Abs pump ??? - BMW M5 Forum and M6 Forums

Go Back   BMW M5 Forum and M6 Forums > BMW M5, M5 Touring, M6 and Z8 Forums > E34 M5 Discussion

E34 M5 Discussion 1988-1995 Sedan and Touring


Reply
 
LinkBack Thread Tools Rate Thread Display Modes
Old 20th August 2011, 06:22   #1
Blitzkrieg Bob
Member, P500 Sport, DSC On (>700)
 
Blitzkrieg Bob's Avatar
 
Join Date: Oct 2007
Location: In or under an E34 in Honolulu

Garage: 91 SterlingSilber-Metallic M5

Sales Feedback: (0)

Thanks: 10
Thanked 87 Times in 77 Posts
Abs pump ???

the past few weekends I have been rebuilding the front suspension and brakes... Only to find the pedal spongy after new rotors and pads... So, I do the obvious and replace the master and bleed the system.... Still spongy!!! Under full force the pedal creeps as if there is a leak or failed master, could it be the ABS pump?
__________________
1990 525 Alpine Weiss, Miller MAF conversion, Eibach springs, and Dinan cigarette lighter.

1991 M5 Sterling Silber with TMS chip, SLS delete, UUC SSK & DSSR, M Tech EVO II Wheel, Eibach springs, RD Bilstein struts and Stebro exhaust.

1991 M5 Alpine Wiess slowly coming together with a rebuilt MAF, M pars and a B&B exhaust

Last edited by Blitzkrieg Bob; 20th August 2011 at 06:23.
Blitzkrieg Bob is offline   Reply With Quote
Old 20th August 2011, 07:58   #2
intense1
Member, Sport: Off DSC: On (>50 posts)
 
Join Date: Dec 2010
Location: Honolulu, Hi

Garage: red e34 M5

Sales Feedback: (0)

Thanks: 1
Thanked 1 Time in 1 Post
Sounds like air? I would think that the ABS pump would only do something if it detects slip... But I don't know.
intense1 is offline   Reply With Quote
Old 20th August 2011, 10:12   #3
davidoli
M5 Expert (>4000)
 
Join Date: Aug 2006
Location: Suffolk

Garage: E34 M5 3.6 Sebring Grey

Sales Feedback: (0)

Thanks: 1,059
Thanked 660 Times in 529 Posts
I would be looking for air in the system / failed hoses initially Bob ............

Do you still have the original rubber brake hoses fitted ?

D
__________________
Better a day as a tiger than a lifetime as a sheep !

91 Sebring 3.6 | E28 UK RHD M5 | E34 UK RHD 3.8 | E34 M5 Touring | E24 M635CSi UK RHD

www.classicmdautos.co.uk
davidoli is offline   Reply With Quote
Old 20th August 2011, 18:47   #4
Blitzkrieg Bob
Member, P500 Sport, DSC On (>700)
 
Blitzkrieg Bob's Avatar
 
Join Date: Oct 2007
Location: In or under an E34 in Honolulu

Garage: 91 SterlingSilber-Metallic M5

Sales Feedback: (0)

Thanks: 10
Thanked 87 Times in 77 Posts
Thanks guys,

Yeah air was my first thought too, that's why I bleed it twice, checked all the lines and watched the reservoir fluid level to see if it was going down.

Dave, yes I have the original lines...Could they give/expand that much?
Blitzkrieg Bob is offline   Reply With Quote
Old 20th August 2011, 19:32   #5
intense1
Member, Sport: Off DSC: On (>50 posts)
 
Join Date: Dec 2010
Location: Honolulu, Hi

Garage: red e34 M5

Sales Feedback: (0)

Thanks: 1
Thanked 1 Time in 1 Post
Those can expand, but I've also heard that as the rubber gets older, they can disintegrate and a little rubber flap can hang down and cause a blockage in flow in 1 direction. Who knows though.
intense1 is offline   Reply With Quote
Old 20th August 2011, 19:45   #6
Blitzkrieg Bob
Member, P500 Sport, DSC On (>700)
 
Blitzkrieg Bob's Avatar
 
Join Date: Oct 2007
Location: In or under an E34 in Honolulu

Garage: 91 SterlingSilber-Metallic M5

Sales Feedback: (0)

Thanks: 10
Thanked 87 Times in 77 Posts
Quote:
Originally Posted by intense1 View Post
Those can expand, but I've also heard that as the rubber gets older, they can disintegrate and a little rubber flap can hang down and cause a blockage in flow in 1 direction. Who knows though.
Yeah, I have seen the flap/blockage thing on a friend's e34. That showed up as a dead caliper.

I have good flow to each caliper, but the pedal just doesn't feel right
Blitzkrieg Bob is offline   Reply With Quote
Old 20th August 2011, 22:41   #7
intense1
Member, Sport: Off DSC: On (>50 posts)
 
Join Date: Dec 2010
Location: Honolulu, Hi

Garage: red e34 M5

Sales Feedback: (0)

Thanks: 1
Thanked 1 Time in 1 Post
Bleed it again! I had to bleed my e46 like 5 times. Had a bubble somewhere.
intense1 is offline   Reply With Quote
Old 23rd August 2011, 00:04   #8
Blitzkrieg Bob
Member, P500 Sport, DSC On (>700)
 
Blitzkrieg Bob's Avatar
 
Join Date: Oct 2007
Location: In or under an E34 in Honolulu

Garage: 91 SterlingSilber-Metallic M5

Sales Feedback: (0)

Thanks: 10
Thanked 87 Times in 77 Posts
I am thouroghly convinced that the new master cylinder is faulty... After bleeding it at the line fittings on the ABS pump and then at each caliper twice .... No improvement
Blitzkrieg Bob is offline   Reply With Quote
Old 23rd August 2011, 00:13   #9
davidoli
M5 Expert (>4000)
 
Join Date: Aug 2006
Location: Suffolk

Garage: E34 M5 3.6 Sebring Grey

Sales Feedback: (0)

Thanks: 1,059
Thanked 660 Times in 529 Posts
Sounds probable !

D
davidoli is offline   Reply With Quote
Old 23rd August 2011, 04:43   #10
intense1
Member, Sport: Off DSC: On (>50 posts)
 
Join Date: Dec 2010
Location: Honolulu, Hi

Garage: red e34 M5

Sales Feedback: (0)

Thanks: 1
Thanked 1 Time in 1 Post
I've had them be faulty out of the box. Was it a rebuild?
intense1 is offline   Reply With Quote
Reply

Bookmarks



Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Display Modes Rate This Thread
Rate This Thread:

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


Similar Threads
Thread Thread Starter Forum Replies Last Post
Secondary air pump code still comes up after replacing the pump.. greekspeed E39 M5 and E52 Z8 Discussion 23 28th February 2011 14:47
New pre cat 02 sensors, secondary air pump, mafs, fuel pump and filter = 1 happy S2!! madyspop E39 M5 and E52 Z8 Discussion 0 12th February 2011 04:37
Kenne-Bell Boost-A-Pump Install (AKA Dinan Fuel Pump Booster #D862-7320 havasusteve03Beast E39 M5 and E52 Z8 Discussion 2 11th November 2010 05:56
urgent help needed! fuel pump relay or pump itself?? jonnycowboy E39 M5 and E52 Z8 Discussion 14 1st October 2009 15:58
engine fault, pump replaced..but which pump was that? liquido E60 M5 and E61 M5 Touring Discussion 5 27th February 2007 18:26

Loading...

All times are GMT +2. The time now is 04:57.



Everything Copyright 2000-2008. Do not use ANYTHING from this site without written permission. All images, graphics, sound files, video files and text appearing on this web site are the exclusive property of m5board.com and are protected under international copyright laws. All images, graphics, sound files, video files and text on this site are for on-screen and on-site viewing and listening only. No part of this web site may be reproduced, copied, saved, stored, manipulated, or used in any form for personal or commercial purposes without the prior written permission of m5board.com. Use of any image or graphic as the basis for another photographic concept or illustration is a violation of the copyright. Any copyright infringement will be prosecuted to the full extent of federal and international copyright laws. M5board.com is an enthusiast board and we don't condone any dangerous activity. Our airfield events are completely safe based on years of experience, we conduct them during clear visibility with mature participants that have several years of experience with high-performance automobiles, large unobstructed run-off zones on sealed off private former military airbases and we clearly mark the braking zones. If inexperienced with high speed driving we do not recommend organizing your own event but attending a high-performance driving school. The use of the term "BMW" on this site is for reference only, and does not imply any connection between m5board.com and BMW AG or BMW North America.