rotor was a high carbon version or not. The soft OE rotors are somewhat annoying for daily driver use because pads wear them out. For the street I would rather change pads than $200 rotors... The rear iron rotors weigh 30% more on these so it is a non starter. Now the real ugliness.... I setup a return and had free return labels printed based on the incorrect pictures and made the HUGE mistake of sending Rockauto an email about it to try and fix it for the next customer.... They then claimed that the rotors were the same and that the pictures they have match what I got! Worse they voided my labels and made me pay return shipping... I even showed that their pictures were wrong and they said "Oh no these are the same rotors." This is clearly a case of willfully ignoring legitimate claims in order to try and maximize profits! Received: incorrect picture (that Rockauto claims is the same as above): Return Policy that wasn't followed (note "due to our mistake"): Throughout the support emails Rockauto customer service agents were just jerks (I have other words but I will keep it clean). The notion of voiding my existing free labels and then willfully ignoring that these pictures are or different rotors was really just terrible. So I would avoid buying heavy things from Rockauto (or at least return them stating that they are blatantly wrong and NEVER contact their customer service via email) I am returning them today and then once they give the partial refund I will do a credit card dispute for the rest! But with all of that the 92xxxxDA rotors from dynamic friction would be a viable option for the right price just not the 62xxxxD rotors.. -Rich
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2008 E90 335i with 10" android screen, 7" intercooler, inlets, Dinan intake, JB4 BEF, E85 conversion, Mfactory LSD, M3 suspension, EDC shocks with custom controller. Last edited by rbryantaz; 03-09-2023 at 12:57 PM.. |
03-11-2023, 11:33 AM | #168 |
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I'm betting a Hyundai or KIA shop is worse. Finding correct parts for my Tacoma is VERY difficult let alone some Tacoma YouTube repair videos.
Last edited by egebhardt; 03-16-2023 at 09:33 AM.. |
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04-30-2023, 08:02 PM | #169 | |
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Ultimately discover card ruled in my favor on the dispute. So that covered the shipping in both directions that was rockauto's mistake. Of course rockauto still hasn't fixed the incorrect pictures in the item description. -Rich |
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05-08-2023, 02:21 PM | #170 | |
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I have re-appealed the dispute again so we will see what happens... There is nothing worse than a company that won't admit its mistakes... We will see if discovercard actually looks at the photographic evidence instead of making this a "they said, they said" or takes the side of the retailer over the consumer. Having incorrect pictures is a mistake that should constitute free returns. Rockauto continues to lose points in my book over this. -Rich
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05-31-2023, 10:19 PM | #171 |
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I have a dispute open on this and ordered an e70 blower motor anyway assuming it will resolve
I then got an email that they were cancelling my order because I have an open dispute on another order! They apparently won't do business while there is a dispute open. Crazy! Rockauto is being so petty and bad over this. They continue to act badly and disappoint. I really never post about retailer issues but this seems like something worth pointing out just how petty they are. -Rich |
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05-31-2023, 11:00 PM | #173 | |
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lol leave it to BMW guys who think a $50 OEM rotor marked up to $250 because of a BMW box is really THAT much more premium than a $30 rotor being sold for $50 wholesale |
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05-31-2023, 11:04 PM | #174 | |
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The alloy center dynamic friction rotors are a good quality product where they essentially copied the OEM rotors. The all iron ones are fine for the street but... I agree that I am not going to use all iron rotors due to the extra rotating unsprung mass. -Rich |
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06-03-2023, 03:13 AM | #175 | |
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Simply buy Zimmerman or any respectable OE replacement if you don't want OEM. |
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06-03-2023, 11:08 AM | #176 | |
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It is possible for lots of companies to make a decent rotor. My point was just that rockauto had incorrect pictures and then was petty with their return process. If they had been alloy and low quality then I would have also evaluated that and stopped using them. The "OEM only" idea gives some guarantee of quality but isn't always best. There are better pads than OEM and there are non OEM rotors that are just as good as OEM.. It just turned out that I got a lower end rotor when it was shown as a higher end alloy rotor... I posted to make sure that Boone else bought them and then had to return them. |
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