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1978 450SL
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340 Posts
Discussion Starter #1
Of course, the cruise control doesn't work. That's not a problem. But here's the question:
There is a black w/ yellow(possibly grey) stripe vacuum line going to the cruise control from one of the main junctions of the vacuum line coming off the back of the intake manifold. Connections look good. Line not brittle or broken. However, there is a larger, solid black 'line' also going to the cruise control. It ends at the cruise control with a screw type fitting. The other end of this larger black line goes through the firewall and while looking for some other stuff, we discovered that the line is cut. It just hangs under the dash, attached to nothing. Me thinks that is probably not right. I couldn't find any cruise control info on the 107 manual that's on line--hope someone can give me a link so I can see how the cruise control works, what vacuum lines go to it from where, etc. Thanks.
 

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1973 450 SL
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1,885 Posts
I have several articles on the VDO cruise control system. I scanned them and am unable to get the file size small enough to attach here.

PM me with an email address and I'll send them to you that way.
 

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2001 S430, 1988 560sl, 1977 450sl, Donor car 1979 450sl,
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180 Posts
Can you PM me the same file. I have a 77 450sl with the hose just hanging near the brake pedal.Thanks
 

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'79 450 SL.. '13 Escape SE 2.0 Turbo...'06 Hummer H3....'84 Ford F-150 HO..'62 TBird Convertible..
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991 Posts
Jim...Haven't seen any updates on your car lately. Where do the repairs stand now ?..j..
 

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2001 S430, 1988 560sl, 1977 450sl, Donor car 1979 450sl,
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180 Posts
Jim...Haven't seen any updates on your car lately. Where do the repairs stand now ?..j..
Thanks for asking. slowed down a little with too many other things to do but here we go.....
 

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'79 450 SL.. '13 Escape SE 2.0 Turbo...'06 Hummer H3....'84 Ford F-150 HO..'62 TBird Convertible..
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991 Posts
Did you ever get the misfire/idle problems fixed ? I recall you took it to a repair shop ?
 

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2001 S430, 1988 560sl, 1977 450sl, Donor car 1979 450sl,
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180 Posts
Did you ever get the misfire/idle problems fixed ? I recall you took it to a repair shop ?
No repair shop. I cleaned all the injectors and replaced the o rings and holders. Runs nice now.
 

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'79 450 SL.. '13 Escape SE 2.0 Turbo...'06 Hummer H3....'84 Ford F-150 HO..'62 TBird Convertible..
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991 Posts
Great..What is the plan with the posted pictures ?..Paint ??
 

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'79 450 SL.. '13 Escape SE 2.0 Turbo...'06 Hummer H3....'84 Ford F-150 HO..'62 TBird Convertible..
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991 Posts
After you've had her on the road a few times..you'll forget all the problems of the past !.......Well done !...jv..
 

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2001 S430, 1988 560sl, 1977 450sl, Donor car 1979 450sl,
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180 Posts
After you've had her on the road a few times..you'll forget all the problems of the past !.......Well done !...jv..
i remember everything but dont care cus i enjoy doing it. Always learning something which is good.
 

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1978 450SL
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8 Posts
I also have the same vacuum hose that goes through the firewall and ends nowhere.
should this not be connected to a brake pedal switch?
Thanks
 

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1978 450SL
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Of course, the cruise control doesn't work. That's not a problem. But here's the question:
There is a black w/ yellow(possibly grey) stripe vacuum line going to the cruise control from one of the main junctions of the vacuum line coming off the back of the intake manifold. Connections look good. Line not brittle or broken. However, there is a larger, solid black 'line' also going to the cruise control. It ends at the cruise control with a screw type fitting. The other end of this larger black line goes through the firewall and while looking for some other stuff, we discovered that the line is cut. It just hangs under the dash, attached to nothing. Me thinks that is probably not right. I couldn't find any cruise control info on the 107 manual that's on line--hope someone can give me a link so I can see how the cruise control works, what vacuum lines go to it from where, etc. Thanks.
I have exactly the same problem. The line just hangs under the dash. Shouldn't that line go to brake switch?
 

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1978 450SL
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8 Posts
thanks for that.
Ok.... now I guess i need to troubleshoot why my cruise control does not work....
 

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Premium Member
2007 ML320CDI, 1959 220SE, 1971 280SL, 1982 380SL
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598 Posts
The Black line is a vent line. The most troublesome part of both the early Vacume cruise control and the later electrical type is the control box mounted under the speedometer and bolted to the pedal assembly. James Brown has been succesful working on these as well as those provided by Programma
 

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1978 450SL
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Many thanks Rick.
I would like to repair my own if possible although the programma option is a good fallback.
How do I contact James Brown? The net is full of James Brown references - but naturally it is all about the singer (RIP).
Thanks
 
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