M-Class (W163) Produced 1998-2005: ML 230, ML 320, ML 350, ML 400 CDI, ML 430, ML 500, ML 270 CDI

ABS Pump Help?

Thread Tools
 
Search this Thread
 
Rate Thread
 
Old Dec 21, 2019 | 09:00 PM
  #1  
Michael Vanegas's Avatar
Thread Starter
Junior Member
 
Joined: Jul 2019
Posts: 29
Likes: 1
W163 - ML320 - 1999
Question ABS Pump Help?

Hey Everyone!

Would anyone happen to have a picture of the schematic for a ML320 ABS assembly or something of the sort? I seem to have a leak that is accumulating directly underneath it but I cannot find where the leak is coming from......

I have attached pictures in order to show what the leak looks like. Any help would be appreciated!




Cheers to all and have a great holiday season! Thanks for your help!
Reply
Old Dec 22, 2019 | 01:14 AM
  #2  
khomer2's Avatar
MBWorld Fanatic!
 
Joined: Nov 2015
Posts: 1,456
Likes: 140
From: Westcoast/Interior
02w163ML500 / 97w210E50AMG / 99w202C230k / 95w124500e-wip
There is no schematic of an abs pump, that I am aware of.
Other than the leak, what symptoms or CELs are you getting, if any?
Reply
Old Dec 22, 2019 | 07:13 AM
  #3  
Michael Vanegas's Avatar
Thread Starter
Junior Member
 
Joined: Jul 2019
Posts: 29
Likes: 1
W163 - ML320 - 1999
The main symptom I am getting is very faded brakes. The brakes still jump back to their original position, but in order to get the slightest brake action requires me pushing the pedal to the floor. Also the BAS ESP light has come on in the dash.
Reply
Old Dec 22, 2019 | 11:34 AM
  #4  
khomer2's Avatar
MBWorld Fanatic!
 
Joined: Nov 2015
Posts: 1,456
Likes: 140
From: Westcoast/Interior
02w163ML500 / 97w210E50AMG / 99w202C230k / 95w124500e-wip
Originally Posted by Michael Vanegas
The main symptom I am getting is very faded brakes. The brakes still jump back to their original position, but in order to get the slightest brake action requires me pushing the pedal to the floor. Also the BAS ESP light has come on in the dash.
Scan for codes and post.

W163s are known for soft brake pedals as commented by many other members. I personally have not experienced this. The other common issue is the brake hiss when one depresses the brake pedal or releases it (this is another issue).

Have you checked your brake fluid level?
When was the last time you replaced the brake fluids? (done a complete flush/bleed of the system)
Reply
Old Dec 23, 2019 | 05:59 AM
  #5  
Maj. Dundee's Avatar
MBWorld Fanatic!
 
Joined: Oct 2011
Posts: 7,107
Likes: 765
From: Bronx, N.Y.
2002 ML 320 & 2006 ML500
Post your full vin# for the correct part number.
Reply
Old Dec 25, 2019 | 08:02 PM
  #6  
Michael Vanegas's Avatar
Thread Starter
Junior Member
 
Joined: Jul 2019
Posts: 29
Likes: 1
W163 - ML320 - 1999
Hey Khomer,

So I tried taking it to a nearby mechanic and they said that they couldn't read the codes...... The brake does hiss a little bit but the booster was recently changed less than a month ago.

The brake fluid level in the resevoir does fall pretty quickly, give or take in about a weeks time the whole thing is pretty much emptied out. No leaks though can be seen on the lines. Just on the bottom of the ABS unit.

The last time I gave the car a brake flush was about 2 years ago...
Reply
Old Dec 25, 2019 | 08:04 PM
  #7  
Michael Vanegas's Avatar
Thread Starter
Junior Member
 
Joined: Jul 2019
Posts: 29
Likes: 1
W163 - ML320 - 1999
Hey Maj Dundee,

The VIN is 4JGAB54E4XA071512.
Reply
Old Dec 26, 2019 | 03:45 AM
  #8  
Maj. Dundee's Avatar
MBWorld Fanatic!
 
Joined: Oct 2011
Posts: 7,107
Likes: 765
From: Bronx, N.Y.
2002 ML 320 & 2006 ML500
Other than wiring diagrams, I don't know what you mean by schematics. If you are sure that you have a leak in the brake regulator, schematics won't help.

Try and find a used one with this number and this number only.



Reply
MB World Stories

The Best of Mercedes & AMG

story-0

8 Classic Boxy Mercedes Designs That Have Aged Like Fine Wine

 Verdad Gallardo
story-1

Flawlessly Restored Mercedes 190E Evo II Heads to Auction

 Verdad Gallardo
story-2

Electric Mercedes C-Class Unveiled: 11 Things You Need to Know

 Verdad Gallardo
story-3

Mercedes EQS Gets A Major Update: Everything You Need to Know

 Verdad Gallardo
story-4

5 Underrated Mercedes-Benz Models That Don't Get the Love They Deserve

 Verdad Gallardo
story-5

Mercedes 300D Has Pushed Well Past 1 Million Miles and It Ain't Stopping

 Verdad Gallardo
story-6

10 Most Reliable Mercedes-Benz Models You Can Buy Used

 Verdad Gallardo
story-7

Mercedes Teases Updated EQS With Steer-By-Wire and a Yoke

 Verdad Gallardo
story-8

8 Mercedes Models With Poor Reliability Records

 Verdad Gallardo
story-9

Magnificent New Mercedes-Maybach S-Class Revealed: 12 Things to Know

 Verdad Gallardo

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 05:55 PM.

story-0
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-1
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-2
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-3
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-4
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-5
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
story-6
10 Most Reliable Mercedes-Benz Models You Can Buy Used

Slideshow: From bulletproof sedans to surprisingly tough SUVs, these Mercedes models proved that the three-pointed star can go the distance.

By Verdad Gallardo | 2026-04-08 09:55:49


VIEW MORE
story-7
Mercedes Teases Updated EQS With Steer-By-Wire and a Yoke

Slideshow: The 2027 update adds a fully digital steering system, revised styling, and potential charging upgrades as the company looks to revive interest in the luxury EV.

By Verdad Gallardo | 2026-04-04 10:24:38


VIEW MORE
story-8
8 Mercedes Models With Poor Reliability Records

Slideshow: From problematic air suspensions to early dual-clutch transmission issues, these specific models and years stand out as the least dependable modern Mercedes vehicles.

By Verdad Gallardo | 2026-03-26 18:08:10


VIEW MORE
story-9
Magnificent New Mercedes-Maybach S-Class Revealed: 12 Things to Know

Slideshow: Mercedes-Maybach has refreshed the S-Class with new lighting signatures, AI-driven software, and even more elaborate rear-seat luxury.

By Verdad Gallardo | 2026-03-25 18:01:51


VIEW MORE