BMW M3 Forum (E90 E92)

BMW Garage BMW Meets Register Search Today's Posts Mark Forums Read


Go Back   M3Post - BMW M3 Forum > E90/E92 M3 Technical Topics > DIY Guides/ Discussions
 
OneEighty
Post Reply
 
Thread Tools Search this Thread
      10-07-2013, 06:22 PM   #1
PKE90
0
Private First Class
 
PKE90's Avatar
 
Drives: 2013 X5 Diesel
Join Date: Mar 2007
Location: Fairfield, CT

Posts: 107
iTrader: (2)

Brake Fluid Reservoir Question

2011 E90 M3 6spd. Dealer tells me a recent clutch malfunction is due to the fact that a hose came off the brake reservoir thus starving the master slave of fluid. When looking at the reservoir from the hood towards the windshield, the black hose attached to the white tube on the top on the right side of the reservoir. I think that is an overflow tube/hose and that the fluid going to the slave is on the bottom of the reservoir. Comments please.

PS I note that the dealer also tried to tell me that the fact I put Castrol SRF brake fluid in my car contributed so needless to say I am very wary of any of their explanations.

Thanks.
__________________

Current: 13 X5 Diesel, 991 Carrera S 50th Anniversary Edition

Gone: 11 E90 M3 ZCP, 07 328i ZSP, 05 330i ZHP, 04 996 GT3, 02 525iA, 02 996 C2, 01 Boxster S
PKE90 is offline  
Appreciate 0
Reply With Quote
      10-07-2013, 06:50 PM   #2
M3ANMACHINE
5
Hella Functional
 
M3ANMACHINE's Avatar
 
Drives: 2008 E90 M3
Join Date: Jan 2010
Location: Mission Viejo, CA

Posts: 1,741
iTrader: (6)

This sounds very fishy to me. Interested to hear from someone with better knowledge of this.
__________________

--- E90 ///M3 - AW - 6MT - APEX - Bimmerworld - Dinan - Eisenmann - Evolve - IND - KW - Mode Carbon - PFC - TMS ---

M3ANMACHINE is offline   United_States
Appreciate 0
Reply With Quote
      10-10-2013, 10:19 PM   #3
jimk
0
Captain
 
jimk's Avatar
 
Drives: 2011 E90 M3 M/T
Join Date: Jun 2009
Location: 1961 Stout Street, Suite 1823, Denver CO 80294

Posts: 732
iTrader: (5)

This may help. Which hose are they talking about?



http://realoem.com/bmw/showparts.do?...86&hg=34&fg=15
__________________
jimk is offline   United_States
Appreciate 0
Reply With Quote
      10-11-2013, 09:26 AM   #4
PKE90
0
Private First Class
 
PKE90's Avatar
 
Drives: 2013 X5 Diesel
Join Date: Mar 2007
Location: Fairfield, CT

Posts: 107
iTrader: (2)

Quote:
Originally Posted by jimk View Post
This may help. Which hose are they talking about?



http://realoem.com/bmw/showparts.do?...86&hg=34&fg=15
This is helpful but now their story is becoming even more confusing. If one looks at the expansion tank in the upper right of this image there is a plastic pipe sticking out towards the right just under the seam of the top and bottom parts of the tank. That has a hose on it in my car now but I can't find that hose in these drawings - strange,no? Now I need someone to take a picture of their tank to see if they have that hose.

http://realoem.com/bmw/showparts.do?...86&hg=34&fg=15
__________________

Current: 13 X5 Diesel, 991 Carrera S 50th Anniversary Edition

Gone: 11 E90 M3 ZCP, 07 328i ZSP, 05 330i ZHP, 04 996 GT3, 02 525iA, 02 996 C2, 01 Boxster S
PKE90 is offline  
Appreciate 0
Reply With Quote
      10-26-2013, 08:09 PM   #5
turbonyg
0
Registered
 
Drives: 2007 335I
Join Date: Oct 2013
Location: Edmonton AB

Posts: 3
iTrader: (0)

Okay, the picture you have is a very similar tank on the 2007 335i that I have in my garage.

The hose that comes from the right side of that tank goes to hose #7 in the other picture above. That is the feed line from the brake fluid reservoir to the feed port on the clutch master cylinder.

If the hose "fell off" during operation, the clutch master cylinder (CMC) would fill with air. After a few pumps the master cylinder would be dry and full of air which would cause the clutch pedal to become soft and basically lay flat on the floor of the car.

I don't think running the CMC dry would cause it to become non-functional but it definitely makes it hard to bleed the entire system.

That help?
turbonyg is offline  
Appreciate 0
Reply With Quote
      10-27-2013, 06:23 PM   #6
PKE90
0
Private First Class
 
PKE90's Avatar
 
Drives: 2013 X5 Diesel
Join Date: Mar 2007
Location: Fairfield, CT

Posts: 107
iTrader: (2)

Quote:
Originally Posted by turbonyg View Post
Okay, the picture you have is a very similar tank on the 2007 335i that I have in my garage.

The hose that comes from the right side of that tank goes to hose #7 in the other picture above. That is the feed line from the brake fluid reservoir to the feed port on the clutch master cylinder.

If the hose "fell off" during operation, the clutch master cylinder (CMC) would fill with air. After a few pumps the master cylinder would be dry and full of air which would cause the clutch pedal to become soft and basically lay flat on the floor of the car.

I don't think running the CMC dry would cause it to become non-functional but it definitely makes it hard to bleed the entire system.

That help?
That does help because it explains the symptoms...only thing that bugs me is how the hose fell off but I may just have to ascribe that to the BMW gremlins that work their mysterious ways from time to time...
__________________

Current: 13 X5 Diesel, 991 Carrera S 50th Anniversary Edition

Gone: 11 E90 M3 ZCP, 07 328i ZSP, 05 330i ZHP, 04 996 GT3, 02 525iA, 02 996 C2, 01 Boxster S
PKE90 is offline  
Appreciate 0
Reply With Quote
      10-27-2013, 07:22 PM   #7
turbonyg
0
Registered
 
Drives: 2007 335I
Join Date: Oct 2013
Location: Edmonton AB

Posts: 3
iTrader: (0)

The hose (#7) is basically just pushed on the tube on the reservoir and onto the CMC, I do not like this design at all. I feel that the hose could work itself loose if you have ever replaced either component. I put a hose clamp over the hoses themselves as added security.
turbonyg is offline  
Appreciate 0
Reply With Quote
      10-28-2013, 08:06 PM   #8
PKE90
0
Private First Class
 
PKE90's Avatar
 
Drives: 2013 X5 Diesel
Join Date: Mar 2007
Location: Fairfield, CT

Posts: 107
iTrader: (2)

Quote:
Originally Posted by turbonyg View Post
The hose (#7) is basically just pushed on the tube on the reservoir and onto the CMC, I do not like this design at all. I feel that the hose could work itself loose if you have ever replaced either component. I put a hose clamp over the hoses themselves as added security.
Super helpful. Thanks.
__________________

Current: 13 X5 Diesel, 991 Carrera S 50th Anniversary Edition

Gone: 11 E90 M3 ZCP, 07 328i ZSP, 05 330i ZHP, 04 996 GT3, 02 525iA, 02 996 C2, 01 Boxster S
PKE90 is offline  
Appreciate 0
Reply With Quote
      10-30-2013, 09:52 AM   #9
turbonyg
0
Registered
 
Drives: 2007 335I
Join Date: Oct 2013
Location: Edmonton AB

Posts: 3
iTrader: (0)

No worries, glad to have helped.
__________________
Fixes BMWs and Porsches
Drives Mitsubishi's...

NYG Racing
turbonyg is offline  
Appreciate 0
Reply With Quote
      10-30-2013, 11:16 AM   #10
happos2
0
Dingleberries
 
Drives: Gray E92 M3
Join Date: May 2012
Location: Indiana

Posts: 1,178
iTrader: (3)

How much fluid is needed when doing the brake fluid flush? Is it just 500ml or 1L?
happos2 is offline  
Appreciate 0
Reply With Quote
Post Reply

Bookmarks

Thread Tools Search this Thread
Search this Thread:

Advanced Search

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
Forum Jump


All times are GMT -5. The time now is 04:21 AM.




m3post
Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
1Addicts.com, BIMMERPOST.com, E90Post.com, F30Post.com, M3Post.com, ZPost.com, 5Post.com, 6Post.com, 7Post.com, XBimmers.com logo and trademark are properties of BIMMERPOST