Warped Discs - MVAgusta.net
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post #1 of 17 (permalink) Old 11-24-2009, 02:05 AM Thread Starter
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Warped Discs

Just took my 07 312 back to the dealer as i have only had it a few weeks (bought it as an ex demo with 5000 kms ) ,i thought the front brakes felt funny at low speed?? Found out the discs are warped and its going to be up to 3 months for replacement ones?

Anyone fill me in on how they could have been warped seeing it was an ex demo bike??

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post #2 of 17 (permalink) Old 11-24-2009, 02:25 AM
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do they make a very loud...binding noise when you are near stop like when coming to a stop light? I'm not talking about the brake drag that you hear when you install new pads, but a substantial metal binding noise with a slight pulsating feel at the lever?
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post #3 of 17 (permalink) Old 11-24-2009, 02:45 AM Thread Starter
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no noise just a full on" pulsating " at slow speed.
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post #4 of 17 (permalink) Old 11-24-2009, 02:58 AM
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no noise just a full on" pulsating " at slow speed.
through the brake leaver yes?
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post #5 of 17 (permalink) Old 11-24-2009, 03:13 AM Thread Starter
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through the brake leaver yes?
no it was through the whole bike , nearly put you over the bars at the lights.
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post #6 of 17 (permalink) Old 11-24-2009, 03:32 AM
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no it was through the whole bike , nearly put you over the bars at the lights.
I had warped brakes on my ducati I could only feel it through the leaver, not to sure about yours sorry..
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post #7 of 17 (permalink) Old 11-24-2009, 04:26 AM
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Anyone fill me in on how they could have been warped seeing it was an ex demo bike??
Is the dealership near a track or air strip? I have always found the fastest cars & bikes to be either rentals or demos.

A few years back when the VolvoT5 turbo came out (the one that was supposed to change your perception about Volvos) - I took one for a test drive with my wife for about 30 mins & spent 1 hour before returning it trying to neutralise the burning clutch smells, the burning rubber and oil odours that perforated every pore of the car.

Glad I didn't buy that demo!

Many many years before that, I threw away a Yahama XV750 demo at about 100 kph in a bend, it had maybe 200 klms on the clock. That was 'fixed' and sold.

I don't want to alarm you, but 5K to have warped discs it must of had a few serious test pilots! Hope I am wrong.

Sometimes you get a crappy batch of metal, happened of my cousin's new Citroen - only driven by his wife, a careful sedate school teacher & the front discs warped out at 7000 klms! Not a common problem with that model car.

I guess one can speculate all one wants, but most likely you will never know the truth conclusively. Hopefully just a poor set of discs that got through QC & you have no further problem


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post #8 of 17 (permalink) Old 11-24-2009, 06:18 AM
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Iíve found that the Brembo discs on the 1000R's & 312's can easily get out of shape simply by taking a minor knock.

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post #9 of 17 (permalink) Old 11-24-2009, 06:39 AM
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I know that I had my full floating Brembo discs check for what I though was "warpage". It was explained to me, by a very competent motorcycle mechanic, that full floating discs sometime feel as if they are warped at low speeds and light brake pressures. You can check for warpage by disassembly of the front end and putting the discs on a known flat surface and checking for variations in distance from that surface. You can also check for variations in disc thickness with a micrometer. Variations in thickness (uneven wear) will feel like warpage. You could also check for runout with a dial indicator...but on floating discs this is "iffy" at best.

What I found is this: If the problem exists only at low speeds and light pressure, then it is probably just the effect of full floating discs hanging up a bit...as they sometimes do. To verify: Go to a place where you can apply dsignificant braking pressure and vary your application of brake force. If the problem goes away at higher braking forces, then it is simply the carriage assembly for your discs...clean them with a quality brake dust spray and air at the "buttons" and then retest.

I went through some extensive mantenance and discussion with a good nechanic, only to find that this is the way full floating rotors behave.

I feel this issue much more on my Ducati Monster S4Rs than I do on my MV Agusta F4 312R.

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post #10 of 17 (permalink) Old 11-24-2009, 07:36 AM
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Also "Hot Spots" on the disc will do this...clean the discs with a "scotch brite" pad and brake cleaner. But if the tech measured run-out with a dial indicator and found the discs out of spec they are warped and must be replaced. Modern discs can bend quite easily if hit or if you install a disc lock and try to move the bike with it still there.

Normally a warped rotor is felt in the lever, not the entire bike. Sure you don't just have loose steering head bearings?

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