Dexter Axle K99-184-20 XR84 Actuator Inner Member Kit Disc with Solenoid Single/Tandem

The Dexter Axle K99-184-20 is a replacement inner member kit for the XR84 (DX8.5L) surge brake actuator, designed for use with disc brake systems on single and tandem axle trailers. This kit restores the sliding inner member assembly of the actuator — the core component responsible for converting surge force into hydraulic brake pressure during deceleration.

This disc-specific inner member includes an integrated solenoid, which enables electric override functionality. The solenoid allows the brakes to be released when the tow vehicle is placed in reverse, preventing brake lockup during backing maneuvers — a critical feature for boat trailers, RV trailers, and other marine or recreational applications.

Key Features:

• Replacement inner member for the Dexter XR84 (DX8.5L) surge actuator
• Compatible with disc brake systems on single and tandem axle trailers
• Includes integrated solenoid for electric reverse lockout override
• Rated for actuators in the 6,600 lb to 8,500 lb surge capacity range
• Designed for use with a 2-inch ball coupler
• OEM Dexter replacement part — direct-fit, no modification required
• Sold as a complete boxed kit

The K99-184-20 inner member kit is the correct service replacement for maintaining or rebuilding an XR84 actuator on disc brake trailer setups. Using genuine Dexter components ensures proper hydraulic function, coupler compatibility, and reliable braking performance.