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05-07-2020, 06:37 PM | #1 |
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Stoptech BBK odd rotor groove / uneven wear
Hi all,
Has anybody seen this before? This rotor groove is the worst (driver-side, outboard), but I have it on both front, inboard and outboard disc faces. All four brake pads have a corresponding bump on them. What would cause a groove like this???? Very confused. |
05-07-2020, 09:38 PM | #2 |
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The IMSA pad shape is DR11 for the new ST60 kits. Other pad shapes don't quite fit right so you'll either have a groove like this or you'll have a groove in the brake pad. Having a slightly smaller brake pad is normal even on the OEM kit as that's why you get that lip around the outside of a well worn stock rotor.
Which brake pads are you using? |
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05-08-2020, 07:12 PM | #3 | |
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///M3... Don't want more power, Just want it to turn sharper one step closer each time. -Ohlins TTX Raceline, PolePostions seats, Akrapovic EVO, ARC-8, 1/2 Cage, Seat Delete, Stoptech BBK, solid Subframe and diff bushing, spherical bearing on everything.
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05-14-2020, 06:47 AM | #4 | |
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Here's what this type of grooving looks like on our AP J Hooks: |
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05-14-2020, 09:54 AM | #5 | ||
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///M3... Don't want more power, Just want it to turn sharper one step closer each time. -Ohlins TTX Raceline, PolePostions seats, Akrapovic EVO, ARC-8, 1/2 Cage, Seat Delete, Stoptech BBK, solid Subframe and diff bushing, spherical bearing on everything.
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05-14-2020, 10:01 PM | #6 |
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I'm having a similar issue with my Brembos GTs.
Hope its just something to do with the brakes not being used and sitting around for a long time. Going to give it a good break-in sometime this week and see what happens.
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05-24-2020, 06:05 PM | #7 |
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Very interesting, thanks for the replies. I've talked with Stoptech and their best theory was hub flex or radial temperature gradient. Hmmmm.
I think I like your answer best. I didn't notice the groove at the track, but I checked the track pads (Hawk DTC70, COTA, one weekend) and they have a bump in the corresponding location. Brand new setup, one track weekend. Currently running Stoptech Street that came with the BBK. In other news, I like the Hawk Street 5.0 better than these but not enough to swap until they're dead. |
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05-25-2020, 01:08 AM | #8 | |
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They should be so if that's the case, it looks like your pad isn't making contact evenly against the rotor or it's moving around. Do the pads feel loose when the caliper bridge is installed? Is the grove on the other side of the rotor as well? |
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06-07-2020, 07:42 AM | #9 |
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I have that same groove with the ST40s on my E46. Hasn't caused an issue over the 60 days these rotors have been on track.
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06-08-2020, 08:57 AM | #10 |
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Same grooves on my ST60's here too. No issues
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