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Topic: Demco/SMI actuator repair (Read 304 times) previous topic - next topic
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Demco/SMI actuator repair
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  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
Larry
2003 23.5' Front Lounge, since new.  Previously 1983 22' Front Lounge.
Tow vehicles  2020 Jeep Wrangler Rubicon, 2001 Jeep Cherokee
Photo Collection: Lazy Daze
Re: Demco/SMI actuator repair
Reply #1 –
Flickr wants me to log in, Larry.
Greg & Victoria
2017 Mid-Bath  “Nocona” towing a manual 2015 Forester
Previously a 1985 TK
SKP #61264
Re: Demco/SMI actuator repair
Reply #3 –
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.
Former owner, 31-foot gas Class A
Former owner, 1997-8 mid-bath
 
Re: Demco/SMI actuator repair
Reply #6 –
Working now.  I am new to towing and also have the Demco unit so appreciate the info!
Greg & Victoria
2017 Mid-Bath  “Nocona” towing a manual 2015 Forester
Previously a 1985 TK
SKP #61264