the geometry of the top arm is such that under braking it'll pull the front up due to the braking torque reacting on the arms which'll counteract the dive that would otherwise occur.
changing the roll center (lowering the top arm) so it points down from the ball joint means that under cornering the reaction of the torque from the bottom of the wheel pulls on the top arm pulling the body upwards. it will also give more -ve camber in bump.