Abstract: A mud flap mounting bracket mounts the mud flap assembly onto a truck frame. A mud flap assembly has a seat member, a face plate rotatably seated against the seat member and an arm attached to one end thereof to the face plate. A tension spring has one end connected to the arm and another end connected to a chain which is in turn attached to the seat member through a U-bolt for retaining the face plate seated against the seat member. The seat member has attached at an opposite face a bight section of a first U-shaped bracket. A second U-shaped bracket has its bight section fixably mounted to the frame of the vehicle. Each U-shaped bracket has legs extending outwardly from its bight section. The first U-shaped bracket has a rod rigidly connected to and extending between the leg portions. The leg portions of the second bracket has slots downwardly extending from the side edge of the leg portions. The rod member and slots are sized so that the rod snugly fits within the slot.