12-22-2019, 06:16 PM | #1 |
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Dimpled & Slotted Brembo Rotors
Just finished installing new front rotors along with Hawk HPS 5.0 pads. This is my first time using non-blank rotors, and during the bedding in process, I noticed a slight rhythmic thumping sound during hard braking. ("Dook-dook-dook-dook-dook-..." ) Is this normal due to the dimples & slots? Or did I potentially screw something up during the install? It wasn't really loud, but noticeable.
Braking performance seemed to be fine...better than the oem pads and rotors that were replaced I think, though it's hard to tell without a longer test drive and some more real world braking situations.
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01-16-2020, 08:39 AM | #3 |
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Great looking rotors. Where did you get them?
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01-16-2020, 09:55 AM | #4 |
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Thanks! I'm digging them.
Amazon Brembo 09.C398.13 Front Disc Brake Rotor
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01-17-2020, 01:54 PM | #5 |
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Test drive
Hi jh_f30,
I'm thinking about doing the very same brake upgrade but only if there is a noticeable performance improvement against OEM. Could you report back on this thread after you have had a chance to test them out properly and let us know your thoughts on performance then? That would be a great help, thanks in advance. |
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01-17-2020, 01:58 PM | #6 |
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Was it the sound of ABS kicking in? My disks make some noise but only noticeable when driving next to a barrier.
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01-17-2020, 02:43 PM | #7 | |
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01-17-2020, 03:09 PM | #8 | |
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One thing to note though, the Hawk pads do seem to dust a bit more than the stock Brembo pads I had previously. Noticeably dirtier front wheels during my last wash.
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01-17-2020, 03:11 PM | #9 | |
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01-17-2020, 03:42 PM | #10 |
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Yeah Farkie's car is a lot quieter than mine but I think mine also makes sounds on braking. Only really hear it when I'm at the track though since my car makes a lot of other noises.
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01-17-2020, 06:17 PM | #11 |
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This is a normal noise. Good discussion to read:
https://f30.bimmerpost.com/forums/sh...d.php?t=826559 In short - the air gets trapped in dimples and wants to emerge. As the rotors get hotter, the air also expands quicker and pushes back on the brake pad as the pad floats over the dimples. I am not a big fan of BMW dimpled / slotted rotors. For daily driving, plain rotors work well. AP Racing J Hook rotors are much better - the J Hook part vs dimples / slots - and of course more expensive. https://apradical.stillen.com/brake-...k-brake-rotors |
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01-17-2020, 07:14 PM | #13 | |
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01-17-2020, 07:17 PM | #14 |
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Thanks! Techinically, they're "gold". Specifically didn't go with yellow because of the association of that combo on Ferraris, and a Ferrari my car is not.
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01-17-2020, 09:30 PM | #15 |
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Drilled rotors work much better for street performance. Great bite and they shed water to maintain braking in the rain. Slotted rotors are a great design for very hot track conditions but noise is a common complaint when used as a daily driver.
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01-17-2020, 10:03 PM | #16 |
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Gold it is!
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01-19-2020, 08:20 PM | #17 |
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I use solid rotors for track. The drilled is for lookin' pretty on the street.
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01-20-2020, 05:50 AM | #18 | |
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01-20-2020, 07:19 AM | #19 |
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For whatever it's worth, I think F1 and LMP-series cars use solid rotors. GTE-class race cars I think use slotted. NASCAR drivers don't really use their brakes during a race, so that's moot.
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02-13-2020, 05:02 PM | #20 |
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Yo! Long time no see bro! Would you recommend the Hawks HPS 5.0? I just wanted a daily brake pad that is good for some spirited driving in the back roads when I do decide to push the car a bit.
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02-13-2020, 05:09 PM | #21 |
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From what I remember, the pads area more of an integral piece when it comes to stopping distance and the slotted/drilled rotors allow the brakes to work longer as the passage ways allow for more air to cool the rotors. I read this many years ago though.. not sure if the science behind that has been proven/disproven as you said LMP and F1 uses solid rotors.. who knows. haha
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02-13-2020, 05:57 PM | #22 | |
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