The most common failure of the Demco tow brake unit is a broken cable on the air actuator cylinder that is mounted on the brake pedal.
Etailer now carries a repair kit that isn't too hard to use and a lot costs less than a new air cylinder.
Demco/SMI actuator repair | Flickr (https://www.flickr.com/photos/lwade/sets/72177720314596298/) Air cylinder repair
Air cylinder repair kit
https://www.etrailer.com/Accessories-and-Parts/Demco/DM56VR.html
Complete air cylinder...yes it's expensive!
https://www.etrailer.com/Accessories-and-Parts/Demco/DM6215.html
Larry
Flickr wants me to log in, Larry.
Flickr wants me to log in, Larry.
Try it again.
Larry
I repaired my Stay-in-Play Duo's air cylinder with this kit. If you have an older cylinder you may have a bit of trouble disassembling it. Once you have replaced the cable on an older cylinder you don't have the same problem with disassembly; removal, repair and replacement takes under a half-hour with the cable in hand. I carried a spare cable.
If you mount the cylinder too close to the firewall the cable develops a kink, and eventually breaks there. The second time the cable broke I moved the cylinder away from the firewall by reversing the mounting brackets. That should have reduced or eliminated the kinking. I don't know, as I've sold the car.
Mark H.
Try it again.
Still wants me to log in. Using an ipad and a PC.
Still wants me to log in. Using an ipad and a PC.
Try the link now, I think I found the problem
Larry
Working now. I am new to towing and also have the Demco unit so appreciate the info!