I replaced my pads right before they would start wearing into the sensor. As long as the dash light isnt on you can take out the old one and put it back in. They didnt come w sensor.

I dont think shims or any antisqueal, mine are fine.

Personally since i check my ride all the time i left my pad sensors out and just ziptied them to the cable. I dont have a need for them and dont want to but new ones if i wear into them. Can always be put in if you want though.

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2006 X5 4.8is Fully Loaded