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Parking Brake Pad Separation

Discussion in 'Model S: Driving Dynamics' started by brantse, Mar 8, 2016.

  1. brantse

    brantse Member

    Joined:
    May 18, 2015
    Messages:
    398
    Location:
    Somerset, PA
    I've had an occasional, but pretty consistent metallic sound coming from my right, rear wheel for some time now. I actually believe it began the last time my car was at the service center, in which they replaced my brakes with the "cold weather" version. The sound was a very hollow, sheet metal type sound that would occur when hitting bumps. I thought it likely had something to do with the brake backing plate, but wasn't quite sure exactly what was causing it. Last night, when changing back over to my summer wheels, I found that the one parking brake pad lining had separated from it's backer and got stuck between the rotor and backing plate. I've seen this happen on conventional brake pads, but am very surprised that this happened on a parking brake. Not sure if the pad had got hung up at some point or if it wore after falling apart, but there wasn't a whole lot of it left.

    IMG_20160307_174843919.jpg IMG_20160307_174900372.jpg
     
  2. Tennisballer

    Tennisballer Member

    Joined:
    Feb 29, 2016
    Messages:
    28
    Location:
    Kennesaw, GA
    Are you sure it separated it looks like the slides may be rusted and caused it to get into a bind and wear that pad out. When they get rusted and the brake applies it is supposed to relax back after it is disengaged. This would cause the pad to wear prematurely. How many miles I am surprised your range has not fallen off looking at that.
     
  3. brantse

    brantse Member

    Joined:
    May 18, 2015
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    398
    Location:
    Somerset, PA
    The brake lining is sitting on top of the caliper in the second picture. It's hard to see, but you can see that the inside pad's metal backing is tight against the rotor. I'm also very surprised by this, especially considering that parking brakes are really only used at a stop. I agree that the slides look to be very corroded and likely aren't letting the pads slide very freely. You gotta love our NE winters :rolleyes:.

    The car has 35k miles and I haven't noticed any drop in range since I picked it up as a CPO at 24k.
     
  4. Tennisballer

    Tennisballer Member

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    Feb 29, 2016
    Messages:
    28
    Location:
    Kennesaw, GA
    That is strange I see now it's laying right there lol. That pad should literally last forever I would think because it's only used for parking like you said. It had to be defective.
     
  5. mspohr

    mspohr Active Member

    Joined:
    Jul 27, 2014
    Messages:
    1,791
    Location:
    California
    Looks like the pad is completely worn out to 0 thickness. You also have an amazing amount of corrosion of the pins which is probably the source of the problem. If the calipers can't move freely, you'll get a constant rubbing and wear of the brake pad.
    The whole assembly needs to be removed, cleaned and corroded/worn parts replaced. It shouldn't be difficult for a qualified brake mechanic. Check the rotor for scoring... it might need to be replaced. Also check all the other brake calipers. They probably are corroded also.
    Brake job all around!
     

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