Parts Catalog Accessories Catalog How To Articles Tech Forums
Call Pelican Parts at 888-280-7799
Shopping Cart Cart | Project List | Order Status | Help



Go Back   PeachParts Mercedes-Benz Forum > Mercedes-Benz Tech Information and Support > Diesel Discussion

Reply
 
LinkBack Thread Tools Display Modes
  #1  
Old 07-19-2006, 02:09 PM
McRoth's Avatar
Registered User
 
Join Date: May 2002
Location: Grafton, OH
Posts: 291
Question Sudden Loss of Vacuum?

Today the car started up just fine & ran well until I stopped to fuel up. I filled up, checked the oil & drove off just fine. The problems started when I tried stopping! The brake was VERY hard to push in & didn't work too well even then. When I got to work it wouldn't shut off. Obviously I lost vacuum somehow. I checked the vac lines & nothing seems disconnected or anything. Could the pump have gone bad all of a sudden? Is there anyplace else I should check?

Thanks!

Mike

__________________
Michael Roth

1982 300TDT Wagon
1982 240D Euro!, 4spd manual-Parts car now, dead engine
88 Jeep Grand Wagoneer-fixing up for offroading
1989 Ford F150 (rust bucket) For Sale!
1953 Dodge B-4F, 1 1/2 ton Stake Bed (new restoration project)
Reply With Quote
  #2  
Old 07-19-2006, 02:18 PM
Cabernet red, actually
 
Join Date: Jan 2006
Location: Willamette Valley, OR
Posts: 503
I would check the pump by sticking your gauge where the line from the pump meets the booster hose.

It does sound like your pump died. I guess it happened very suddenly, but they've got to go sometime!
__________________
Ralph

1985 300D Turbo, CA model
248,650 miles and counting...
Reply With Quote
  #3  
Old 07-19-2006, 02:23 PM
Registered User
 
Join Date: Sep 2004
Posts: 8,971
Another possible culprit is the check valve that is inside the nipple where the vacuum line attaches to the pump. Sometimes the valve retainer rusts out and breaks, blocking the orifice. The result is the loss of vacuum, even though the pump itself is fine. You can remove the check valve easily with the pump still installed.
Reply With Quote
  #4  
Old 07-19-2006, 02:29 PM
Craig
Guest
 
Posts: n/a
It's also possible the brake booster has failed. resulting in a large leak. You can disconnect the vacuum line from the booster and see if you have vacuum at that point.
Reply With Quote
  #5  
Old 07-19-2006, 02:30 PM
McRoth's Avatar
Registered User
 
Join Date: May 2002
Location: Grafton, OH
Posts: 291
Cool! Thanks for the quick replies! I'll check those things tonight, hopefully.

Mike
__________________
Michael Roth

1982 300TDT Wagon
1982 240D Euro!, 4spd manual-Parts car now, dead engine
88 Jeep Grand Wagoneer-fixing up for offroading
1989 Ford F150 (rust bucket) For Sale!
1953 Dodge B-4F, 1 1/2 ton Stake Bed (new restoration project)
Reply With Quote
  #6  
Old 07-23-2006, 03:18 PM
McRoth's Avatar
Registered User
 
Join Date: May 2002
Location: Grafton, OH
Posts: 291
Well it looks like Craig was right. I finally got a chance to brake the fittings on the vac line & the brake booster doesn't hold a vacuum. I started the car & the vac pump is definitely pulling a vacuum.

Thanks for all the tips!!!

Mike

__________________
Michael Roth

1982 300TDT Wagon
1982 240D Euro!, 4spd manual-Parts car now, dead engine
88 Jeep Grand Wagoneer-fixing up for offroading
1989 Ford F150 (rust bucket) For Sale!
1953 Dodge B-4F, 1 1/2 ton Stake Bed (new restoration project)
Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are On




All times are GMT -4. The time now is 06:57 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2024, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2024 Pelican Parts, LLC - Posts may be archived for display on the Peach Parts or Pelican Parts Website -    DMCA Registered Agent Contact Page