Good question! Sources vary on how often to replace your brakes, but the lowest estimates seem to be around 25,000 miles. If you're unsure, here are some warning signs you can watch out for: 

- Noisy brakes - One of the earliest symptoms of worn-down brake pads is a squealing or squeaking sound when you brake. As the pads wear down even more, this sound will turn into a metallic grinding sound, which indicates an immediate need for repair. 
- Vibration when braking - If your vehicle vibrates when you apply the brakes, it means your brakes are working unevenly and need repair. 
- Taking longer to stop - When your brakes begin to take longer than normal to stop your vehicle, it's time to get them checked or replaced. 
- Indicator light - Many vehicles have an indicator light on the dash, which can warn you when there's an issue with your brakes. 
- Visibly thin or damaged pads - You mentioned that your pads look fine, so this is probably not a concern for you. But, brake pads that are visibly damaged or thin (less than 1/4") should be replaced. 

If you're not seeing any of these warning signs, your brakes are probably fine. 

It's also worth noting that, in many places, regular mandatory vehicle inspections include brake checks. So, if you've had your vehicle inspected recently, they may have already been checked during the inspection.
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