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  #1  
Old 12-07-2008, 12:29 PM
Utica W124
 
Join Date: Dec 2008
Location: Utica NY
Posts: 10
4 matic Light on

Yesterday, I was driving my 1992 300e and my 4 Matic warning light came on. I followed a test procedure that I found online and this was the trouble code that I found. "10-Hydraulic valve 3, short- or open-circuit, OR brake switch defect." Can anyone tell me what I should start looking at? I'm new to this. Thanks

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  #2  
Old 12-07-2008, 01:21 PM
whipplem104's Avatar
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Location: seattle
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Start with the stop lamp switch. These are very common on the 4-matic.
They are also fairly cheap and easy to replace.
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  #3  
Old 12-14-2008, 12:45 PM
Utica W124
 
Join Date: Dec 2008
Location: Utica NY
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If that switch is bad, does that mean that the brake lights will not illuminate?
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  #4  
Old 12-14-2008, 01:09 PM
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Location: Northeast Indiana
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Are your brake-lights European nickle-plated sockets with 21watt bulb or US-style copper-base?

Mine threw brake-light switch codes with a US-style replacement brake light bulb.
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  #5  
Old 12-14-2008, 08:27 PM
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No the brake lamp switch can cause the code with the lights still working.
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  #6  
Old 12-14-2008, 08:27 PM
Utica W124
 
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Location: Utica NY
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I have idea. How can I tell?
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  #7  
Old 12-14-2008, 08:28 PM
Utica W124
 
Join Date: Dec 2008
Location: Utica NY
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Quote:
Originally Posted by whipplem104 View Post
No the brake lamp switch can cause the code with the lights still working.
How do I tell if it is the problem? Just replace it?
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  #8  
Old 12-14-2008, 08:34 PM
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Yes. They are cheap and easy to repl.
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  #9  
Old 12-15-2008, 08:58 PM
Utica W124
 
Join Date: Dec 2008
Location: Utica NY
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I ordred the part. Is it ok to drive until I Change it?
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  #10  
Old 12-15-2008, 09:30 PM
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yes
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  #11  
Old 12-23-2008, 10:24 PM
Utica W124
 
Join Date: Dec 2008
Location: Utica NY
Posts: 10
I just replaced the switch and it worked. What a relief! What does the brake light switch have to do with the 4 Matic? Thanks for the advice!
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  #12  
Old 12-24-2008, 10:33 AM
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Join Date: Apr 2002
Location: waterloo ontario
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the brake switch has 2 other functions.when the peddle is pushed it activates the ABS.when released it activates the 4 matic.

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