What causes this level of uneven brake pad wear? - BMW Forum - BimmerWerkz.com
1,6,7,8 - Series and Mini Cooper General Chat related to models that do not fit into particular categories above. Please try to put your discussion in more appropriate sections. This section does cover the 1 Series, MINI Cooper and 8-Series vehicles: BMW 830i, BMW 840Ci, BMW 850i, BMW 850Ci, BMW 850CSi, M8, Alpina B12, BMW CS Concept and others.

LinkBack Thread Tools Display Modes
#1 (permalink) Old 02-20-2012, 06:02 AM
42, The meaning of life
brettski's Avatar
Join Date: Jul 2009
Location: Melbourne, Australia
Posts: 2,405
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
brettski is just really nice brettski is just really nice brettski is just really nice brettski is just really nice brettski is just really nice
(Thread Starter)
What causes this level of uneven brake pad wear?

Ok, so the story goes that about 12 months ago the front brake pads and rotors were replaced and I was told at the time that the rear pads needed to be changed pretty much immediately as well. About 5 weeks ago the Check Brake Linings alert came on and I figured that the rear pads had finally served their time and I'd left it a little too long. I ordered a full set of Hawk Ceramic pads, as well as front and rear wear sensors. When I pulled the rear pads off (3 weeks after the warning light came on) there was still a considerable amount of life left on them. Oh well, they are off now, I changed the pads over, and the sensor which had done its job. About two weeks later the brake pad warning came on again, so I figured maybe the front ones were due again. Pulled the front pads and noticed that yes the sensor was warn through, but the pad wear was very uneven, not just when comparing left wheel to right, but inside to outside on the left was noticeably different as well.
This first photo is the front left and right pads which isn't a great photo

The second photo is just the front left pads (inside is worn down), and I am assuming that when the pads were replaced, the sensor wasn't fully seated against the pad carrier, because I pushed the sensor back and it left at least another mm of pad material exposed.

So what causes pads to wear so unevenly between wheels and within a single calliper?

Riding in style
brettski is offline  
Sponsored Links
#2 (permalink) Old 02-20-2012, 10:31 AM
Join Date: Dec 2011
Posts: 49
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
rivroshaun951 is on a distinguished road
I am not a professional. This is just my opinion. I could be wrong.

Well the first obvious thing I see is that you did not mention anything about the condition of your rotors. If you did not machine your rotors then your pads are going to wear uneven from the beggining. Here is a list of possible causes.

#1. not machining your rotors after a pad slap.
#2. Warped rotors.
#3. to much wheel bearing endplay.
#4. Frozen brake caliper.
#5. Clogged brake line or a leaky caliper piston.

These are multiple reasons. But again since you did not mention anything about mating your rotors to the new pads. I would go with that first. Check the condition of your rotors. Don't just look at them. Do some measurements and compare them to spec.
rivroshaun951 is offline  
#3 (permalink) Old 02-20-2012, 02:39 PM
Captain... Savvy ?
Jack Dabsy's Avatar
Join Date: Apr 2011
Location: Barnsley UK
Posts: 2,194
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Jack Dabsy will become famous soon enough
... Caliper slide pins, these should be replaced relatively often as they stick too, especially if they're slightly bent !

Eso es todo!
Please press the "REP" button if you are happy with your response/answer...

Please JOIN, or just have a look... Its Totally FREE...
BMW Part Market

BMW Online Manuals (TIS)

New Member ?
Jack Dabsy is offline  
Sponsored Links

  BMW Forum - BimmerWerkz.com > BMW Model Specific Forums > 1,6,7,8 - Series and Mini Cooper

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
User Tag List

Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode

Similar Threads
Thread Thread Starter Forum Replies Last Post
brake pad wear reset Chel43 New Members Check In 1 03-27-2009 08:19 AM
Brake wear light Stud68 3-Series (E36) 7 01-02-2009 02:55 PM
Help!1 uneven rear tire wear on inside only, camber??? Rfitz25 3-Series (E21, E30) 18 10-29-2006 12:33 AM
Brake wear light still on...... mrjoshua 3-Series (E36) 4 06-03-2004 08:49 PM
Brake wear light IHATEMY328CI 3-Series (E46, E90) 18 02-06-2004 10:21 PM

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

For the best viewing experience please update your browser to Google Chrome