Quote:
Originally Posted by davidsondude5196
Just buy new ones when you feel they are starting to wear off. When you press the break and feel them shaky or as if "they aren't gripping as before" then you should replace them. They are pretty cheap 
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Wow, this is just more auto voodoo. The pads should work and feel just fine right down to the point that metal hits metal, and then it is largely too late for the rotor.
If in doubt, jack the front of the car, put it on stands, pull both wheels and give it a look on both inside and outside on both calipers. Sometimes a caliper will hang a little and one pad will wear faster than the other. Also you should have a new set handy for two reasons. One, if they are in fact worn too thin you will have them to swap out and half the work is already done. Secondly, without knowledge of the actual thickness of a new pad you really have nothing to compare the old one to if it say is worn 50 percent. Common sense may not be common today, but do try anyway.