Wilwood Ultralite UUC BBK Rotors - Cracking

[Beej '86 325es]

I may try another pad. I appreciate the feedback. The HT10s are definitely hard on rotors.

However, my Massive kit originally came with Coleman rotors of some sort that are NLA. I had about track 8 days with HP+ pads, and another 10 with HT10 pads on that set of rotors!


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[1990m3]

agreed -- I switched from HT-10's to DTC70 and my rotors are lasting forever. DTC60 is my next set just to see if I can tell the difference. DTC70s work way better than the HT-10's for me

I found HT10's to be very hard on rotors. Not sure if this would promote cracking,
but they sure seemed to like a lot of heat.

DTC60 now, and I just don't think about them anymore.

fwiw,
t

[TobyB]

I found HT10's to be very hard on rotors. Not sure if this would promote cracking,
but they sure seemed to like a lot of heat.

DTC60 now, and I just don't think about them anymore.

fwiw,
t

[Beej '86 325es]

If these are 0.81" rotors with straight vanes, no wonder they can't hold up to track sessions. They are light duty street rotors. I suggest you fit a set of Hawk DTC rotors. They are very, very good. Obviously not as cheap as these $34.00 rotors but at least you won't crash your car or cut a track weekend short. ;-)

https://www.summitracing.com/int/parts/hwk-hr8003r/overview/

I actually tried a set of those in .81 thickness this year, but I had bad luck. I got 4 1/2 track days out of them before one cracked. My brakes are ducted, running Hawk HT10 pads. Granted, Indy Motor Speedway's GP track is very hard on brakes, but I was still pretty disappointed. I'm not sure what to try next. Any other good brands?


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[M-technik-3]

Palmer is rough on brakes too we found. We all know steel coming out of China is crap so that does not help.

[Digitalwave]

That's scary. Not so much the cracking, but the broken mounting tabs are bad news.

[1990m3]

add ducting too -- with the power of your motor and the weight of it as well you are putting a lot of heat into those brakes. Even with a ducted BBK from Massive I was cracking rotors with my s50 318is -- I had it working well but the rotors only lasted so long.

[Massive Lee]

If these are 0.81" rotors with straight vanes, no wonder they can't hold up to track sessions. They are light duty street rotors. I suggest you fit a set of Hawk DTC rotors. They are very, very good. Obviously not as cheap as these $34.00 rotors but at least you won't crash your car or cut a track weekend short. ;-)

https://www.summitracing.com/int/parts/hwk-hr8003r/overview/

[luckysnafu]

Are they ducted?

No, just the OEM ducts through the lower valence, but nothing ducted right to the rotors.

[e30s50dan]

Chinese steel!!

[1990m3]

Are they ducted?

[luckysnafu]

I don't necessarily have a problem with the rotor facing cracking, that's understandable for what I put them through. It's the fact the mounting points all deteriorated to the point they fell apart, that's unacceptable in my mind.

The pads for the UUC BBK are slimmer than normal pads, the calipers only accept pads up to just under 1/2 inch thick (0.48" according to Hawk). The other pads available from Hawk are 0.625" thick, but won't allow the rotor to fit between them.

I will be closely monitoring the new rotors and won't run more than 2 sets of pads on them before replacement.

[Smoove1]

You generally only get to run two sets of pads per one set of rotors if you're lucky.

[Julien]

Pads wore evenly, nothing made me question the rotors when swapping new pads in. Never had any shaking or vibration from the rotors, even under hard braking on track (Palmer Motorsports Park for most of the track days, Limerock for a couple)

I think there are 3 sets of pads on these rotors. A set of Hawk DTC-60 and 2 sets of DTC-70. Though the last set of 70s still have more than half the pad left, so they are still on the car with the new rotors.

I ask because the only other time I've seen these crack was a buddy of mine who ran 3 sets of pads on a rotor. They're cheap enough to replace every time your pads reach end of life IMHO.

[luckysnafu]

Pads wore evenly, nothing made me question the rotors when swapping new pads in. Never had any shaking or vibration from the rotors, even under hard braking on track (Palmer Motorsports Park for most of the track days, Limerock for a couple)

I think there are 3 sets of pads on these rotors. A set of Hawk DTC-60 and 2 sets of DTC-70. Though the last set of 70s still have more than half the pad left, so they are still on the car with the new rotors.