Dexter Marine Products K68-539-00 Reverse Lockout Solenoid for Disc Brake Actuators

The Dexter K68-539-00 is a reverse lockout solenoid designed for trailer disc brake actuators, enabling automatic free backing operation when reversing. Unlike drum brakes, disc brakes generate full braking power in reverse, making this solenoid essential for actuators without a built-in reverse lockout lever or switch.

Key Features:

• Flow blocking style solenoid valve for older model disc brake actuators
• 12-volt operation connects directly to tow vehicle backup light circuit
• Automatic brake lockout eliminates manual switching
• Thread size: 3/16" inverted flare (IF) x 1/8" male pipe (MP)
• Compatible with both disc and drum brake systems
• Can be wired independently or adapted to trailer wire harness with 5-flat plug

This solenoid installs at the actuator before the disc brake installation and requires only one electrical connection between the solenoid and the vehicle's backup light. When the vehicle shifts into reverse, the solenoid automatically allows the trailer to freewheel, providing convenient operation without leaving the cab. Also known as Tie Down Engineering part number 81103.