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suspect warped front discs

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I have had new discs on the front of my IS200d for approx. 5000k, about 5months, I have noticed over the last few weeks that they seem to be warped again, I have done all the relevant things, checked front sliders and pistons are free also sorted the rear sliders as they were rusted in and sliders free, I just find that after 5 months they are warped. They are brembo discs and pads as I don't put cheapos on.  I have been in touch with eurocarparts about the problem but have not heard anything yet.  Has anyone else had the same problem or any ideas.... ?

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I believe the consensus of opinion is that discs don’t warp.

I’ve never experienced warped discs on any of my cars.

The issues are usually caused by dirty hubs not cleaned prior to new discs being fit, or the job not being done properly, or faults with the wheel or tyres.

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I have fitted many discs to cars and it has been perfect for at least 5 months so none of the above can be at fault, 

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are they drilled, slotted or any other way "Cool"?... my driller disks are 100% warped and cracked. Took a single stop from ~140MPH to around 90MPH on German autobahn and they got badly warped and I can see cracks around drilled holes. Just accepted that as part of looks.. 😄 

On serious note next time I am going for C-hook, bet never for driller design

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You need to use a dial gauge to check the run-out. You need to mount the disc on a known true surface though.

That said I've never experienced warped discs, ever. I've had vibration on brake application, turned out to be pad material deposited on the disc. A couple of heavy stops from speed sorted it out.

I did have issues with a SEAT many years back where the dealer changed the discs due to wear and within a month I had pulsing and vibration on braking. Discs swapped out under warranty. All well for another month or so, then vibration. Again new discs, again same problem. Finally the dealer contacted VW/SEAT technical only to be told the hubs need to changed, if they can't be cleaned up properly. New hubs and discs fitted, no problems over final 5yrs of ownership.

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Some things to check as its unlikely that the brembo discs you have bought and fitted are warped.

1. Make sure they are genuine

2. Make sure the mating faces (disc to hub) are clean and no dirt or rust remains

3. A sticking caliper will apply heat when driving and could cause the discs to warp when stationery with brakes applied - have you actually checked the caliper piston movement

4. If theres a vibration through the steering wheel then the issue is with the front discs - if its through the seat then its the back discs

5. Check the ball joints are secure - worn ones will cause a vibration when braking and possibly slow speed

6. Check your tyre pressures and for corrosion (with tyre off) on the INNER wheel as if there it could cause a slow puncture and a vibration when pressure is low.

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hi i have the same on my wifes 250 replaced them with quality disc pads done 10k and there is a flutter , i noticed when i did her rear pads the caliper was a pita to remove i greased all the slides etc , it may be the rears arent working and putting more effort into the fronts as there was no issue when new , try looking at your rears or get your local garage to put it in the rollers and check the rear efficiancy

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7 hours ago, hondansxr said:

hi i have the same on my wifes 250 replaced them with quality disc pads done 10k and there is a flutter , i noticed when i did her rear pads the caliper was a pita to remove i greased all the slides etc , it may be the rears arent working and putting more effort into the fronts as there was no issue when new , try looking at your rears or get your local garage to put it in the rollers and check the rear efficiancy

If you look at the tutorials/guides on YouTube for replacing discs, it surprises me that the vast majority don't even mention cleaning the mating faces. This can make huge difference.

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if the mating surface ihas debry on it it will cause wobble from 1st application of the brakes not 5-10 k miles later ?

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10 hours ago, hondansxr said:

if the mating surface ihas debry on it it will cause wobble from 1st application of the brakes not 5-10 k miles later ?

Absolutely. Even when a tyre is changed small amounts of rust flake can shift at the rear of the disc.  I discovered this myself a couple of years ago after I had some work done.  I had a slight wobble with slow braking so I took the wheel and disc off, cleaned the surfaces properly and all was back to normal.

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