Ball and nut assembly

A ball and nut assembly for a brake system of a vehicle, comprising:

• (a) a nut having a threaded portion;
• (b) a screw located at least partially within the nut, wherein a threaded portion of the screw engages a threaded portion of the nut;
• (c) a spindle extending through the screw so that rotation of the spindle causes rotation of the screw;
• and
• (d) an end stop in communication with the spindle, the screw, or both, wherein a mating area is located between the end stop and the screw, the mating area includes a contact region in which the end stop contacts the screw directly or indirectly, and the contact region includes a circumferential area greater than a circumferential area of a single line contact between the end stop and the screw;
• wherein the end stop prevents tilting of the spindle relative to a longitudinal axis of the spindle;
• wherein a surface of the end stop within the mating area includes one or more arcuate portions, the surface of the end stop within the mating area is a convex surface, a surface of the screw within the mating area is a concave surface, and the surface of the screw within the mating area is arcuate.