The clamping brake mechanism is composed of members ABC and…

The clamping brake mechanism is composed of members ABC and BDE and they are pinned to a bike frame at B.  The applied force in the cable is known and fixed at C.  Assuming that no other unknowns have been solved for previously, from the FBD of the clamping member ABC, determine the single equation of equilibrium that will allow for the normal brake force at the rim at A to be found directly without requiring the use of any other equations of equilibrium.