Don't forget wear sensors. The old ones may be reusable if they have not yet contacted the rotor but for like $1 a sensor, I always put new ones in. Rear pads usually last about twice as long as front pads. From my experience, rotors usually last 2 sets of pads before they wear to min thickness.

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Ali Al-Chalabi

2001 CLK55
1999 Dodge Ram 2500 Cummins Diesel
2002 Harley-Davidson Fatboy
Merlin Extralight w/ Campy Record