Opening an alternate fluid path of a wellbore string

A wellbore assembly comprising:

• a wellbore string configured to be disposed within a wellbore;
• and
• a float collar coupled to a downhole end of the wellbore string, the float collar comprising,
• a housing coupled to the wellbore string and comprising a fluid outlet at a downhole end of the housing, the housing defining a fluid port extending through a wall of the housing, the housing comprising a bore configured to flow a fluid received from the wellbore string,
• a check valve disposed within the housing between the fluid port and the fluid outlet, the check valve configured to allow the fluid to flow in one direction along the bore of the float collar, and
• a sleeve coupled to the wall of the housing uphole of the check valve, the sleeve configured to move, based on pressure changes of the fluid in the float collar, with respect to the wall of the housing thereby either exposing the fluid port and opening a fluid pathway from the bore to an annulus of the wellbore, or covering the fluid port and blocking the fluid pathway.