A brake mechanism for a pallet storage system includes a leg defining a stop surface and movable between a stop position, wherein the stop surface is disposed within a travel path of a pallet traveling along a pallet storage system, and a go position, wherein the stop surface is displaced from the travel path. A biasing mechanism having a spring force is coupled to the leg and configured to bias the leg towards the stop position such that the spring force is required to be overcome to permit the leg to move from the stop position to the go position. Pallet storage systems including at least one of such brake mechanisms are also provided.