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Master Cylinder Assembly for A-60/A-75/A-84/XR-84 Actuators

The replacement master cylinder assembly is designed for UFP hydraulic brake actuators including the UFP A-60, A-70, C-70, A-75, A-84, & A-160.  A trailer master cylinder is a hydraulic device inside the trailer brake actuator that supplies brake fluid under pressure to the trailer's brakes in proportion to an input force.  The diaphragm barrier inhibits moisture from entering the reservoir to contaminate brake fluid and corroding brake components.  Brake fluid should remain inside the master cylinder or it may corrode paint.  The reservoir cap is recessed to prevent damage.