How Often to Replace Brake Rotors

I need to replace my rear brake pads. A mechanic suggested I also replace my rotors because they are rusted around the edges. The rotors are in fact quite rusted, however, there is no rust on the

Ed's wondering about brake jobs--how do you know whether to replace the rotors, pads or both? Tom and Ray cover all the bases in their reply, starting with the history of brake pad materials, what's used most often in modern cars, and even make a prediction about the future of used brake rotors. 
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Highly rated auto mechanics say a variety of factors can influence when you'll need to replace the brakes, such as driving frequency and road conditions.

Not every vehicle owner knows what to look for, so how do you tell when your brake rotors worn out? Brakes are vital to the...

Adapted from Larry Carley's article in Brake & Front End