How can you detect that a disc brake system has worn brake pads?

You answered correctly. Worn brake pads in a disc brake system can be detected by the wear marks on the brake pad, since manufacturers include these marks to show minimal allowable thickness. Additionally, if the brake pads are worn, the calipers press farther and more brake fluid moves into the braking system, resulting in a lower brake fluid level in the reservoir. However, looseness in the handbrake lever is usually linked to issues with drum brakes or cable adjustment, not with disc brake pad wear. Knowing these signs helps you identify when it’s time for maintenance and keeps your brakes functioning safely.