G Class (W460, W461, W463) Produced 1980-2018: 290 GD, 290 GDT, 300 GD, 350 GD, 500 GE, G250, G300, G300 DT, G320, G500, G550, G55 AMG, G63 AMG

Front Diff Lock not actuating

Thread Tools
 
Search this Thread
 
Rate Thread
 
Old Oct 24, 2023 | 05:20 PM
  #1  
06G55's Avatar
Thread Starter
Junior Member
 
Joined: Sep 2023
Posts: 23
Likes: 4
06 G55
Front Diff Lock not actuating

At some point my diff locks were being difficult. I bled them, there was one line in the front and one in the rear. The center is supposed to be electrically actuated.
Now I can easily activate my center and rear differentials, but I cannot activate the front.

Where should I look to fix this? Is it maybe the vacuum system?
Reply
Old Oct 24, 2023 | 05:29 PM
  #2  
chassis's Avatar
Out Of Control!!
MBWorld Ambassador

5 Year Member
Liked
Loved
 
Joined: Sep 2018
Posts: 14,694
Likes: 4,584
From: unbegrenzt
2017 GLE350 4MATIC
Originally Posted by 06G55
At some point my diff locks were being difficult. I bled them, there was one line in the front and one in the rear. The center is supposed to be electrically actuated.
Now I can easily activate my center and rear differentials, but I cannot activate the front.

Where should I look to fix this? Is it maybe the vacuum system?
There was a thread on this recently, focused on the booster servo, or vacuum amplifier, can’t remember the MB terminology.
Reply
Old Oct 24, 2023 | 05:32 PM
  #3  
06G55's Avatar
Thread Starter
Junior Member
 
Joined: Sep 2023
Posts: 23
Likes: 4
06 G55
Originally Posted by chassis
There was a thread on this recently, focused on the booster servo, or vacuum amplifier, can’t remember the MB terminology.
Thank you for the info. Would you be able to link it by chance?
Reply
Old Oct 24, 2023 | 09:48 PM
  #4  
chassis's Avatar
Out Of Control!!
MBWorld Ambassador

5 Year Member
Liked
Loved
 
Joined: Sep 2018
Posts: 14,694
Likes: 4,584
From: unbegrenzt
2017 GLE350 4MATIC
Have a read through this thread and see if it is similar to your experience.

https://mbworld.org/forums/g-class-w...ml#post8773034
Reply
Old Oct 24, 2023 | 10:30 PM
  #5  
06G55's Avatar
Thread Starter
Junior Member
 
Joined: Sep 2023
Posts: 23
Likes: 4
06 G55
Originally Posted by chassis
Have a read through this thread and see if it is similar to your experience.

https://mbworld.org/forums/g-class-w...ml#post8773034
It is exactly what I was looking for. I am a little worried that the 55 and 63 are very different but all of those photos look like my own engine bay. Thank you.
Reply
Old Oct 26, 2023 | 11:34 AM
  #6  
xxaarraa's Avatar
Super Member
15 Year Member
Liked
Loved
Community Favorite
 
Joined: Jul 2006
Posts: 883
Likes: 93
Multiple
Originally Posted by 06G55
It is exactly what I was looking for. I am a little worried that the 55 and 63 are very different but all of those photos look like my own engine bay. Thank you.
That is my thread documenting my troubleshooting journey. I would skip all the early trial and error/learning and go straight to post #15. Good luck!

Also, when you are done, I recommend labeling all the vac lines in the locker servo area in hood by driver's firewall. I used painters tape and labeled each one for future ease.
Reply

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 


You have already rated this thread Rating: Thread Rating: 0 votes,  average.


All times are GMT -4. The time now is 05:17 PM.

story-0
New Electric Mercedes-AMG GT 4-Door Coupe Unveiled: 10 Things You Need to Know

Slideshow: Mercedes-AMG's new electric GT 4-Door Coupe trades combustion for software, synthetic noise, and more than 1,100 horsepower.

By Verdad Gallardo | 2026-05-20 20:08:15


VIEW MORE
story-1
6 Mercedes Models That Did NOT Age Well (But Are Somehow Still Cool)

Slideshow: Not every Mercedes design becomes timeless, some feel stuck in the era they came from.

By Verdad Gallardo | 2026-05-12 18:09:07


VIEW MORE
story-2
Manual Mercedes? 6 Times Sindelfingen Let Drivers Have All The Fun

Slideshow: Yes, Mercedes built manual cars, and some of them are far more interesting than you'd expect.

By Verdad Gallardo | 2026-05-02 12:36:58


VIEW MORE
story-3
Mercedes SLR McLaren 722 S Is Extremely Rare Example Modified by McLaren

Slideshow: A one-of-one U.S.-spec Mercedes-Benz SLR McLaren Roadster became even rarer after a factory-backed transformation at McLaren's headquarters.

By Verdad Gallardo | 2026-04-29 11:19:28


VIEW MORE
story-4
8 Classic Boxy Mercedes Designs That Have Aged Like Fine Wine

Slideshow: Before curves took over, Mercedes mastered the art of the straight line, and some of those shapes still look right today.

By Verdad Gallardo | 2026-04-25 12:05:49


VIEW MORE
story-5
Flawlessly Restored Mercedes 190E Evo II Heads to Auction

Slideshow: The 190E Evolution II shows how a homologation necessity became a six-figure collector icon.

By Verdad Gallardo | 2026-04-22 17:53:47


VIEW MORE
story-6
Electric Mercedes C-Class Unveiled: 11 Things You Need to Know

Slideshow: Mercedes is turning one of its core nameplates electric, and the details show just how serious this shift is.

By Verdad Gallardo | 2026-04-21 13:58:06


VIEW MORE
story-7
Mercedes EQS Gets A Major Update: Everything You Need to Know

Slideshow: Faster charging, longer range, and a controversial steer-by-wire system define the latest evolution of Mercedes-Benz EQS.

By Verdad Gallardo | 2026-04-15 10:35:34


VIEW MORE
story-8
5 Underrated Mercedes-Benz Models That Don't Get the Love They Deserve

Slideshow: These overlooked Mercedes-Benz models never got the spotlight, but they quietly delivered more than most remember.

By Verdad Gallardo | 2026-04-13 19:35:45


VIEW MORE
story-9
Mercedes 300D Has Pushed Well Past 1 Million Miles and It Ain't Stopping

Slideshow: A well-used 1991 Mercedes-Benz 300D with more than one million miles is now looking for a new owner, and it still appears ready for more.

By Verdad Gallardo | 2026-04-10 10:05:15


VIEW MORE