When Should Archi 150 Riders Replace Their Brake Pads?

While checking my Archi 150 before a weekend ride, I noticed a slight squeaking sound whenever I applied the brakes. The stopping still feels normal, but the noise made me inspect the pads more carefully. I started comparing the archi 150 brake pad price and different replacement options, but I am unsure whether the sound alone means the pads need changing. For experienced riders, what other signs should be checked, such as pad thickness, braking feel, or uneven wear, before replacing them?