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 10-24-2005, 05:16 PM
vwoodruff
Guest
 
Posts: n/a
Apparently I'm a brake bleedin' ignoramus!

Hey all...

I replaced the front calipers and pads on the front of a '74 240d. I used the pump-and-hold, 2 person method of bleeding the lines and now have jet streams of brake fluid coming from the front bleed screws.

Well, there are still absolutely zero brakes (i.e. the pedal goes to the floor). I decided to bleed the rear lines and they are barely dripping out fluid, even after 6 or 7 repetitions.

How is it that the front brakes are shooting out fluid but not working? Is there air behind this jetstream?

And I have checked both halves of the MC reservoir...

Reply With Quote
  #2  
Old 10-24-2005, 05:24 PM
dannym's Avatar
I'm not here
 
Join Date: Oct 2004
Location: Deltona, Florida
Posts: 2,360
Your not going to get any hydraulic pressure if your calipers are streeming fluid. Can't you get it to stop?

There's a partition in the fluid tank which seperates the front from the rear brakes. You need to make sure there is enough fluid in the tank to go over the partition when bleeding the rear brakes or pour fluid directly into the back of the tank during your bleeding operation.

Danny
__________________
1984 300SD Turbo Diesel 150,000 miles

OBK member #23

(\__/)
(='.'=) This is Bunny. Copy and paste bunny into your
(")_(") signature to help him gain world domination
Reply With Quote
  #3  
Old 10-24-2005, 05:50 PM
Unregistered Abuser
 
Join Date: Jul 2005
Location: Eau Claire WI
Posts: 968
I think what he's saying is that hes getting a stream out of the bleeders when he pumps them and opens the bleeder...

You may have either a bad wheel cylinder (doughtflully on both sides), or bad lines (hard or soft)... if not, u might have a bad master cylinder... When you pump the brakes to build up pressure (so u can open the bleader), is the rear side drawing in fluid?

Thanks alot
~Nate
Reply With Quote
  #4  
Old 10-24-2005, 06:00 PM
Registered User
 
Join Date: Sep 2003
Location: Manhattan, KS
Posts: 596
When I did the SDL, I had a lot of trouble getting the rears bled. Turns out I had let the reservoir get way too low and got air in. I was really surprised how full the reservoir needed to be to make sure the rear compartment had fluid in it.
__________________
Keep everything as simple as possible-but no simpler--Albert Einstein
Reply With Quote
  #5  
Old 10-24-2005, 07:14 PM
Banned
 
Join Date: May 2002
Location: Blue Point, NY
Posts: 25,396
Quote:
Originally Posted by Habanero
When I did the SDL, I had a lot of trouble getting the rears bled. Turns out I had let the reservoir get way too low and got air in. I was really surprised how full the reservoir needed to be to make sure the rear compartment had fluid in it.
I think we've all done it on the SDL.

I'm going to rephrase your statement because it's important:

"I was really surprised how full the front compartment needed to be to make sure the rear compartment had fluid in it."
Reply With Quote
  #6  
Old 10-24-2005, 07:22 PM
vwoodruff
Guest
 
Posts: n/a
I'm pretty sure that the rear compartment is full up... it is nearly impossible to see, so I pulled the screen and rubber gasket-thingy to check on that side of the reservoir... it was pretty full. It is possible that at one point it was low, but that isn't the case now.

Sorry if I misled... the fluid is streaming after the brakes have been pumped and held and I loosen the bleeder bolt... this is what puzzles me. How could it be getting this type of pressure but not engage the front brakes?

Nate, when you asked whether the rear side is drawing in fluid, are you referring to at the reservoir?
Reply With Quote
  #7  
Old 10-24-2005, 07:26 PM
Registered User
 
Join Date: Oct 2003
Location: Central, CA
Posts: 97
Also, the rear part of the master cylinder does not squirt as much fluid as the front section.
A lot more bleeding strokes are needed for the rear.
__________________
1985 300D California w/cat. (257,000 + Miles)
1980 300SD (208,000 + Miles)
Reply With Quote
  #8  
Old 10-25-2005, 06:00 PM
Registered User
 
Join Date: Aug 2005
Posts: 4
Brake Bleeding

The only way I have been successful was to pressure bleed the system.
Reply With Quote
  #9  
Old 10-25-2005, 10:28 PM
zeiglerr's Avatar
Registered User
 
Join Date: Aug 2004
Location: Beautiful Pennsylvania
Posts: 51
If you have ABS, you need to pressure-bleed the brakes.

__________________
Reid
Past ('59 220Sb, 2-'59 190's, '92 300D 2.5T)
Current
'04 E320 4Matic Wagon
'00 E320 4Matic Wagon
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 04:05 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2018 Pelican Parts, LLC - Posts may be archived for display on the Peach Parts or Pelican Parts Website -    DMCA Registered Agent Contact Page