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#1
12-11-2008, 07:11 PM
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Cruise Control won't go off 1985 300 TDT
Cruise control stops as long as the brake is applied, but resumes when the foot is taken off the brake so the car accelerates back up to the setpoint. I had this problem before and it went away when I found and reconnected a disconnected vacuum line under the hood. But then the cruise control was still surging some, so I resoldered it and found some loose solder joints in the process. Now cruise control is solid but does not want to terminate on brake application. I check vacuum lines again and found nothing obvious. Need a sleuth. Any help much appreciated.
Roger 
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#2
12-11-2008, 07:18 PM
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Do your brake lights work? If the brake switch has failed, the cruise control won't turn off.
Can you turn off cruise with the control stalk? Jeremy
__________________
 "Buster" in the '95 Our all-Diesel family 1996 E300D (W210) . .338,000 miles Wife's car 2005 E320 CDI . . 113,000 miles My car Santa Rosa population 176,762 (2022) Total. . . . . . . . . . . . 627,762 "Oh lord won't you buy me a Mercedes Benz." -- Janis Joplin, October 1, 1970
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#3
12-11-2008, 07:21 PM
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Hopefully you will run out of fuel soon.
__________________
1999 w140, quit voting to old, and to old to fight, a god damned veteran, deutschland deutschland uber alles uber alles in der welt
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#4
12-11-2008, 07:24 PM
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Don't let JimmyL see that Rogue 'T' on the end of your car description. You'll be lambasted in the nicest way possible.
All kidding aside, Jeremy is spot on. Check all your brake light bulbs. There is a pretty good write up about it at that place in Cali that rebuilds the amps and actuators. GDL or GDI or something like that. Someone with better short term memory will be able to tell you. Good Luck!
__________________
 1981 300TD "The Green Lantern" 1980 300TD 1983 300D Euro "China Cat" Last edited by StaggerLee; 12-11-2008 at 07:26 PM. Reason: spelling
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#5
12-11-2008, 08:20 PM
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The brake lights do work and the control stalk can shut off the cruise control. ????
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#6
12-11-2008, 11:20 PM
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On the way home from work tonight, I found that for no apparent reason, that brake use is now terminating crusie control correctly. Weird - but I'll take it if it stays.
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#7
12-11-2008, 11:22 PM
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I would definitely check your switch. Im not an electrical engineer but im guessing that the "terminate" function on the CC amp is extremely basic and foolproof to prevent failure. I doubt its the amp
__________________
 1981 300SD 512k OM603
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#8
12-11-2008, 11:43 PM
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where is the switch located?
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#9
12-11-2008, 11:53 PM
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Quote:
 I do try and not kick a person when they are down, unless they seem irritating, which this poster certainly is not! Seems very logical and informed. However, when this issue has been located we might have to get a pic of that wagon hatch......   Quote:
__________________
Jimmy L. '05 Acura TL 6MT  2001 ML430 My Spare Gone: '95 E300 188K "Batmobile" Texas Unfriendly Black '85 300TD 235K "The Wagon" Texas Friendly White '80 240D 154K "China"  Scar engine installed'81 300TD 240K "Smash" '80 240D 230K "The Squash" '81 240D 293K"Scar" Rear ended harder than Elton John
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#10
12-12-2008, 12:12 AM
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Googled the EGL write up. This should get me what I need. Thanks for the gentle prodding. Here is the link in case anyone else needs it.
http://gdl-online.com/test024.html
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#11
12-12-2008, 12:21 AM
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Quote:
"Please note that these ideas and procedures are for someone who has the time, inclination and technical ability " I guess that leaves me out......I don't think I have the "time".
__________________
daw_two Germantown, TN Links: Sold last car --- 05/2012 1984 300D Light Ivory, Red interior No longer selling Cluster Needles Paint No longer selling New Old Stock (NOS) parts Past: 3/2008 1986 300SDL "Coda" 04/2010 1965 190D(c) "Ben" & many more
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#12
12-12-2008, 01:04 AM
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AFAIK, the brake light switch is under the dash and connected to the brake pedal somehow. It should be pretty obvious once you get the driver's under-dash panel off and look. It's possible that the contacts in the switch are burned from years of use and are not always making contact as well as they used to; since you can't see the brake lights while you drive, you would never know.
Knowing Mercedes of that era, I believe it should be possible to remove the switch and take it apart. Careful cleaning of the contacts with very light sandpaper or emery cloth should restore clean operation. At worst you would have to replace the switch (sorry I can't find it listed in FastLane). The problem is unlikely to be due to flaky brake lights, sockets, or wiring, since they would do the opposite, they would prevent you from engaging cruise control, not disengaging. Similarly, a short to ground of the brake light wiring would blow a fuse so it's not that. Jeremy .
__________________
"Buster" in the '95 Our all-Diesel family 1996 E300D (W210) . .338,000 miles Wife's car 2005 E320 CDI . . 113,000 miles My car Santa Rosa population 176,762 (2022) Total. . . . . . . . . . . . 627,762 "Oh lord won't you buy me a Mercedes Benz." -- Janis Joplin, October 1, 1970
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#13
12-12-2008, 01:17 AM
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Much appreciated. Unless I come back whining, consider it whipped.
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