A surge brake actuator having a coupler housing telescopically engagable with an actuator housing is provided. The surge brake actuator incorporates an improved reverse lockout assembly that prevents movement of the coupler housing with respect to the actuator housing during reverse movement of a towing vehicle. The reverse lockout assembly is capable of moving to an operating position upon forward movement of the towing vehicle. A breakaway cam effectuates actuation of a braking system of a towed vehicle if the towing vehicle breaks away from the towed vehicle.
