up to how many miles does infiniti warrant the brakes. Do aftermarket rims void the warranty.

 

Aftermarket rims that weigh more than oem SHOULD void the special replacement proceedure [not really a warranty] just an [add on] to please the whinners and improve G [Infiniti] image.
But dealers usually ignore wheels/tires because Nissan doesn't see the wheels.
And paid work is paid work, even if it is at a discount.

Every pound you add to rotating mass has serious future wear ramifications! Shocks, tires, wheel bearings, suspension and of course brakes!