Brake Master Cylinder: Description and Operation

Fig. 2 Hydraulic Actuation Unit. Cougar, Thunderbird & 1989 Continental:

The brake fluid reservoir and level indicator assembly is a translucent, plastic container that is mounted on the top of the hydraulic actuation unit. The reservoir is connected to the pump inlet port by a low pressure hose, and to the master cylinder by a sealed feed port. The FLI is connected to the ECU by a five-pin connector located at the lower right hand front corner of the tank.