BMW M3 Forum (E90 E92)

BMW Garage BMW Meets Register Search Today's Posts Mark Forums Read


Go Back   M3Post - BMW M3 Forum > E90/E92 M3 Technical Topics > Suspension | Brakes | Chassis
 
Stick to Clutch
Post Reply
 
Thread Tools Search this Thread
      04-24-2013, 01:52 PM   #1
lockeed
Private First Class
 
lockeed's Avatar
 
Drives: 08 E90 6MT Alpine
Join Date: Mar 2013
Location: Quebec

Posts: 175
iTrader: (0)

Brake wear measurement

Just purchased my E90 about 3 weeks ago... Dealer performed a pre delivery inspection and found the rear brake pads to be at 9mm - which they say is well within limits for the car to be certified.

I just put my 19s on last week and my technician (non BMW) noticed that I had aprox 1/16" of rear brake pads left before getting to the warning probe.

I made 1700km since taking possession of the car. Could the rear pads have faded that quickly during very normal driving? Or does it mean that the tech who did the "certified" inspection screw up on his measurement?
__________________
___________________________________
08' M3 Sedan 6MT // Alpine on Black Novillo
lockeed is offline  
0
Reply With Quote
      04-24-2013, 02:01 PM   #2
jphughan
Brigadier General
 
jphughan's Avatar
 
Drives: 2011.75 M3 E92 6MT
Join Date: Mar 2011
Location: Austin, TX

Posts: 3,290
iTrader: (0)

Maybe they're not looking at the same pads? It's pretty common for quicker inspections to only check the outer brake pads rather than the inner ones, which don't always wear quite evenly. I'm also not sure what the thickness threshold is for the wear sensor to be tripped. But to answer your question, no 1700 km of normal driving shouldn't have produced any noticeable wear even on the fronts, certainly not the rears. Rear pads should last probably 35-45K road miles, if not more.
__________________
11 M3 E92 Le Mans | Black Nov w/ Alum | 6MT | Premium 2 | Convenience | 19" | EDC | Prem Audio | Moonroof | BMW Apps | Vorshlag Adjustable Camber Plates | StopTech ST-60 380mm BBK | Castrol SRF Fluid | ModMyNav.com rear camera | OEM Euro Sunglasses Holder
jphughan is offline   United_States
0
Reply With Quote
      04-24-2013, 02:02 PM   #3
ms372
White Shark
 
ms372's Avatar
 
Drives: AW E92 m3 6MT
Join Date: Mar 2012
Location: Montreal

Posts: 905
iTrader: (0)

go into your iDrive under info, you should find how much is left in your breaks before the warning comes on.
__________________
ESS | Challenge x-pipe | Akrapovic | Stoptech BBK (380/355) |Ohlins R&T | Dinan | Vorsteiner | Downforce USA | Varis Diffuser | Gintani | UUC | BMW Performance | Macht Schnell | Forgestar F14's SDC 19x9.5F 19x11R | 255.35 295.30

ms372 is online now   Canada
0
Reply With Quote
      04-24-2013, 02:06 PM   #4
jphughan
Brigadier General
 
jphughan's Avatar
 
Drives: 2011.75 M3 E92 6MT
Join Date: Mar 2011
Location: Austin, TX

Posts: 3,290
iTrader: (0)

Quote:
Originally Posted by ms372 View Post
go into your iDrive under info, you should find how much is left in your breaks before the warning comes on.
That's only an estimate. The wear sensor doesn't provide actual thickness measurements, it's just a wire that runs into the pad material so that eventually it's exposed from wearing enough pad material away, at which point it touches the rotor, which completes an electrical circuit and triggers the pad replacement warning. But until that happens, remaining mileage is just a guess.
__________________
11 M3 E92 Le Mans | Black Nov w/ Alum | 6MT | Premium 2 | Convenience | 19" | EDC | Prem Audio | Moonroof | BMW Apps | Vorshlag Adjustable Camber Plates | StopTech ST-60 380mm BBK | Castrol SRF Fluid | ModMyNav.com rear camera | OEM Euro Sunglasses Holder
jphughan is offline   United_States
0
Reply With Quote
      04-24-2013, 02:08 PM   #5
FVM3
Major General
 
FVM3's Avatar
 
Drives: e92 m3, f30 328i
Join Date: Sep 2010
Location: Los Angeles

Posts: 5,711
iTrader: (2)

probably different pads. Replace them asap
FVM3 is offline  
0
Reply With Quote
      04-24-2013, 02:17 PM   #6
Mr. ///M3 RD
Major General
 
Mr. ///M3 RD's Avatar
 
Drives: E350 & 280 SL on Weekends :)
Join Date: May 2010
Location: GTA, Ontario - Canada

Posts: 7,863
iTrader: (0)

Garage List
Quote:
Originally Posted by lockeed View Post
Just purchased my E90 about 3 weeks ago... Dealer performed a pre delivery inspection and found the rear brake pads to be at 9mm - which they say is well within limits for the car to be certified.

I just put my 19s on last week and my technician (non BMW) noticed that I had aprox 1/16" of rear brake pads left before getting to the warning probe.

I made 1700km since taking possession of the car. Could the rear pads have faded that quickly during very normal driving? Or does it mean that the tech who did the "certified" inspection screw up on his measurement?
If you can I would return to the same place and speak to the Maintenance Department Manager.

You purchased a certified car ... get what you paid for ... insist upon it would be my advice.

Good Luck!
__________________
Cheers, Rolf-Dieter

Life will take us to some interesting places, fortunately The ///M3 will too with a many of us know this very well
---> Click here for some good stuff I found
Mr. ///M3 RD is offline   Canada
0
Reply With Quote
      04-24-2013, 02:32 PM   #7
1MOREMOD
2014 Track Days - 9|Ridge 1:52:25|Pacific 1:35:72
 
1MOREMOD's Avatar
 
Drives: Race car->
Join Date: Mar 2009
Location: check your mirrors

Posts: 11,889
iTrader: (5)

No way would you see that much use in that short of time. 9mm is almost full thickness. Think they start at around 10 and you can run to about 2-3mm before you break the sensor wire.
1MOREMOD is offline   United_States
0
Reply With Quote
      04-24-2013, 03:08 PM   #8
lockeed
Private First Class
 
lockeed's Avatar
 
Drives: 08 E90 6MT Alpine
Join Date: Mar 2013
Location: Quebec

Posts: 175
iTrader: (0)

Weird indeed... I'll inspect the pads myself and see... In the mean time, I've been denied a set of pads from the dealer... (I'm 700km away from them).
__________________
___________________________________
08' M3 Sedan 6MT // Alpine on Black Novillo
lockeed is offline  
0
Reply With Quote
      04-24-2013, 03:18 PM   #9
1MOREMOD
2014 Track Days - 9|Ridge 1:52:25|Pacific 1:35:72
 
1MOREMOD's Avatar
 
Drives: Race car->
Join Date: Mar 2009
Location: check your mirrors

Posts: 11,889
iTrader: (5)

That's lame. At least they are cheap. Last time I checked turner has oem rears for 75.
1MOREMOD is offline   United_States
0
Reply With Quote
      04-24-2013, 03:33 PM   #10
lockeed
Private First Class
 
lockeed's Avatar
 
Drives: 08 E90 6MT Alpine
Join Date: Mar 2013
Location: Quebec

Posts: 175
iTrader: (0)

I'll put a listing in the classified section for some rear brake pads!
__________________
___________________________________
08' M3 Sedan 6MT // Alpine on Black Novillo
lockeed is offline  
0
Reply With Quote
      04-24-2013, 04:04 PM   #11
1MOREMOD
2014 Track Days - 9|Ridge 1:52:25|Pacific 1:35:72
 
1MOREMOD's Avatar
 
Drives: Race car->
Join Date: Mar 2009
Location: check your mirrors

Posts: 11,889
iTrader: (5)

Quote:
Originally Posted by lockeed View Post
I'll put a listing in the classified section for some rear brake pads!
Try calling cicle bmw in NJ. I've used them for oem parts and usually pretty cheap. Or winslow bmw in denver.
1MOREMOD is offline   United_States
0
Reply With Quote
      04-24-2013, 04:16 PM   #12
lockeed
Private First Class
 
lockeed's Avatar
 
Drives: 08 E90 6MT Alpine
Join Date: Mar 2013
Location: Quebec

Posts: 175
iTrader: (0)

I'm in Quebec - there's gona be a ton of import fees and taxes just on shipping... Not really an option unless the price is ridiculous...
__________________
___________________________________
08' M3 Sedan 6MT // Alpine on Black Novillo
lockeed is offline  
0
Reply With Quote
      04-24-2013, 09:49 PM   #13
lockeed
Private First Class
 
lockeed's Avatar
 
Drives: 08 E90 6MT Alpine
Join Date: Mar 2013
Location: Quebec

Posts: 175
iTrader: (0)

I'm wondering, do I need to replace the brake pad sensor while putting new pads at the rear?
__________________
___________________________________
08' M3 Sedan 6MT // Alpine on Black Novillo
lockeed is offline  
0
Reply With Quote
      04-24-2013, 10:56 PM   #14
1MOREMOD
2014 Track Days - 9|Ridge 1:52:25|Pacific 1:35:72
 
1MOREMOD's Avatar
 
Drives: Race car->
Join Date: Mar 2009
Location: check your mirrors

Posts: 11,889
iTrader: (5)

Quote:
Originally Posted by lockeed View Post
I'm wondering, do I need to replace the brake pad sensor while putting new pads at the rear?
no only if it has worn thru which isnt likely.
__________________

02 Tiag e46 M3|6MT|GC plates|MCS c.o.|GC bars|GC race control arms|GC bushings & bearings|BW eng. & tran. mounts|subframe kit|BW race shifter|BW Jaffster|Euro header|BW race|K&N c.a.i.|Epic race tune|Rouge pulleys|Seibon CF hood|CSL bumper|ST-40|XR-2|SS lines|half cage|Recaro profi|Profi 2 harness|BMWpedals|BW studs|
1MOREMOD is offline   United_States
0
Reply With Quote
      04-25-2013, 08:08 AM   #15
lockeed
Private First Class
 
lockeed's Avatar
 
Drives: 08 E90 6MT Alpine
Join Date: Mar 2013
Location: Quebec

Posts: 175
iTrader: (0)

Thx for the answer
__________________
___________________________________
08' M3 Sedan 6MT // Alpine on Black Novillo
lockeed is offline  
0
Reply With Quote
Post Reply

Bookmarks

Thread Tools Search this Thread
Search this Thread:

Advanced Search

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
Forum Jump


All times are GMT -5. The time now is 11:01 AM.




m3post
Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
1Addicts.com, BIMMERPOST.com, E90Post.com, F30Post.com, M3Post.com, ZPost.com, 5Post.com, 6Post.com, 7Post.com, XBimmers.com logo and trademark are properties of BIMMERPOST