Today I measured the passenger side front brake pad(4.5mm) and rotor(1.143-in). I then pulled up the service history and the pads were changed in 9/13 and the rotors were resurfaced. At the time the LS had 83,966 mikes and it now has 122,680 so 38,714 miles. The excellent excerpts from a post seem to indicate that below 1mm the pads will wear through the sensor wire and based on the minimum rotor thickness the current rotors could not be “resurfaced “ again. When I purchased it the service manager said the pads were at approximately 25% in front. New rotors and pads were done on the rear & the brake fluid was completely flushed. The brakes don’t shudder so I don’t believe the rotors are warped.If I continue to brake gently since I’m really at at least 35% pad left would it be wise to replace the pads & rotors(will use OEM parts) within 5,000 miles or measure again and replace everything at 2mm pad thickness?
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You do NOT need to replace your pads OR rotors unless they fail to meet the minimum measurement criterion as specified by the LS430 engineers. Those numerical measurements are:

* If the pad lining thickness is less than 1.0mm (0.039 in), replace the pad. New OEM pads are 11.0mm (0.433in) thick.

* If the disc (aka rotor) thickness is less than 28.0mm (1.102in), replace the disc. New OEM disc is 30.0mm (1.181in) thick.

* If you measure the disc runout from 10mm inside the outer edge of the disc, and runout exceeds 0.05mm (0.0020in), first index the disc to the next lug, and re-measure. If you still obtain >=0.05mm runout, check the wheel bearing for axial play and axle hub runout. If bearing play and axle hub runout are normal, and the disc thickness is above 28.0mm, shave the disc using an on-car lathe (on-car lathes can compensate for minor faults in the hub, whereas off-car lathes cannot).