Home Forums Articles How To's FAQ Register
Go Back   Xoutpost.com > BMW SAV Forums > X5 (E70) Forum
Details Domain
User Name
Password
Member List Premier Membership Search Today's Posts Mark Forums Read


Reply
 
LinkBack Thread Tools Display Modes
  #1  
Old 09-27-2012, 01:55 PM
Member
 
Join Date: Jan 2012
Location: Altos del Maria, Panama
Posts: 13
Stantiva is on a distinguished road
Question Front Brake Sensor temporary bypass

I replaced the front pads before the sensor was activated. Unfortunately the sensor was unwilling to be removed easily and as a result I snapped it. Apparently the service reset procedure will not work when the sensor is defective. I have ordered a replacement, but it will be months before I get it since I live in the interior of Panama. The dealer is a 2 hour drive and nothing happens unless I leave the car for a day. I have tried unsuccessfully to determine with an ohm meter if any of the 3 wires in the end piece are looped so I could temporarily by pass the sensor. Any suggestions regarding how to reset the service nag? The algorithm now tells me I must have the pads replaced. TIA.
BTW, the low dust pads I purchased from NewTek seem to live up to their promise.
Reply With Quote

Sponsored Links

  #2  
Old 09-27-2012, 11:10 PM
TerminatorX5's Avatar
Premier Member
 
Join Date: Jul 2006
Location: Stafford, VA & Harrisburg, PA - USA
Posts: 5,559
TerminatorX5 is on a distinguished road
front brake pad wear sensor (as well as rear sensor) has only 2 wires which is one pair. when those two wires are shorted to each other, the system will think that the brake pad indicator is functional - when the pads wear too thin, the rolling rotor cuts through the metal of the sensor and thus interrupts the integrity of the connection...

You mentioned THREE wires - not sure which ones you are talking about...

when i buy pads, i also buy the sensors to go along with them, it is much easier, even if the original sensor is still good, you just replace it along with the new pads... not sure how much it is in Panama, but sensors cvan be had for under $10... I don't think you can get them at the Colon though, or at Albrooks mall... mail-in orders only...

I had a tire blow out once in Panama, and it was hard to find a tire in 20" for my X5 - but I was lucky and found one...
Attached Images
 
__________________
E53 X5 4.6iS
147K mi - Sold May 2013
Tireprints left in:
USA, Nicaragua, Costa Rica, Panama, Russia

E53 X5 4.8iS built 2005-10-17
66200 mi - June 2012
96000 mi - June 2013
112000 mi - June 2014
OEM fire extinguisher
OE first aid kit
OE tow hitch
OE TV module
OE aspheric mirror
K&N air filter
black/white badges
rear camera
4-channel video recorder

Here is the list of things I have done to the X
Reply With Quote
  #3  
Old 09-30-2012, 12:25 PM
Member
 
Join Date: Jan 2012
Location: Altos del Maria, Panama
Posts: 13
Stantiva is on a distinguished road
Thank You Terminator, I was looking at the broken piece of sensor which does have 3 conductors. Looking closely now it appears that I did burn through as I see the three bits of copper on the wear surface. 2 have continuity one does not. Regardless, I will cut the cable and join the 2 wires to get rid of the nag. I planned to change the pads BEFORE the sensor but my timing was off by a day. Panama is recently much better for getting stuff but I still avoid dealer costs when I can. The mountains are tough on brakes and tires.

Found a simple circuit schematic

https://wiki.bentleypublishers.com/d...W+5+Series+E60
Attached Images
 

Last edited by Stantiva; 09-30-2012 at 01:36 PM.
Reply With Quote
  #4  
Old 09-30-2012, 11:11 PM
JCL's Avatar
Premier Member
 
Join Date: Mar 2005
Location: Vancouver, Canada
Posts: 11,480
JCL will become famous soon enoughJCL will become famous soon enough
Quote:
Originally Posted by TerminatorX5 View Post
front brake pad wear sensor (as well as rear sensor) has only 2 wires which is one pair. when those two wires are shorted to each other, the system will think that the brake pad indicator is functional - when the pads wear too thin, the rolling rotor cuts through the metal of the sensor and thus interrupts the integrity of the connection...

You mentioned THREE wires - not sure which ones you are talking about....
E53 had 2 wires. E70 has three. First interrupted circuit is used to project pad life. Second is used to confirm it is getting close, similar to the E53.

OP: use the rear sensor, disconnected, to determine the resistance between each pair of pins. Duplicate that with your front sensor until you get a replacement. I posted a link previously here with the BMW tech literature description of the functionality of the new sensor. Good luck.
__________________
2007 X3 3.0si, 6 MT, Premium, White

Retired:
2008 535i, 6 MT, M Sport, Premium, Space Grey
2003 X5 3.0 Steptronic, Premium, Titanium Silver

2002 325xi 5 MT, Steel Grey
2004 Z4 3.0 Premium, Sport, SMG, Maldives Blue
Reply With Quote
  #5  
Old 10-06-2012, 11:54 AM
Member
 
Join Date: Jan 2012
Location: Altos del Maria, Panama
Posts: 13
Stantiva is on a distinguished road
Snipped off the broken sensor, joined the two (2) wires, reset the service nag and all is well. I will install the new sensor when I come back.
Reply With Quote
  #6  
Old 10-06-2012, 11:58 AM
TerminatorX5's Avatar
Premier Member
 
Join Date: Jul 2006
Location: Stafford, VA & Harrisburg, PA - USA
Posts: 5,559
TerminatorX5 is on a distinguished road
Excellent!!! glad it worked for themporary fix, make sure you get a replacement sensor soon enough, otherwise it will rather hard to fit it back onto a worn pad...

Reply With Quote
  #7  
Old 10-06-2012, 01:42 PM
kungpao's Avatar
Member
 
Join Date: Sep 2012
Location: North East USA
Posts: 104
kungpao is on a distinguished road
How many brake pad sensors are on the e70? My wife's 328xi only had sensors on the front driver side and rear passenger side. Didn't help me when the front passenger side went down to metal.
__________________
-kp!
2009 X5 35D
Reply With Quote
  #8  
Old 10-06-2012, 02:54 PM
1naztyx5's Avatar
Member
 
Join Date: Jul 2012
Location: PA
Posts: 385
1naztyx5 is on a distinguished road
Quote:
Originally Posted by kungpao View Post
How many brake pad sensors are on the e70? My wife's 328xi only had sensors on the front driver side and rear passenger side. Didn't help me when the front passenger side went down to metal.
E70 has two, front dvr side, rear pas side.
__________________
"This is My X5 there are many like it but this one is mine"
Reply With Quote
  #9  
Old 02-12-2013, 12:48 PM
Member
 
Join Date: Feb 2012
Location: Vancouver
Posts: 242
jlam86 is on a distinguished road
out of curiosity, what is the mileage remaining before the first stage is triggered? I want to change my pads before the warning goes off. I have 1700kms left to go according to the idrive.

Also, does anyone know the minimum thickness of the rotor before new ones are required. Thank you!
Reply With Quote
  #10  
Old 02-12-2013, 04:06 PM
JCL's Avatar
Premier Member
 
Join Date: Mar 2005
Location: Vancouver, Canada
Posts: 11,480
JCL will become famous soon enoughJCL will become famous soon enough
Quote:
Originally Posted by jlam86 View Post
out of curiosity, what is the mileage remaining before the first stage is triggered? I want to change my pads before the warning goes off. I have 1700kms left to go according to the idrive.

Also, does anyone know the minimum thickness of the rotor before new ones are required. Thank you!
I would almost guarantee you that you have worn through the first trigger step. It is a calibration trigger, for the CBS. If I was designing such a trigger, I would put it at about half life of the pads, on the assumption that the second half life would wear as quickly as the first half did.

Just buy the sensor, it isn't expensive. They also get brittle from the heat, so it is good practice to replace them in any case.
__________________
2007 X3 3.0si, 6 MT, Premium, White

Retired:
2008 535i, 6 MT, M Sport, Premium, Space Grey
2003 X5 3.0 Steptronic, Premium, Titanium Silver

2002 325xi 5 MT, Steel Grey
2004 Z4 3.0 Premium, Sport, SMG, Maldives Blue
Reply With Quote
Reply

Bookmarks

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 Off
Trackbacks are On
Pingbacks are On
Refbacks are On



I


All times are GMT -4. The time now is 01:50 PM.
vBulletin, Copyright 2014, Jelsoft Enterprises Ltd. Search Engine Friendly URLs by vBSEO 3.6.0
2013 Xoutpost.com. All rights reserved. Xoutpost.com is a private enthusiast site not associated with BMW AG.
The BMW name, marks, M stripe logo, and Roundel logo as well as X3, X5 and X6 designations used in the pages of this Web Site are the property of BMW AG.
This web site is not sponsored or affiliated in any way with BMW AG or any of its subsidiaries.