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Reversing Solenoid Valves

Reversing Solenoid Valves

There are two types of reversing solenoids used in the trailer industry. Solenoids are typically seen on boat trailers that have hydraulic disc brakes installed or a type of hydraulic drum brake called Uni-servo (not free backing). T This locking up or partial activation of the brakes can happen when the braking coupler is compressed either during active braking or when backing up at a launch, a yard, or your driveway.  This happens because the braking coupler cannot tell the difference between the type of compression occuring.

The reversing solenoid is wired into a five-pole trailer plug that then plugs into the tow vehicle. This fifth (typically blue or black) wire receives a signal when the tow vehicle is put into reverse and actively blocks the hydraulic fluid from entering the brake lines which will cause the trailer brakes to activate.

Blocking Solenoid (Td 11250)

Blocking Solenoid

This solenoid is named appropriately as it will “Block” the fluid from leaving the master cylinder of the coupler and entering the brake lines. The solenoid easy to install as it only needs to screw into the opening of the master cylinder and the brake lines then screws into the solenoid. This solenoid is highly effective and is used on many disc brake applications. However, if you try to back up in an uphill configuration it may cause partial activation of the surge coupler due to the compressive forces being applied between the tow vehicle and trailer prior to backing up. This could drastically impede the ability to back up the hill, and you may want to convert to the bleed solenoid listed below.

Kip Valve Solenoid (Td 11253r)

Bleed, Back Flow, or Kip Solenoid

This solenoid is named after the way it acts as well. The unit blocks the fluid, but then dumps the hydraulic fluid back into the master cylinder. To do this, the master cylinder must have a port or opening in the back to attach the back flow hose. If your unit does not have the opening, then it is possible to drill and tap an opening into the master cylinder and install the nipple. This is the solenoid that if preferred if backing uphill or going through hilly and mountainous terrain is one of your towing considerations.

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Disclaimer: All technical information and specifications contained at this site are intended to conform with industry standard engineering principals and technical information sources. 

21st May 2022 J Finley

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Champion Trailers® is the one stop trailer shop for all your trailer parts needs and we are here to help keep your trailer rolling! Champion Trailers provides parts, service, and new trailer sales our local customers in Southeast Louisiana (Slidell, Covington, Mandeville, New Orleans) and the entire Mississippi Gulf Coast.Champion Trailers carries parts for many different brands of trailers such as Loadmaster, Starline, Magic Tilt, Magic Trail, EZ Loader, Champion, Ranger, Tracker, Venture, Float On, Big Tex, Carry On, Amera Trail, Dilly, PJ Trailers, Shoreline, and many more!Champion Trailers is the leader in Southeast Louisiana and the Mississippi Gulf Coast for boat or utility trailer repair. Champion Trailers can provide yearly maintenance, modifications, and repair on most boat and utility trailers such as brake install, bunk support install, axle and suspensions, lights, electric brakes, and much more! A FREE repair estimate is part of our customer service and our goal of keeping YOUR trailer rolling..

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