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Originally Posted by kelvinvo
so i guess i really need to replace it .my car now has 117k miles on it. still what would happen if i keep the rotors with the new pads
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I can only tell you what can happen (not what will happen): rotor cracks, breaks, and you are
! I've only heard of this happening on race cars, but the X5 is a pretty heavy vehicle and I'd want my brakes operational at all times, but that's just me.
You do not need to put new pads on when you put on new rotors, but a lot of people do since they are 'in there' anyways.
Measure your rotor thickness against the minimum spec stamped on the hat of the rotor. FWIW, my old E30 325iS in stock class club racing (way under braked, imho) used to wear about 0.001 inches of rotor for a race weekend with race compound brakes.
If they are near or below the minimum spec, change them out.