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Discussion Starter #1
My original rotors were replace under warranty b/c they were warped after about 6k miles. The second set is now also warped after about 10k miles. And this is from just normal street riding!!
I've upgraded to Axis but thought it quite peculiar to have two sets become warped and unusable.
Anyone else have any similar issues? I haven't seen much about this.
 
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Discussion Starter #2
Re: Stock rotors warping?? (sm0kimOn)

Mine were warped after 6k miles of easy riding and the bike had never seen rain
. What style of Brembo's are you speaking of? I had the 10-spoke version that came on my 2000 748. I've got Axis rotors as well- waiting to go on.

I've read that the older "cheese" style rotors are prone to warping, but I sure didn't expect it from these. Warped rotors are of no more value than a paper weight.
 
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Re: Stock rotors warping?? (SnakeEyes)

I was looking for a set of World Supersport (snowflake) rotors and found a set of used ones from one of the guys here. I guess he warped his first set just street riding and these were replaced under warranty. He took off his second set for a set of Braketechs and I bought his 10K mile snowflakes. These were warped so bad that the bike was pogo-ing at slow stops and notably dangerous at higher speeds. We talked about the warping and he had no idea. I guess they were fine when he took them off and never abused them.
 
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Discussion Starter #4
Re: Stock rotors warping?? (sm0kimOn)

I haven't had any problem with mine...
 
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Re: Stock rotors warping?? (998R)

I warped two sets of snowflakes.

I'm running 998R rotors now, with STM buttons, and no problems
 
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Re: Stock rotors warping?? (infoage1)

I ruined the stock rotors on my 998 in 10 seconds.

One maximum effort high speed slowdown 150-60 ~omygod thats a cop on the side of the road~ event, and they now are pulsing like a poor mans ABS. Pisses me off big time. I tried sanding the built up pad crud off etc. to no avail. Do to lack of $$ I'll have to wait a while.
 
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Re: Stock rotors warping?? (infoage1)

Both of mine were the snowflakes. Seems like this isn't such an isolated case as I'd first thought. Never seen anyone posting about this problem. 10k miles from a set of rotors is very sad. Do we have something that rivals the rocker arms now??
 
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Re: Stock rotors warping?? (sm0kimOn)

My swiss cheese rotors are mildly warped, pulsating a little whenever I brake. I just haven't had the funding to get better rotors. I tried all the tricks, sanding the rotor, the pad, etc, to no avail. Mine started with about 10K on the clock.
 
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Re: Stock rotors warping?? (blueSS)

Are you guys sure they're warped? I also picked up a set of "snow-flakes" for my SS. Not sure how many mile were on them, but when I put them on they felt like they must be shaped like pretzels. I had them checked with a dial indicator and they showed good. A good cleaning, a pad swap, and a few hard stops later they were fine. I've put about 10K on them since, and they're still fine. I did modify them with those STM full floating buttons, but all that did was reduce rolling resistance. Just a thought. Rather than spending a ton of money on new rotors, maybe check them to see if they are really warped, and not just a victim of poor bed-in.
 
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Re: Stock rotors warping?? (redduck)

I put mine on a tire balancing machine and spun it around slowly- the rotor is significantly warped beyond what a piece of sandpaper will fix.
 
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Re: Stock rotors warping?? (redduck)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by redduck »</TD></TR><TR><TD CLASS="quote">Are you guys sure they're warped? </TD></TR></TABLE>

I'm not positve.

But they pulsed like hell (scary), were under warranty, and were replaced under warranty...so I never put a dial on them.

In my quest to understand the problem, I read on a BMW board where they thought they had isolated the cause to the "semi-floating" buttons on the Brembos. They thought the buttons were getting impacted unevenly with brake dust and road crap, causing the rotors to "act" warped. Makes some sense. They said cleaning the buttons on a regular basis kept the problem from recurring. I also think the above situation could cause undue drag and heat resulting a true warped rotor. Pure speculation on my part.

That said, I have no problems, after 10,000 miles, with my current set-up, noting that the 998R rotors (STM full-floating buttons) are thiner than the snowflakes (so shouldn't they warp easier?), and the 4-pad calipers probably gererate more heat then the 2-pins.



Modified by infoage1 at 11:25 AM 5/7/2005
 
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Discussion Starter #12
Re: Stock rotors warping?? (infoage1)

Hey info,

Are the 998R rotors 4.5mm?

Thanks!
 
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Re: Stock rotors warping?? (Tornado-rider)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Tornado-rider »</TD></TR><TR><TD CLASS="quote">Hey info,

Are the 998R rotors 4.5mm?

Thanks!</TD></TR></TABLE>


Yep. 4.5mm actual, with "4.0mm min" stamped on the carrier.
 
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Discussion Starter #14
Re: Stock rotors warping?? (redduck)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by redduck »</TD></TR><TR><TD CLASS="quote">Are you guys sure they're warped? </TD></TR></TABLE>

Very sure. With the wheel on a stand I used the pencil trick: put a pencil on a stand with the point on the rotor and see how it tracks as you spin the wheel. The rotor was definitely out.
 
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Re: Stock rotors warping?? (infoage1)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by infoage1 »</TD></TR><TR><TD CLASS="quote">...I read on a BMW board where they thought they had isolated the cause to the "semi-floating" buttons on the Brembos. They thought the buttons were getting impacted unevenly with brake dust and road crap, causing the rotors to "act" warped. Makes some sense. </TD></TR></TABLE>

Very much so....


Yet another reason to get full-floater buttons.
 
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Discussion Starter #16
Re: Stock rotors warping?? (sm0kimOn)

I have the same problems with my 2003 800. Been vibrating like a mofo.
Dealer says Ducati won't touch them which I think sucks, but if you've had repeated problems with the stock replacements my money could buy better.

R.
 
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Discussion Starter #17
Re: Stock rotors warping?? (sm0kimOn)

Interesting, my 748 rotors are original with 24K on 'em and no warpage, and no warpage on the old stock SS rotors on my 996 either after several years of track abuse (I swapped to Braketech iron a while back, for stopping power and feel rather than warpage reasons). Maybe it's related to pads, or front-end alignment when removing and replacing the front wheel?
 
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Discussion Starter #18
Re: Stock rotors warping?? (JeffKoch)

dam i had over 18k on my 748 rotors ..not a problem .. but i went out on the 749
for a quick one,, now the dam things are starting to make noise and some vibrations .. chit , chit , chit
 
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Re: Stock rotors warping?? (sm0kimOn)

Mark:

I've had three of the snowflake cast iron rotors on the SS bikes. 2 of them were fine to 30K miles. I thought the 3rd set on the current bike was warping (pulsing during braking from high speed). Tried sandpaper and cleaning with acetone - no go. Then tried a rotor hone and cleaning with with acetone - now they're fine. YMMV.

But there are at least 4 people I know that have warped their rotors (you can actually see it). It's a common problem, although it could also be bending of the soft aluminum carriers that the OEM's come with.
 
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Discussion Starter #20
we have a 620 guy on his 3rd set in 20,000km. not sure why. we don't get that many do it, and it's only the steel carrier ones that seem to.

if they're not in warranty and are thick enough we just get them re-ground. we do it often and it works a treat. i'd never replace rotors until they're undersize or too warped. sandpaper won't do a thing.

generally 0.15mm is enough to get them feeling bad. i checked one bike at 0.5mm once - didn't really bother the owner too much. i've seeen bikes i'd call unrideably scary that the owners apparantly haven't noticed.

one guy was as shocked that i thought there was something wrong as i was that he was still riding it happily.


Modified by brad black at 8:22 PM 5/10/2005
 
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