Some brake pads are made with wear sensors some not. It's like a fingernail of metal positioned just right to warn you that you are low. At first they just make a scraping sound and then if ignored go to an obnoxious squeel but all the ones I've dealt with shut up while you apply the brakes??
In my opinion waiting for a sensor is too late. Check brake wear when tires are rotated as disc brakes you can get a good idea with just a look. Drums need to be removed to really see where they are.
About Rotors: I'm an old f*rt and back when you could machine/turn rotors multiple times and still have good rotors. Brand new they don't give you much extra and rarely are of legal thickness if turned at all or just from the regular use. If you turn these thinner rotors they will work and feel fine but they tend to warp with heat and you end up getting new ones anyway so do it with the brakes and don't worry about it for a while. You can check the thickness and see if they can handle being turned but I bet they are too close.
This is not a ploy to sell rotors but rather to reduce weight and reduce unsprung weight which makes a car ride and handle better. Less weight also means better fuel economy so it's not a waste to engineer it that way,
T
Tom Greenleaf - MetroWest Boston - USA
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http://www.autoacsystems.com/tomgreenleaf/
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