A wheel brake for a vehicle including a brake disc unit adapted to brake the rotation of a rotation element, which is adapted to be drivingly connected to the wheel. The brake disc unit includes a first set of discs and a second set of discs arranged in an alternating manner in an axial direction. The discs in the first disc set are adapted to be rotationally rigidly connected to the rotation element. The brake disc unit includes at least one separator element, which is adapted to keep a sufficient distance between two adjacent discs of one of the disc sets for an intermediate disc from the other disc set to rotate at least substantially freely relative to the spaced discs when the brake disc unit is in a deactivated condition.