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Toyota Camry 1995: When do brake rotors need to be replaced?

A friend has a 1995 Toyota Camry with nearly 400,000 km on it and he is still on his original brake rotors. He has had to be quite firm with mechanics who have wanted to machine them. He maintains that even though they may not be completely smooth the new pads soon bed in. I can understand if there is uneven or lumpy braking then they may need it, but otherwise is it necessary?

It's almost an automatic thing these days to machine the disc rotors at the first change of pads and then replace them at the second pad change. The first skim is usually to smooth the surface so the pedal doesn't pulsate under braking, and shouldn't really affect the braking performance. The replacement of the discs is usually because they are worn out, and below the minimum thickness. Now this varies considerably from brand to brand, European brands generally have softer discs that wear faster than discs on Japanese brands like your mate's Toyota. Getting 400,000 km out of a set of discs is amazing.

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