Supplemental Braking Systems (SMI)

  • #1 in Towed Vehicle Braking

    SMI by Demco

    #1 in Towed Vehicle Braking

  • We were awarded the GOLD Motorhome Readers Choice Award 2012, 2014, 2015 and 2016!

    Motorhome RCA Winner- Voted #1 by You!

    We were awarded the GOLD Motorhome Readers Choice Award 2012, 2014, 2015 and 2016!

  • Air Force One uses a pilot signal from the coach's air brake system to deliver 100%, direct proportional braking.

    Air Force One Towed Vehicle Braking System

    Air Force One uses a pilot signal from the coach's air brake system to deliver 100%, direct proportional braking.

  • No more boxes! That is the cry of our customers. The Stay-IN-Play DUO answers the cry.

    Stay In Play Towed Vehicle Braking System

    No more boxes! That is the cry of our customers. The Stay-IN-Play DUO answers the cry.

Welcome to the SMI Braking System home page

You are in the right place! We are excited to announce that as of July 1, 2017, we are now part of the Demco family of products. We invite you to view all the braking sytems as well as our tow bar and baseplate systems. Should you have any questions, email us at sales@demco-products.com or give us a call at 800.543.3626. We are always glad to help with any question about towing your vehicle and the equipment you may need to enjoy the adventure!

Towing a vehicle behind your motorhome is a great way to add comfort and convenience to the RV Lifestyle.  At Demco, our passion is helping you to tow AND enjoy the experience!  Rather than making big claims and adding cumbersome “features,” we ask the question: “How can we make the experience simpler, safer and more enjoyable?”  The result is the highest quality, best-performing, made-in-the-USA products that don’t take the spotlight, but do their job so well you almost forget they are there! 

Demco SBS (Supplemental Breaking Systems) have proprietary features that provide the absolute cutting edge in towed-vehicle braking technology.  Trust your family’s safety to the proven leader in reliability and performance with over 20 years of experience! 

No one out performs Demco SBS, especially in attention to detail.  We conduct 100% finished product testing with 300% on critical components! The industry leading 5-year warranty is the true gauge of our quality. Others offer as little as just 1 year!  Demco is braking you can trust.