Click to go to Forum Home Click to go to maXbimmer Home

Go Back   maXbimmer Forums > maXimum Tech > 3 Series > E36 (1991 - 1999)
User Name
Password


Welcome to Maxbimmer.com!

You are currently viewing our boards as a guest which gives you limited access to view most discussions and access our other features. By joining our free community you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is fast, simple and absolutely free so please, join our community today!

Reply
 
Thread Tools Rate Thread Display Modes
Old 08-23-2013, 05:08 PM   #1
LVP
2nd Gear Member
 
Join Date: Dec 2004
Location: Hamilton
Posts: 161
Bleeding/controlling ABS unit

Hi,

Does anyone have access to software/tools to access and control the ABS unit during a brake bleed? I am trying to eliminate the ABS as a source of my soft brake pedal. I would like to be able to:
- Close off all ABS ports to ensure I can get a stiff pedal. If the pedal is still mush, I know the problem lies in the master or ABS unit. If the pedal is hard, I know the problem is past the ABS.
- I'd then like to open each port one at a time to bleed each channel. This way I can systematically firm up each brake channel and get the pedal hard again.

The last two shops I went to weren't really sure how to actually use the software and control the valves. Ideally the dealer software should do it, but my hopes of getting to a mechanic that truly wants to spend the time to fix this while not taking my arm and leg for it are slim.

Anywhere in the Toronto/Niagara/London areas are fine - I can travel if someone has the software to tackle this. If you have the software or know of someone that does, please drop me a note or post.

Thanks.
LVP is offline   Reply With Quote
Old 08-23-2013, 07:47 PM   #2
Ceeker
Parts hoarding partner...
 
Ceeker's Avatar
 
Join Date: Nov 2007
Location: Toronto
Posts: 3,363
you could try gravity bleeding the system first going from each wheel furthest to closest to master. Then you can start the car and leave it running to bleed the abs unit. bleed like you would when the car is off. you will of course need someone to pump the peddle for this. Start there and see if there is a change.
__________________

I think I've had 14 bmw's in 4 years.
2 IX's -sold and parts
2 325i 4 dr - sold
4 318is all white - sold and parts
1 87 325is red - parts
1 89 325i vert grey - parts
1 90 325is white - keepin
1 87 325i vert -red - keepin
latest addition 1 88-325is red - parts
latest addition 1 89-325i vert - white -fixin/sold
latest addition 1 92-318i vert - blue - parts
latest addition 1 87 325is blk - parts.

latest addition as of 2013-Gold 87-325is auto! it's a keeper!
Ceeker is offline   Reply With Quote
Old 08-25-2013, 09:19 PM   #3
LVP
2nd Gear Member
 
Join Date: Dec 2004
Location: Hamilton
Posts: 161
I tried that without success. I think I got maybe some small bubbles out, but hard to tell. Pumped about a litre through the 4 lines total.
LVP is offline   Reply With Quote
Old 08-25-2013, 10:10 PM   #4
Ceeker
Parts hoarding partner...
 
Ceeker's Avatar
 
Join Date: Nov 2007
Location: Toronto
Posts: 3,363
what about disconnecting the power to the abs unit?
__________________

I think I've had 14 bmw's in 4 years.
2 IX's -sold and parts
2 325i 4 dr - sold
4 318is all white - sold and parts
1 87 325is red - parts
1 89 325i vert grey - parts
1 90 325is white - keepin
1 87 325i vert -red - keepin
latest addition 1 88-325is red - parts
latest addition 1 89-325i vert - white -fixin/sold
latest addition 1 92-318i vert - blue - parts
latest addition 1 87 325is blk - parts.

latest addition as of 2013-Gold 87-325is auto! it's a keeper!
Ceeker is offline   Reply With Quote
Old 08-26-2013, 05:55 PM   #5
LVP
2nd Gear Member
 
Join Date: Dec 2004
Location: Hamilton
Posts: 161
The mush is there with the car on or off, so whether the ABS is powered or not makes no difference. At rest with the car off, the pedal is still long/soft. Makes for an awkward heel/toe at the track. There is no booster (I removed it a while back to see if that was part of the problem - it wasn't)
LVP is offline   Reply With Quote
Old 08-26-2013, 08:48 PM   #6
dcramer
5th Gear Member
 
Join Date: Nov 2010
Location: Orangeville
Posts: 1,109
do you have stainless lines ? If not try pinching off all of the brake lines in front of the calipers. If that works then take them off one by one.

If you can't do that then can it be pumped up firm ?

When my pedal was long it firmed up with the car off.

if it is bad on or off I'd seriously start looking at the master cylinder
__________________
dcramer is offline   Reply With Quote
Old 08-27-2013, 09:30 AM   #7
Cracky
1st Gear Newbie
 
Join Date: Oct 2006
Location: gta
Posts: 8
soft brake pedal is pretty common annoyance. nothing more.
Cracky is offline   Reply With Quote
Old 08-27-2013, 09:33 AM   #8
dcramer
5th Gear Member
 
Join Date: Nov 2010
Location: Orangeville
Posts: 1,109
Well if it is soft with the engine off I would be worried
__________________
dcramer is offline   Reply With Quote
Old 08-27-2013, 10:18 AM   #9
Ceeker
Parts hoarding partner...
 
Ceeker's Avatar
 
Join Date: Nov 2007
Location: Toronto
Posts: 3,363
well something isn't creating pressure if the pedal is soft after a few pumps with the car off. I'd say it is mechanical then as mentioned - probably master cyl.

question is; how would air get into the abs system to begin with unless the lines were disconnected at the pump? just seems like excessive air in the lines and I can't fathom after bleeding numerous times that you'd still have such a soft pedal.
__________________

I think I've had 14 bmw's in 4 years.
2 IX's -sold and parts
2 325i 4 dr - sold
4 318is all white - sold and parts
1 87 325is red - parts
1 89 325i vert grey - parts
1 90 325is white - keepin
1 87 325i vert -red - keepin
latest addition 1 88-325is red - parts
latest addition 1 89-325i vert - white -fixin/sold
latest addition 1 92-318i vert - blue - parts
latest addition 1 87 325is blk - parts.

latest addition as of 2013-Gold 87-325is auto! it's a keeper!
Ceeker is offline   Reply With Quote
Reply

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

Forum Jump


All times are GMT -4. The time now is 12:07 PM.


Powered by vBulletin® Version 3.8.1
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.