society > travel > means of travel > a conveyance > vehicle > cart, carriage, or wagon > parts of cart or carriage > [noun] > braces supporting body (3)
A principal brace, esp. of a carriage (brace, n.2 11); (in a system of braces) the one that takes the principal strain.
brace of a coach: one of the stout leathern straps by which the body of a carriage is suspended from the springs.
Any of a number of strong leather straps supporting the body of a coach or similar vehicle.