Canister vacuum no suction when brush attached Bosch

Well you either have a clog you don't know about or you aren't switching the suction to the hose. Take off where hose starts and see, if you have suction there then you know it's the hose. And if you don't have suction then it's somewhere else. Pretty simple

After checking proper suction by removing the hose, inspect the brush for potential obstructions like hair or debris. Remove the brush cover for a closer look. Additionally, run your hand along the hose to check for punctures or leaks, which can significantly reduce suction. Certain models feature adjustable brush heights for various floor types. Confirm that the brush height suits the cleaning surface, as an incorrect setting can impact suction.