Warped rotors

[Boxer]

My ITR has now got 36,000kms on it and still the factory pads. I've never previously had dramas with the braking performance of the car in fact its damn impressive.
Lately I've been having trouble with the rotors warping, but only with the OEM pads. On a track day recently I did finally experience some fade and later that week the rotors felt warped. I had Honda look at them and they reported the discs had a slight blue tinge to them and wouldn't warrant it. So I paid for a disc skim to true them up and they were fine for a while. My next track day I dropped in some Porterfield race pads from the USA and they were fantastic albeit bloody dusty. I had no fade and the rotors were fine.
Back on the street I re-fitted the original pads which were fine as well......until I did ONE hard stop from 120kmh and the rotors immediatley warped!!

I am not happy with the performance of the rotors now and have approached Honda to look at them. They laugh when I ask for a warranty fix - am I really being unreasonable when the race pads are fine on the track and the OEM's are stuffing up on the street. And I did also pay for my first skim.

??

[dbasteve]

Originally posted by Boxer
My ITR has now got 36,000kms on it and still the factory pads. I've never previously had dramas with the braking performance of the car in fact its damn impressive.
Lately I've been having trouble with the rotors warping, but only with the OEM pads. On a track day recently I did finally experience some fade and later that week the rotors felt warped. I had Honda look at them and they reported the discs had a slight blue tinge to them and wouldn't warrant it. So I paid for a disc skim to true them up and they were fine for a while. My next track day I dropped in some Porterfield race pads from the USA and they were fantastic albeit bloody dusty. I had no fade and the rotors were fine.
Back on the street I re-fitted the original pads which were fine as well......until I did ONE hard stop from 120kmh and the rotors immediatley warped!!

I am not happy with the performance of the rotors now and have approached Honda to look at them. They laugh when I ask for a warranty fix - am I really being unreasonable when the race pads are fine on the track and the OEM's are stuffing up on the street. And I did also pay for my first skim.

??

I don't believe your discs are warping. It sounds like your pads are dumping resin on the disc surface and generating DTV ( Disc Thickness Variation) which feels like a warped disc. Have a look for a black smear on the rotor surface usually around the outer diameter of the braking surface. There is a picture of this in a thread called EBC pads and DBA rotors.

[PodgeSSS]

What can be done to prevent this, or remove this ? Is this generated by driving style ? or is it somethign to do with the pads ?

[dbasteve]

Originally posted by PodgeSSS
What can be done to prevent this, or remove this ? Is this generated by driving style ? or is it somethign to do with the pads ?

If you can see the resin deposits on your disc you can rub the area back to the iron using emery paper (Red/brown coloured 120 grit) which you can buy from the hardware for about $1.50.

Some pad materials combined with certain driving styles generate this problem. This causes a lot of confusion because the same pad doesn't always work best for everyone.

I would change pads if I were you. Bendix or Ferodo.

[Boxer]

Thanks steve,

I have had them tested, and they do show a 0.2mm deviation from centre - I can see no pad deposits on the disc either

[dbasteve]

Originally posted by Boxer
Thanks steve,

I have had them tested, and they do show a 0.2mm deviation from centre - I can see no pad deposits on the disc either

0.2mm, you have got a problem!
Generally if a true warpage problem exists it will reoccur for the life of the disc. The internal stress is released each time they reach a certain temperature they distort again.
I can't say for sure whether the stress was induced by the track work and released afterwards, but I would suspect so.