None that I'm aware of @Stargate Sentinel .
I'm fairly certain, that all brake pads have a wire sensor, that are within the actual brake pad itself.
As the brake pad wears down to the point where it's low on pad material & needs to be changed, the wire sensor becomes exposed & makes physical contact with the rotor, which creates a very high-pitched, squeaking/squealing sound when you apply the brakes.
So, if you hit your brakes and hear a very high-pitched squeaking/squealing sound, that's a very good indicator, that it's time to have your brake pads changed.
Short of that, the only other thing you can do is, pull of your wheels & visually inspect your brake pads, to see how much material they have left on them.