How many sets of OEM brake pads did you guys go through before replacing the front rotors? I have about 48k miles on my car, wondering if I should replace the rotors when I change the front brakes in a month or so. I also measured the brake rotors with a caliper, they are at ~34.5mm.

 

The wear specs for the 380 mm front brake rotors are 36 mm thick new and 34 mm thick "worn out". So they are saying that 34 mm is the minimum thickness before replacement is required. That is fairly obviously a sick joke being a whopping 1 mm each side, or maybe 1.33 mm on the inside and .66 mm on the outside seeing as the insides wear about twice as fast as the outsides (coz the brake pistons bear directly on the insides but indirectly on the outsides).
Given the new thickness of 36 mm it's either massively conservative or a scam to con punters into changing the rotors way before they need replacing (easy money for the dealership), and I reckon it is both. Just look at those massive front brake rotors, at 34 mm thick they still have heaps of meat!
Also, according to JLR it's perfectly OK to fit a set of new pads before the rotor thickness gets down to 34 mm and then let those pads wear out, which in theory means the rotors will be thinner than 34 mm when that new set of pads needs replacing.
Bottom line - at 34.5 mm you have 10's of thousands of miles to go yet before the rotors really truly need replacing!

 

good info, thanks!