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.

How to choose the right one

• Match your brake type first. Disc brake systems require the master cylinder with the reverse (back-up) solenoid. Drum brake free-backing systems use the version without a solenoid.
• Old style vs. new style: match what is currently installed in your actuator. If you're unsure which style you have, compare your unit to the product photos or send us a picture.
• Not sure? Call us at (559) 486-0410 with your actuator model (stamped on the housing) and we'll confirm the correct part before you order.

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.