Front Range 4x4 Upcoming Trail Runs - Add a New Trail Run

Results 1 to 18 of 18

Thread: How can a brake pad fail like this?

  1. #1
    Join Date
    Sep 2017
    Member
    #2036
    Last Online
    5 Hours Ago
    Location
    Broomfield
    4x4
    2005 Wrangler Unlimited (LJ)
    Posts
    1,082
    User Name
    open_circuit
    Real Name
    Trent
    Thanks Given
    387
    Thanked 367 Times in 231 Posts

    Default How can a brake pad fail like this?



    While running an errand this morning, my wife heard a terrible sound from the rear passenger tire on her van. She said she thought the wheel was falling off. She brought the van home where I pulled the rear tire and brake caliper and had a look. The inboard brake pad on the rear passenger tire was worn down completely and had worked itself out of the seating / guide slides. Her van only has 47k miles and these are original brake pads from when we bought the van new off the lot. The other brake pad from the same caliper is about half worn, as were both pads on the rear driver wheel. I replaced all of the rear pads today, and inspected the fronts. The fronts were all worn evenly and have about 40-50% remaining, so I did not yet replace them.

    I am concerned about how a single pad in a caliper can wear completely down like this while the opposite pad does not. The pad that caused the problem is the pad that the piston pushes on.

    Any ideas? Is there something else I should be checking for or replacing that I didn't notice? Upon seeing the pad, I thought I would have to replace the rotor also, but the rotor doesn't seem obviously badly scored or warped, so I'm thinking I'll just leave it.

    Right now my best guess is that the worn pad was defective and a big chunk of it disintegrated suddenly at some point. All other theories I can think of involving something sticking in the caliper bring me back around to "if the caliper wasn't moving correctly, why is the mating pad worn about halfway instead of not worn at all or worn all the way down?"

    Photos below show all 4 rear pads. The pads with the springs on top are the inboard pads. Ignore the weird circle on the bad pad -- that is from the C clamp I used to try to compress the piston. I used the bad pad as a load spreader.






  2. #2
    Join Date
    Apr 2017
    Member
    #1973
    Last Online
    15 Hours Ago
    Location
    Allenspark / Peak-to-Peak Highway
    4x4
    2005 Jeep Rubicon, 2018 Ram Power Wagon
    Posts
    1,558
    User Name
    RockyMtRebel
    Real Name
    Matt
    Thanks Given
    227
    Thanked 534 Times in 323 Posts

    Default Re: How can a brake pad fail like this?



    The caliper might be shot, happened to my Jeep. In my case after pressing the brake pedal and letting go the piston was not retracting as it should. If your wife’s brakes have multiple pistons on the caliper maybe one of them is not doing it’s job causing the pad to wear in that spot
    ___________
    2005 Jeep Wrangler Rubicon 6speed
    ~Built for wheelin'

  3. The Following Member Says Thanks to RockyMtRebel For This Post:

    open_circuit (2 Weeks Ago)

  4. #3
    Join Date
    Sep 2017
    Member
    #2036
    Last Online
    5 Hours Ago
    Location
    Broomfield
    4x4
    2005 Wrangler Unlimited (LJ)
    Posts
    1,082
    User Name
    open_circuit
    Real Name
    Trent
    Thanks Given
    387
    Thanked 367 Times in 231 Posts

    Default Re: How can a brake pad fail like this?



    Just one big piston

    It retracted ok with the tool. Couldn't compress with a c clamp because this type of piston needs to be rotated while it is compressed. Had to rent the tool with matching die from the FLAPS

  5. #4
    Join Date
    Mar 2012
    Member
    #1028
    Last Online
    5 Hours Ago
    Location
    Longmont
    Age
    68
    4x4
    '12 Jeep Wrangler Sport 2.5" lift, 33s, winch
    Posts
    3,898
    User Name
    Tom
    Real Name
    Tom
    Thanks Given
    1,430
    Thanked 783 Times in 575 Posts

    Default Re: How can a brake pad fail like this?



    I had an F150 and that same thing happened on the front passenger. Since I had done the brake job I assumed I did not seat the pads in the bracket correctly. I figured they weren't seated and wore because they were constantly rubbing. You've made me second guess that now.

    Have the pads been replaced previously?
    ___________
    Tom
    -.- . ——- .— - -.-

    Life is just better in 4-Low!

    https://m.youtube.com/user/wcrosman/videos

  6. The Following Member Says Thanks to Tom For This Post:

    open_circuit (2 Weeks Ago)

  7. #5
    Join Date
    Sep 2017
    Member
    #2036
    Last Online
    5 Hours Ago
    Location
    Broomfield
    4x4
    2005 Wrangler Unlimited (LJ)
    Posts
    1,082
    User Name
    open_circuit
    Real Name
    Trent
    Thanks Given
    387
    Thanked 367 Times in 231 Posts

    Default Re: How can a brake pad fail like this?



    No. These pads are the originals from the factory. We bought the van new and have been the only owners. Basically it has just had oil changes, wipers, and new tires since we bought it

  8. #6
    Join Date
    May 2011
    Member
    #834
    Last Online
    7 Hours Ago
    Location
    Colorado Springs
    4x4
    2004 Jeep Wrangler LJ
    Posts
    1,042
    User Name
    Brian
    Real Name
    Brian
    Thanks Given
    595
    Thanked 315 Times in 225 Posts

    Default Re: How can a brake pad fail like this?



    I would venture a guess that the pad became unbonded suddenly rather than being rapidly consumed, and was ejected from the brake assembly. In the pics of the bad pad there seems to be a shiny or scuffed area on the metal plate along the missing pad. Might be from the pad exiting the steel plate intact. Also I would think wearing through an entire pad would leave the rotor, at least on that side, with some level of uneven wear. Just my CSI .02

  9. The Following Member Says Thanks to Brian For This Post:

    open_circuit (2 Weeks Ago)

  10. #7
    Join Date
    Sep 2017
    Member
    #2036
    Last Online
    5 Hours Ago
    Location
    Broomfield
    4x4
    2005 Wrangler Unlimited (LJ)
    Posts
    1,082
    User Name
    open_circuit
    Real Name
    Trent
    Thanks Given
    387
    Thanked 367 Times in 231 Posts

    Default Re: How can a brake pad fail like this?



    I agree about the rotor. It's hard to see the backside and I didn't remove it yet today. I'll pull it back off Saturday when I have more time. Probably will end up replacing it.

  11. #8
    Join Date
    Apr 2009
    Member
    #405
    Last Online
    2 Days Ago
    Location
    Golden, CO
    4x4
    1990 Cherokee
    Posts
    4,734
    User Name
    Hypoid
    Real Name
    Mike
    Thanks Given
    74
    Thanked 491 Times in 422 Posts

    Default Re: How can a brake pad fail like this?



    open_circuit previously posted:
    "Her van only has 47k miles and these are original brake pads from when we bought the van new off the lot."

    Is this not covered by warranty?

    Year/make/model might be useful.
    ___________
    The Lost Boys motto: We don't know where we're going, but we'll be there for awhile. :)

  12. The Following Member Says Thanks to Hypoid For This Post:

    open_circuit (2 Weeks Ago)

  13. #9
    Join Date
    Apr 2009
    Member
    #405
    Last Online
    2 Days Ago
    Location
    Golden, CO
    4x4
    1990 Cherokee
    Posts
    4,734
    User Name
    Hypoid
    Real Name
    Mike
    Thanks Given
    74
    Thanked 491 Times in 422 Posts

    Default Re: How can a brake pad fail like this?



    open_circuit previously posted:
    "All other theories I can think of involving something sticking in the caliper bring me back around to "if the caliper wasn't moving correctly, why is the mating pad worn about halfway instead of not worn at all or worn all the way down?""

    That, actually, is common wear for a "sticking" caliper.
    ___________
    The Lost Boys motto: We don't know where we're going, but we'll be there for awhile. :)

  14. The Following Member Says Thanks to Hypoid For This Post:

    open_circuit (2 Weeks Ago)

  15. #10
    Join Date
    Jul 2014
    Member
    #1546
    Last Online
    6 Hours Ago
    Location
    Denver, CO
    Age
    42
    4x4
    1970CJ5-1958WillysWagon-2010Tacoma
    Posts
    2,669
    User Name
    FINOCJ
    Real Name
    James Orofino
    Thanks Given
    802
    Thanked 1,000 Times in 611 Posts

    Default Re: How can a brake pad fail like this?



    My first thought was sticky caliper piston as well, but when I looked again on the large screen at home, I am kind of thinking Brian might be on to something: Can you tell if it looks like the pad unbonded from the backing material? Might just be a failure of that single pad....not good, but maybe better than a complete overhaul of the caliper etc.
    ___________
    James Orofino
    1970 CJ5
    1958 Willys Wagon
    2010 Tacoma TRD

  16. The Following Member Says Thanks to FINOCJ For This Post:

    open_circuit (2 Weeks Ago)

  17. #11
    Join Date
    Sep 2017
    Member
    #2036
    Last Online
    5 Hours Ago
    Location
    Broomfield
    4x4
    2005 Wrangler Unlimited (LJ)
    Posts
    1,082
    User Name
    open_circuit
    Real Name
    Trent
    Thanks Given
    387
    Thanked 367 Times in 231 Posts

    Default Re: How can a brake pad fail like this?



    Hypoid previously posted:
    "Is this not covered by warranty?

    Year/make/model might be useful."

    2014 Mazda 5. I assume it is too old to be under warranty for this.

  18. #12
    Join Date
    Sep 2017
    Member
    #2036
    Last Online
    5 Hours Ago
    Location
    Broomfield
    4x4
    2005 Wrangler Unlimited (LJ)
    Posts
    1,082
    User Name
    open_circuit
    Real Name
    Trent
    Thanks Given
    387
    Thanked 367 Times in 231 Posts

    Default Re: How can a brake pad fail like this?



    FINOCJ previously posted:
    "My first thought was sticky caliper piston as well, but when I looked again on the large screen at home, I am kind of thinking Brian might be on to something: Can you tell if it looks like the pad unbonded from the backing material? Might just be a failure of that single pad....not good, but maybe better than a complete overhaul of the caliper etc."

    I wondered the same. It looks like there is a tiny bit of brake material left on the backer and it wore more in the back than the front. I might be interpreting what I am seeing wrong, but it looks like if the pad unbonded, it sheared a section off because what is left on the backer is textured and not completely flat.

  19. The Following Member Says Thanks to open_circuit For This Post:

    FINOCJ (2 Weeks Ago)

  20. #13
    Join Date
    Jun 2011
    Member
    #853
    Last Online
    22 Hours Ago
    Location
    Denver
    4x4
    LJ, Xterra
    Posts
    6,292
    User Name
    Paul
    Real Name
    Paul
    Thanks Given
    1,565
    Thanked 1,322 Times in 923 Posts

    Default Re: How can a brake pad fail like this?



    Wow, glad nothing bad happened from it! I think Brian nailed it, looks like just a defective pad. Having said that, if that was my wife's car I'd replace the caliper too just for my peace of mind.

  21. The Following Member Says Thanks to Paul For This Post:

    open_circuit (2 Weeks Ago)

  22. #14
    Join Date
    Sep 2017
    Member
    #2036
    Last Online
    5 Hours Ago
    Location
    Broomfield
    4x4
    2005 Wrangler Unlimited (LJ)
    Posts
    1,082
    User Name
    open_circuit
    Real Name
    Trent
    Thanks Given
    387
    Thanked 367 Times in 231 Posts

    Default Re: How can a brake pad fail like this?



    Paul previously posted:
    "Wow, glad nothing bad happened from it! I think Brian nailed it, looks like just a defective pad. Having said that, if that was my wife's car I'd replace the caliper too just for my peace of mind."

    The calipers appear to be cheap ($40 or less), so I'm leaning towards just replacing the one caliper. I have a rotor on the way in the mail as well.

    I haven't replaced a caliper before, but it seems like I'd just need to clamp the hydraulic line (vice grips?), disconnect the old caliper, connect the new one, and then unclamp the line, then bleed that brake line and top off fluid if needed? I shouldn't lose very much brake fluid in the process this way, and the risk of introducing air into the line should be low?

  23. #15
    Join Date
    Sep 2014
    Member
    #1596
    Last Online
    5 Hours Ago
    Location
    Timnath
    4x4
    2012 Rock Ware Buggy & 2007 JKUR
    Posts
    1,283
    User Name
    newracer
    Real Name
    Michael
    Thanks Given
    129
    Thanked 485 Times in 310 Posts

    Default Re: How can a brake pad fail like this?



    I vote for sticking caliper. You don't need to clamp the brake line, you won't lose much fluid. Plus since the vehicle is 6 years old I'd at least partially flush the system anyways.

  24. The Following Member Says Thanks to newracer For This Post:

    open_circuit (2 Weeks Ago)

  25. #16
    Join Date
    Apr 2017
    Member
    #1973
    Last Online
    15 Hours Ago
    Location
    Allenspark / Peak-to-Peak Highway
    4x4
    2005 Jeep Rubicon, 2018 Ram Power Wagon
    Posts
    1,558
    User Name
    RockyMtRebel
    Real Name
    Matt
    Thanks Given
    227
    Thanked 534 Times in 323 Posts

    Default Re: How can a brake pad fail like this?



    Correct, you don't need to clamp the line... you just unbolt the caliper and have it ready to remove and then unscrew the brake line from hard line (usually 12" or less from caliper) and move quickly to minimize the mess (but there will be some dripping of fluid obviously). Screw new calipers brake line into the main brake line (dripping will stop) and then bolt up the caliper. It's actually very easy job, did mine last year for the first time. Obviously you will then have to bleed your brakes.... I choose to gravity bleed because its easy as pie and really the best way to get all the air out, just takes an hour or so of time.
    ___________
    2005 Jeep Wrangler Rubicon 6speed
    ~Built for wheelin'

  26. The Following Member Says Thanks to RockyMtRebel For This Post:

    open_circuit (2 Weeks Ago)

  27. #17
    Join Date
    Sep 2017
    Member
    #2036
    Last Online
    5 Hours Ago
    Location
    Broomfield
    4x4
    2005 Wrangler Unlimited (LJ)
    Posts
    1,082
    User Name
    open_circuit
    Real Name
    Trent
    Thanks Given
    387
    Thanked 367 Times in 231 Posts

    Default Re: How can a brake pad fail like this?



    RockyMtRebel previously posted:
    "Correct, you don't need to clamp the line... you just unbolt the caliper and have it ready to remove and then unscrew the brake line from hard line (usually 12" or less from caliper) and move quickly to minimize the mess (but there will be some dripping of fluid obviously). Screw new calipers brake line into the main brake line (dripping will stop) and then bolt up the caliper. It's actually very easy job, did mine last year for the first time. Obviously you will then have to bleed your brakes.... I choose to gravity bleed because its easy as pie and really the best way to get all the air out, just takes an hour or so of time."

    I have a self-bleed kit that makes it pretty easy to bleed by pumping the brakes. (https://www.amazon.com/Genesis-Perso..._rd_i=15707321). It's just a bottle with a magnet glued to it and a length of flexible tubing to attach to the bleeder screw. Seems to have worked well on my Jeep and Subaru (though there are many more good places to stick the magnet on the Jeep!)

  28. #18
    Join Date
    Sep 2014
    Member
    #1596
    Last Online
    5 Hours Ago
    Location
    Timnath
    4x4
    2012 Rock Ware Buggy & 2007 JKUR
    Posts
    1,283
    User Name
    newracer
    Real Name
    Michael
    Thanks Given
    129
    Thanked 485 Times in 310 Posts

    Default Re: How can a brake pad fail like this?



    I put Speed Bleeders on all my vehicles to make bleeding extremely easy.

Similar Threads

  1. Moab Fail
    By Paul in forum 3) Trail Run Reports
    Replies: 21
    Last Post: April 22nd, 2012, 03:01 AM
  2. facebook add fail
    By scout man in forum General Topics
    Replies: 9
    Last Post: March 25th, 2012, 09:29 PM
  3. Ski Fail Staples
    By Paul in forum Chat
    Replies: 8
    Last Post: March 2nd, 2012, 07:48 AM
  4. Replies: 0
    Last Post: January 4th, 2012, 07:42 AM
  5. FAIL
    By WINKY in forum Chat
    Replies: 1
    Last Post: May 7th, 2009, 06:04 PM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
BACK TO TOP