An alpine ski binding brake (1; 1'), preferably for a folding ski, comprising: a brake housing (2; 2'), a step-on plate (3; 3'), a brake bow (4; 4') that is pivotally mounted in the step-on plate (3; 3') at the proximal end and is pivotally mounted in the brake housing (2; 2') with its central portion, a lever (5; 5') pivotally mounted in the step-on plate (3; 3') with a first end and pivotally mounted in the brake housing (2; 2') with a second end so that the step-on plate can assume a raised position and a lowered position, a spring means (7; 7') arranged to push the brake housing (2; 2') and the step-on plate (3; 3') apart, wherein either a) the lever having a protrusion formed at the other end, and the brake further comprising an angled arm pivotally mounted in the brake housing with a first leg so as to be parallel to the mounting axis of the lever but spaced from it, and a second leg being formed substantially perpendicular to the first leg, wherein the first leg of the angled arm is provided in the area of the lever protrusion with a cut-out arranged in a way that, when in use, the protrusion can pass unobstructed through the cut-out when the second leg of the angled arm is parallel to the ski plane, and in a way that the second leg of the angled arm prevents the movement of the step-on plate from the lowered position to the raised position when the second leg of the angled arm is oriented perpendicularly upwards to the ski plane, or b) the lever having a groove formed in direction of the axis of rotation of the lever, and the brake further comprising an angled arm pivotally mounted in the brake housing with a first leg so as to be parallel to the mounting axis of the lever but spaced from it, and a second leg being formed substantially perpendicular to the first leg, wherein the first leg of the angled arm is provided with a ridge along the first leg arranged in a way to engage the groove on the lever when the step-on plate is in the lowered position, thus preventing the rotation of the lever when the second leg of the angled arm is oriented perpendicularly upwards to the ski plane, and the rotation of the lever is unobstructed when the second leg of the angled arm is parallel to the ski plane. a brake housing (2; 2'), a step-on plate (3; 3'), a brake bow (4; 4') that is pivotally mounted in the step-on plate (3; 3') at the proximal end and is pivotally mounted in the brake housing (2; 2') with its central portion, a lever (5; 5') pivotally mounted in the step-on plate (3; 3') with a first end and pivotally mounted in the brake housing (2; 2') with a second end so that the step-on plate can assume a raised position and a lowered position, a spring means (7; 7') arranged to push the brake housing (2; 2') and the step-on plate (3; 3') apart, wherein either a) the lever having a protrusion formed at the other end, and the brake further comprising an angled arm pivotally mounted in the brake housing with a first leg so as to be parallel to the mounting axis of the lever but spaced from it, and a second leg being formed substantially perpendicular to the first leg, wherein the first leg of the angled arm is provided in the area of the lever protrusion with a cut-out arranged in a way that, when in use, the protrusion can pass unobstructed through the cut-out when the second leg of the angled arm is parallel to the ski plane, and in a way that the second leg of the angled arm prevents the movement of the step-on plate from the lowered position to the raised position when the second leg of the angled arm is oriented perpendicularly upwards to the ski plane, or b) the lever having a groove formed in direction of the axis of rotation of the lever, and the brake further comprising a) the lever having a protrusion formed at the other end, and the brake further comprising an angled arm pivotally mounted in the brake housing with a first leg so as to be parallel to the mounting axis of the lever but spaced from it, and a second leg being formed substantially perpendicular to the first leg, wherein the first leg of the angled arm is provided in the area of the lever protrusion with a cut-out arranged in a way that, when in use, the protrusion can pass unobstructed through the cut-out when the second leg of the angled arm is parallel to the ski plane, and in a way that the second leg of the angled arm prevents the movement of the step-on plate from the lowered position to the raised position when the second leg of the angled arm is oriented perpendicularly upwards to the ski plane, or b) the lever having a groove formed in direction of the axis of rotation of the lever, and the brake further comprising an angled arm pivotally mounted in the brake housing with a first leg so as to be parallel to the mounting axis of the lever but spaced from it, and a second leg being formed substantially perpendicular to the first leg, wherein the first leg of the angled arm is provided with a ridge along the first leg arranged in a way to engage the groove on the lever when the step-on plate is in the lowered position, thus preventing the rotation of the lever when the second leg of the angled arm is oriented perpendicularly upwards to the ski plane, and the rotation of the lever is unobstructed when the second leg of the angled arm is parallel to the ski plane.