A flap (100) for braking a vehicle by controlling a pressure of a flow (105) of exhaust gas from a combustion engine (300) comprises: a first arm portion (110); a second arm portion (120); and a support portion (130). The support portion (130) is arranged between the first arm portion (110) and the second arm portion (120). The support portion (130) is configured to mount the flap (100) rotatable about a rotational axis (135) being tangential in a cross-sectional view of the flow (105) of exhaust gas. The first arm portion (110) and the second arm portion (120) comprise a geometry to balance a pressure acting on the first arm portion (110) with the pressure acting on the second arm portion (120) to limit a maximal torque acting on the flap (100) about the rotational axis (135).
