WARNING: This page is about a different car, the 2016 Dodge Durango. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Wire Connector & Brake Fluid Level Sensor
Courtesy of CHRYSLER GROUP, LLC
Install the sensor (3) with a new O-ring into the reservoir (1) until the locking tabs are engaged.
Install the wire connector (2) to the fluid level sensor (3).