Home Forums Articles How To's FAQ Register
Go Back   Xoutpost.com > BMW SAV Forums > X5 (E53) Forum
Fluid Motor Union
User Name
Password
Member List Premier Membership Search Today's Posts Mark Forums Read

Xoutpost server transfer and maintenance is occurring....
Xoutpost is currently undergoing a planned server migration.... stay tuned for new developments.... sincerely, the management


Reply
 
LinkBack Thread Tools Display Modes
  #1  
Old 01-10-2019, 09:11 PM
Member
 
Join Date: Oct 2014
Location: USA
Posts: 4
DriverX is on a distinguished road
Brake fluid sludge

Hi friends,

I recently did my own brake fluid flush for the first time. I used some of the online DIY/videos. Seems like everything has turned out well, pedal is less mushy.

I had a hard time discerning when there was a change in color between the old/new fluid - and I used a lot of new fluid. Next time I might use the blue fluid to see if it helps, but I heard that it can stain the reservoir.

Anyways, my main question was with regards to the reservoir. While emptying it, I noticed what I was taking out was full of floating "boogers" let's say. Then I peeked into the reservoir, and saw the filter was full of this white-ish sludge type of goop. I did my best to get it all out, but probably some was left behind. I couldn't figure out how to remove the filter so I just left it.

It all sort of floated to the bottom of my catch bottle. I couldn't see anything else suprising in the reservoir, and actually there wasn't much sludge in there.

But I am wondering, what is this sludge? I am sure it's a product of infrequent fluid flushes, as the last one was probably 4 years ago and "done"" by the dealer (I just came into possession of the car so don't blame me!). Should I be worried?

Actually what came through the lines at the wheels was sludge-free. I didn't even get much in the way of bubbles. Maybe some minute particles here and there that I really had to look hard to see, but that's all.

So far so good, for anyone on the fence about trying to DIY, it wasn't hard at all. Just took me a lot of time doing it for the first time.

Thanks everyone
Reply With Quote

Sponsored Links

  #2  
Old 01-11-2019, 02:52 PM
dkl's Avatar
dkl dkl is offline
Member
 
Join Date: Mar 2005
Location: Southern Cal
Posts: 2,731
dkl is on a distinguished road
FYI - You can no longer get that "blue" fluid and you can thank our stupid regulations for that. And yes, that "blue" fluid does stain the reservoir, but it self-unstain after about 2 fluid changes with the regular stuff.

Sorry - can't answer your other question as I haven't ran across this on mine.
__________________
2004 X5 3.0i
Born 02/04
Delivered 03/04
Reply With Quote
  #3  
Old 01-11-2019, 04:52 PM
Member
 
Join Date: Feb 2013
Location: nyc
Posts: 1,721
jsoto is on a distinguished road
I concur on the staining comment. I've been blue-free for awhile and the rides have lost the embedded dye..
Reply With Quote
  #4  
Old 01-11-2019, 05:39 PM
semcoinc's Avatar
Member
 
Join Date: Dec 2014
Location: Dallas, TX
Posts: 709
semcoinc is on a distinguished road
I have been running Motul DOT 5.1 synthetic brake fluid for several years in my BMWs at flush time.

https://www.amazon.com/Motul-100950-.../dp/B07KYWH2W8



Less propensity for water absorption, higher boiling point and longer service life, IMHO.

This fluid in conjunction with SS/teflon brake line upgrades has given me a much firmer pedal feel and braking action.

To each their own.

Mike
__________________

Mike
Dallas, TX & Appleton, WI
2003 E53 4.4i
2003 E46 330Xi
2007 E90 335Xi
2011 F25 X3 28i
Reply With Quote
  #5  
Old 01-11-2019, 06:01 PM
wpoll's Avatar
Member
 
Join Date: Sep 2015
Location: South Island, New Zealand
Posts: 2,135
wpoll will become famous soon enough
Be careful not NOT mix DOT 5 fluid with DOT 3, DOT 4 etc. fluids.

DOT 5.1. is OK though...

DOT 3, 4 and 5.1 are glycol-based.

It's a bit confusing...

DOT 5 is silicone-based and will NOT mix with the others - it can result in blocked brake systems.
__________________
Wayne
2005 BMW X5 3.0d (b 02/05)
2001 BMW F650GS Dakar (b 06/01)
Reply With Quote
  #6  
Old 01-11-2019, 06:04 PM
semcoinc's Avatar
Member
 
Join Date: Dec 2014
Location: Dallas, TX
Posts: 709
semcoinc is on a distinguished road
Quote:
Originally Posted by wpoll View Post
Be careful not NOT mix DOT 5 fluid with DOT 3, DOT 4 etc. fluids.

DOT 5.1. is OK though...

DOT 3, 4 and 5.1 are glycol-based.

It's a bit confusing...

DOT 5 is silicone-based and will NOT mix with the others - it can result in blocked brake systems.
EXACTLY!!!

It is critical that folks considering a synthetic brake fluid in our ABS brake system equipped vehicles use DOT 5.1

Mike
__________________

Mike
Dallas, TX & Appleton, WI
2003 E53 4.4i
2003 E46 330Xi
2007 E90 335Xi
2011 F25 X3 28i
Reply With Quote
  #7  
Old 01-11-2019, 06:05 PM
wpoll's Avatar
Member
 
Join Date: Sep 2015
Location: South Island, New Zealand
Posts: 2,135
wpoll will become famous soon enough
Quote:
Originally Posted by semcoinc View Post
I have been running Motul DOT 5.1 synthetic brake fluid for several years in my BMWs at flush time.

Less propensity for water absorption, higher boiling point and longer service life, IMHO.
Was just reading the spec sheets for this Motul DOT 5.1 - it's boiling point is lower that that stated for their DOT4.... (DOT 5.1 dry 272C vs DOT 4 dry 328C)
__________________
Wayne
2005 BMW X5 3.0d (b 02/05)
2001 BMW F650GS Dakar (b 06/01)
Reply With Quote
  #8  
Old 01-11-2019, 06:06 PM
semcoinc's Avatar
Member
 
Join Date: Dec 2014
Location: Dallas, TX
Posts: 709
semcoinc is on a distinguished road
Quote:
Originally Posted by wpoll View Post
Was just reading the spec sheets for this Motul DOT 5.1 - it's boiling point is lower that that stated for their DOT4.... (DOT 5.1 dry 272C vs DOT 4 dry 328C)
K, I stand corrected, however, do you find DOT 5.1 to be higher than DOT 3?

Mike
__________________

Mike
Dallas, TX & Appleton, WI
2003 E53 4.4i
2003 E46 330Xi
2007 E90 335Xi
2011 F25 X3 28i
Reply With Quote
  #9  
Old 01-11-2019, 06:11 PM
wpoll's Avatar
Member
 
Join Date: Sep 2015
Location: South Island, New Zealand
Posts: 2,135
wpoll will become famous soon enough
Quote:
Originally Posted by semcoinc View Post
K, I stand corrected, however, do you find DOT 5.1 to be higher than DOT 3?

Mike
Wasn't out to correct anyone - I would have sided with your original statement too.

Just thought it was weird that the "higher" spec fluid was rated lower. Devil is in the detail though, as they don't state the "wet" boiling point. It seem the DOT 5.1. remains consistent at 272C while the DOT 4 performance drops off as it absorbs water - they state the wet boiling point as only 204C, so it's clear that the DOT 5.1 holds up better as it ages.

So you are correct - out of the bottle the DOT 4 is better but as soon as it's in service and starts absorbing water, it's boiling point drops.

The DOT 5.1 is as you said...
__________________
Wayne
2005 BMW X5 3.0d (b 02/05)
2001 BMW F650GS Dakar (b 06/01)
Reply With Quote
  #10  
Old 01-11-2019, 06:15 PM
semcoinc's Avatar
Member
 
Join Date: Dec 2014
Location: Dallas, TX
Posts: 709
semcoinc is on a distinguished road
Thanks for the additional insight on this critical fluid wpoll

Mike
__________________

Mike
Dallas, TX & Appleton, WI
2003 E53 4.4i
2003 E46 330Xi
2007 E90 335Xi
2011 F25 X3 28i
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 Off
Trackbacks are On
Pingbacks are On
Refbacks are On





All times are GMT -4. The time now is 04:56 AM.
vBulletin, Copyright 2019, Jelsoft Enterprises Ltd. SEO by vBSEO 3.6.0
2017 Xoutpost.com. All rights reserved. Xoutpost.com is a private enthusiast site not associated with BMW AG.
The BMW name, marks, M stripe logo, and Roundel logo as well as X3, X5 and X6 designations used in the pages of this Web Site are the property of BMW AG.
This web site is not sponsored or affiliated in any way with BMW AG or any of its subsidiaries.