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There is a little debate as to whether or not to resurface rotors. Is it absolutely necessary, no. In fact, it removes metal from the rotor which can help propagate the the same problems it was cut for faster. However, can it stop things such as pulsations and some squeaks or noises, yes. Hard to advise you without being able to look at your car.
Did he give you a measurement of the pad remaining? If it is in the 3/32" area your squealers could be letting you know its time to change pads and it might have nothing to do with the rotors. Your squeak may be coming from the rear drums because they need to have the backing plate greased. Easy way to tell that is to pull the ebrake and listen (for rear drum). If you hear your noise doing that, then you know.
All in all, there are no Toyota set intervals for any brake related components. Toyota does, however, have a discard thickness of all rotors. The original thickness of front rotors from factory is 25.00mm The front discard thickness is 23.00mm. If it is beneath that thickness, then Toyota says the rotors must be replaced. Other than that Toyota says to inspect rotor surface issues (i.e. deep scoring, cracks, or pulsations). If the rotor is thick enough and is not damaged Toyota never says to cut them or not to cut them.
As for rear drums, it is the same scenario as before. Only this time you measure inner diameter because as they wear the inner diameter increases. The original factory diameter is 228.6mm. This discard point is 229.6 or over must be replaced. Again it says nothing about cutting.
If they want to cut your rotors, at least make them produce a digital micrometer and show you that they are thick enough to be cut. Rotor cutting is an accepted practice within the automotive industry. They are not trying to rip you off. The are trying to save themselves from any comebacks for noise or pulsation.
Good luck
Sean
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