E46 BMW Social Directory E46 FAQ 3-Series Discussion Forums BMW Photo Gallery BMW 3-Series Technical Information E46 Fanatics - The Ultimate BMW Resource BMW Vendors General E46 Forum The Tire Rack's Tire Wheel Forum Forced Induction Forum The Off-Topic The E46 BMW Showroom For Sale, For Trade or Wanting to Buy

Welcome to the E46Fanatics forums. E46Fanatics is the premiere website for BMW 3 series owners around the world with interactive forums, a geographical enthusiast directory, photo galleries, and technical information for BMW enthusiasts.

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!

If you have any problems with the registration process or your account login, please contact contact us.

Go Back   E46Fanatics > Tuning & Tech > Suspension & Braking Forum by BimmerWorld

Suspension & Braking Forum by BimmerWorld
Have some questions about suspension or brake setups for your E46 BMW? Get all your answers here!
Sponsored by BimmerWorld

Thread Tools Search this Thread Rate Thread Display Modes
Old 11-27-2012, 08:32 AM   #1
Registered User
Join Date: Sep 2012
Location: Georgia Peaches
Posts: 200
My Ride: Batmobile
Brake Master Cylinder Leaking... DSC On

When recently acquiring my current e46 the DSC light was on, it was one of those turn the car on and it turns on in a few seconds. Thought an alignment would fix it so planned on getting it done when it needed new tires. Now after I replaced all pads and rotors in the car I noticed that behind the pedal in the car there is brake fluid slowly leaking, after that in the drive way the car's brakes vibrated when slowly braking and now whenever the battery is connected some pump in the master cylinder (I believe) keeps working to the point that it drained my battery. I've read up on it and apparently the DSC system also detects when the pressure isn't right in the master cylinder so this might have been the DSC problem. Anywhoo, going to replace the master cylinder and check all relays and fuses. Any input is appreciated. Thanks!
328isawesome is offline   Reply With Quote
Ads by Google

Guests, get your FREE E46Fanatics.com membership to remove this ad.
Old 11-29-2012, 12:52 PM   #2
Registered User
Join Date: Sep 2012
Location: Georgia Peaches
Posts: 200
My Ride: Batmobile
Seriously, nobody has any input?
328isawesome is offline   Reply With Quote
Old 11-29-2012, 01:25 PM   #3
NC BMW fan
Registered User
Join Date: Jun 2012
Location: Charlotte, NC
Posts: 17
My Ride: 2003 325I
Sounds to me like a couple of things. 1) you have a leak in the master cylinder of some kind. It's troubling that you have brake fluid inside the car. That means its leaking into the brake booster, than into the car (see thread about brake booster).
2) there is no electrical connection to the master cylinder. That sounds like maybe an ABS module will not stop cycling.
Are you driving the car now? Do you have consistent firm pedal feel? The DSC light will come on if there is air in the system. leak=air.

I have a master cylinder if you are interested. $50. PM me, I'll send pics if you're interested.
NC BMW fan is offline   Reply With Quote

abs, brakes, dsc, master cylinder

Thread Tools Search this Thread
Search this Thread:

Advanced Search
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
Censor is ON

All times are GMT -5. The time now is 01:39 PM.

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2016, vBulletin Solutions, Inc.
(c) 1999 - 2016 performanceIX Inc - privacy policy - terms of use