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Yes there are brake pad sensors which should approximate the mileage remaining before replacement becomes necessary. So the remaining oil and brake pad life should gradually decline as you accumulate mileage - the rate will depend on how you drive.
And the 30,000 mile service is an Inspection which includes a test drive and 30 or so vehicle checks.
Most of this is explained in the Warranty/Service manual which came with your car.
Tom
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