Welcome to Bimmerfest -- The #1 Online Community for BMW related information! Please enjoy the discussion forums below and share your experiences with the 200,000 current, new and past BMW owners. The forums are broken out by car model and into other special interest sections such as BMW European Delivery and a special forum to voice your questions to the many BMW dealers on the site to assist our members!

Please follow the links below to help get you started!

Go Back   Bimmerfest - BMW Forums > BMW Model Discussions > 3 Series / 4 Series > E30 (1982 - 1993)

E30 (1982 - 1993)
God's Chariot. The E30 was produced primarily from 1982 through 1991. The cabriolet was the one exception which was produced through 1993.

Reply
 
Thread Tools Display Modes
  #1  
Old 12-08-2011, 03:28 PM
Jbarrtndrsr Jbarrtndrsr is offline
Registered User
Location: NC
 
Join Date: Dec 2011
Posts: 5
Mein Auto: BMW 325ic
Question Brakes Issue.

Hi to all Bimmerfest members and thank you for these forums.

Initially, my brakes were going out. The pedal was sinking to the floor, and I was continuously having to pump the brakes to have it stop. (1)My first step was to replace the master cylinder and bleed the brakes. After completion, while I was driving the following day to school I noticed a heavy vibration. Soon after, me and my dad proceeded to step two. (2)Replacing the front calipers, rotors, and brake hoses (from calipers). After finishing up and bleeding the brakes, we noticed how difficult it was to turn the rotors. I have read several threads, but nothing that involved the use of new Girling calipers, which are not releasing from the rotor. We have been troubleshooting to find another culprit that would be causing the issue. My initial response would be possible Guide pins (since we lubricated them initially), possible bad caliper(s), possible metal brake line issue, brake booster problem (vacuum), or a brake proportioning valve (Brake pressure regulator?). After spending about 300$ so far, since I work at a carquest, I am still unable to troubleshoot the correct issue. Any help is appreciative.

I am beginning to feel like taking my issue to a mechanic may be an easier method. I am stretched low on cash due to gas, and college, etc. So anything that is DIY is great.
Reply With Quote
Advertisement
  #2  
Old 12-08-2011, 06:35 PM
downhiller's Avatar
downhiller downhiller is offline
livin large
Location: des moines
 
Join Date: Oct 2007
Posts: 7,294
Mein Auto: 2012 hypermotard 796
sounds like the booster to me. howd you bleed the brakes?
__________________
I know a lot about cars. I can look at a car's headlights and tell you exactly which way it's coming
Reply With Quote
  #3  
Old 12-08-2011, 09:25 PM
Jbarrtndrsr Jbarrtndrsr is offline
Registered User
Location: NC
 
Join Date: Dec 2011
Posts: 5
Mein Auto: BMW 325ic
Well, my car has ABS. I started at the master cylinder, bleeding all of the lines there. Then I did all of the line going into, and out of the ABS Module. Then I just did the normal rounds where I started at the rear right, the rear left, front right, then front left, while doing 12 pumps to attempt to bleed any extra air that may be trapped in the ABS (According to the BMW Manual). I noticed that the Brake Proportioning Valve has a single line running to it, but I did not attempt to bleed it.
Reply With Quote
  #4  
Old 12-10-2011, 06:04 PM
downhiller's Avatar
downhiller downhiller is offline
livin large
Location: des moines
 
Join Date: Oct 2007
Posts: 7,294
Mein Auto: 2012 hypermotard 796
i would first try to take out any leftover pressure in the lines, like do the corner to corner bleed just without the pumping. if it still happens, then i would go after the booster. i would upgrade it too since its gunna be out anyway
__________________
I know a lot about cars. I can look at a car's headlights and tell you exactly which way it's coming
Reply With Quote
  #5  
Old 12-11-2011, 05:52 PM
Jbarrtndrsr Jbarrtndrsr is offline
Registered User
Location: NC
 
Join Date: Dec 2011
Posts: 5
Mein Auto: BMW 325ic
I will see about doing this. I have decided to first off; replace the newly installed master cylinder since it is approximately where the issues first started. It is new, but I work in a parts store, and I know that parts can become defective from time to time. My logic is in that before I replaced anything my brakes were reaching the floor, and I was losing braking. Once I replaced the master cylinder the locking up of the calipers began. I will attempt a thorough bleeding this time around, even though we did a proper bench bleed. We did have to remove the reservoir during installation, perhaps causing air into the cylinder.
Reply With Quote
  #6  
Old 12-11-2011, 06:00 PM
downhiller's Avatar
downhiller downhiller is offline
livin large
Location: des moines
 
Join Date: Oct 2007
Posts: 7,294
Mein Auto: 2012 hypermotard 796
they wouldnt stick if air was in the lines. everytime i get air within my brake lines (bike) it doesnt have the clamping power like it should.
__________________
I know a lot about cars. I can look at a car's headlights and tell you exactly which way it's coming
Reply With Quote
  #7  
Old 12-12-2011, 04:08 PM
Jbarrtndrsr Jbarrtndrsr is offline
Registered User
Location: NC
 
Join Date: Dec 2011
Posts: 5
Mein Auto: BMW 325ic
I see what you are saying. Today I took off the master cylinder for replacement tomorrow morning, and as I was taking it off I noticed that the piston from the booster was coming out with it. I am not very experienced with brakes, but to me it seems like there may definitely be a brake booster issue, if the piston basically falls out of the booster. My dad is going to spend some time with it tomorrow to see if he can diagnose the issue with the booster. If I do replace it, it will more than likely be Friday before I can get the part. It is in Texas at the moment.
Reply With Quote
  #8  
Old 12-12-2011, 06:47 PM
downhiller's Avatar
downhiller downhiller is offline
livin large
Location: des moines
 
Join Date: Oct 2007
Posts: 7,294
Mein Auto: 2012 hypermotard 796
look at some of the m50 swaps. they used a different booster. itll be a nice little upgrade
__________________
I know a lot about cars. I can look at a car's headlights and tell you exactly which way it's coming
Reply With Quote
  #9  
Old 12-12-2011, 09:34 PM
Jbarrtndrsr Jbarrtndrsr is offline
Registered User
Location: NC
 
Join Date: Dec 2011
Posts: 5
Mein Auto: BMW 325ic
Not that I couldn't learn how to modify an e50 booster swap, but that may have to wait until I graduate and have a little more savings in the bank. I was looking at the treehouse swap and $329 dollars is a little hefty versus my $62 reman. I plan on doing a lot in the future, but that will have to wait in the mean time. Those M3 and M5 engine swaps sure do look appealing, as well as, the 540hp achievement. In time perhaps, I still have much to learn about BMWs.

By the way, Any information or links you could come up with would be appreciated.

Last edited by Jbarrtndrsr; 12-12-2011 at 09:38 PM. Reason: Removing unimportant information pertaining to the booster.
Reply With Quote
  #10  
Old 12-13-2011, 06:24 PM
downhiller's Avatar
downhiller downhiller is offline
livin large
Location: des moines
 
Join Date: Oct 2007
Posts: 7,294
Mein Auto: 2012 hypermotard 796
search for fcsteves bronzit ftl thread. he did the full swap plus some
__________________
I know a lot about cars. I can look at a car's headlights and tell you exactly which way it's coming
Reply With Quote
Reply

Bookmarks

Tags
brakes, caliper, pads, stuck


Forum Navigation
Go Back   Bimmerfest - BMW Forums > BMW Model Discussions > 3 Series / 4 Series > E30 (1982 - 1993)
Today's Posts Search
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



Forum Jump


All times are GMT -7. The time now is 09:01 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
© 2001-2011 performanceIX, Inc. All Rights Reserved .: guidelines .:. privacy .:. terms