Thumping sound when using brakes coming from rear?

A thumping sound when using the brakes from the rear could indicate several issues, such as worn brake pads, loose or damaged brake components, or issues with the brake rotor. It's essential to inspect the brake system, including the calipers and hardware, for any signs of wear or damage. Additionally, it could be caused by debris caught in the brake assembly. If the sound persists, it's advisable to have a professional mechanic evaluate the brakes to ensure safety.