As for the not being able to prove where and when the brakes warped, I'm fully aware that I can't prove it.
My argument is that the brakes have just been checked and were in full working order. For them to just warp out of nowhere can't be right and is quite obviously not wear and tear. I think based on that it should be covered by warranty.
Read this thread for a detailed description of what happens and why. The problem is common to many cars of many marques when used in the UK climate. I once had a Renault 5 that was particularly prone to this.
I've lost count of the number of times I've referenced this post, which is a good indication of just how common the problem is.
The only way you are going to warp the discs on a car like a standard 500, is knocking it around the Nürburgring at brake neck speed and standing on the brakes in every corner, not taking a leisurely drive back home from the dealership.
That would be true if the brakes were properly lubricated and all the parts were free to move as their designer intended.
But if a pad sticks, then modest braking pressure from normal driving can easily warp a disc; applying pressure to one side of the disc only will quickly ruin it. Also, a sticking pad can quickly overheat the brakes.
Likely scenario: car is parked in a damp environment for a couple of days or, better still, driven through water or even just washed; corrosion causes one of the pads to stick in the frame, and the next time the car is driven, the disc warps.
The bad news is that if all the dealership has done is to replace the discs and pads, without properly cleaning and lubricating the reaction frames, the new set of discs and pads won't last long before the problem reappears.
If you follow the instructions in the linked post as soon as you notice any unusual vibration on braking, there's a good chance of salvaging the existing discs and pads.
This wouldn't be so much of an issue if more folks fixed their own cars; even if you need to replace both discs and pads, the whole job can be done thoroughly, with everything properly cleaned and lubricated, in a couple of hours for about the price of a tank of fuel and the result will give you problem free braking for many tens of thousands of miles. The problem is that many folks are paying £250 a pop to the dealerships to just slip in a new set of pads & discs without cleaning or lubricating anything; premature failure is then practically guaranteed.
I've lost count of the number of posts I've seen from folks who've driven like grannies and still needed new discs & pads after as little as 10k/18months. I've also seen many cars with significantly uneven pad wear - another sure sign of sticking pads.
I routinely see at least 50k out of a set of pads.
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