A braking system for a lift truck performs all service braking using truck
traction drive motors. Mechanical, spring applied, electrically released
brakes are coupled to wheels on opposite sides of the truck with the
mechanical brakes applying unequal braking forces to the wheels. The
mechanical brakes perform park braking and, in the event an electrical
system problem arises, backup braking as well that can be modulated by an
operator of the truck regardless of the operating condition of the truck.