brake's arn't covered under warrenty(the calipers are though), so your free to do whatever you want with the pads/rotors.
I hope i can say this clearly enough.
Nothing Can "Void" your warrenty.
Let me explain this.
Consider your powertrain warrenty. it covers Everything in your powertrain. To void it would mean, if you buy wheels, and your rear axle falls off. your warrenty is void so to speak because of the new wheels.
- Unless the dealer can Specifically prove that because you bought X wheels, that weighed --- 60lbs each without rubber. the added rotational mass exceeded the limits yada yada, your axle pops off.. Then your out of luck. But if a mount had weak welds. and that was the cause -- then your wheels have nothing to do with the failure. So in other words. Your warrenty is not Void, and the dealer must cover the damage
in your warrenty fine print, you'll find exerts saying aftermarket items pertaining to the failure of an item will not be covered.
So To answer your question without so much mumbling.
If you have a clutch and flywheel, and you break a driveline, or transmission. Unless they can specifically prove that the clutch cause the faliure, your clear..
Now, if you have added a supercharger, with strong clutch. Well, a 5000rpm drop, with drag radials, etc etc, your clutch doesn't slip - and something breaks. Then they can point at the mod's.
If your clutch ever fails due to wear or any other reason. You are out of luck.
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If it was my vehicle. I would not worry about it. I would ask for the reciepts for the 2 items though, because those manufacturer's have their own warrenties!