The invention provides a multi-disc brake for a vehicle. A knuckle supports a wheel of a vehicle. A hub is mounted for rotation on the knuckle about a rotation axis. A pair of discs are mounted for rotation with the hub and for sliding movement on the hub along the rotation axis. Each of the discs includes respective inboard and outboard engaging surfaces. Brake pad assemblies are disposed about the discs to engage the engaging surfaces. The brake pad assemblies slide along the rotation axis relative to the hub. A brake fist having a bridge portion extends outboard from the knuckle around the discs and the brake pad assemblies to an outboard wall supporting the outboard brake pad assembly against outboard movement along the rotation axis. An actuator urges the discs and the brake pad assemblies together against the outboard wall to slow rotation of the hub. A first bolt extends along a first bolt axis and a second bolt extends along a second bolt axis spaced from the first bolt axis across the outboard wall for connecting the brake fist to the knuckle. A reinforcing rib extends outwardly from and across the outboard wall to intersect both of the first bolt axis and the second bolt axis in a plane perpendicular to the discs for limiting deflection of the outboard wall.