Brake pad wear

Discussion in 'X5' started by pistonbroke, Jan 14, 2019.

  1. pistonbroke
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    pistonbroke

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    Can anyone suggest why a single front brake pad on my 2002 E53 has worn differently to the rest. The right wheel pads have worn evenly and are about 4mm now. On the left, the outer pad is the same ,but the inner pad (ie. pushed directly by the caliper piston) has worn at an angle.
    The outer edge is about 4mm but the inner edge (closest to the hub centre) is down to bare metal.
    The brakes have behaved normally. No pulling or noises till now, when I heard the scrape of metal to metal.
    I will obviously change all pads now. The rotors were fairly worn anyway and must also be changed.
    There must be a reason for the irregular wear and I need to know what I should look for as I replace parts to make sure it does not recur.
     
  2. Alan Gunn
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    Alan Gunn

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    My guess would be the slide pins are rusted and stuck.
     
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  3. Singvogel
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    Singvogel Moderator WARLORD Site Supporter

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    Wot he said.
     
  4. slim_boy_fat
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    slim_boy_fat WARLORD Site Supporter

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    Welcome to the forum, pb :wavey:

    I'd agree with Alan ^ - I replaced these on the E60 to cure a speed related noise but did it before the pads wore unevenly.

    Easy enough fix it you're handy with the spanners, or not a huge job for your garage. Have you had a word with them for their opinion?
     
  5. mach one
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    mach one WARLORD Site Supporter

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    sounds like a sticking caliper that is causing your uneven pad wear

    I have just had the same issue on my works van, 22500 miles and two years old and the rear nearside caliper was sticking and the pad on one side was worn to the point where it needed replacing

    the van went into fleet workshop and their solution was a new caliper and new discs and pads on the rear which is crazy for such a low miles vehicle, for me i would have been spending a bit of time trying to diagnose and repair the problem but fleets solution was replace all the parts that could be causing the problem

    if it was my car i would get the car up on the jack and stand, remove the wheel and then remove the pad retaining clip, and then remove the protective plugs and take out the caliper guide bolts and see what they look like clean and refit or replace them to see if this cures the issue, it could as simple as sticky guide bolts or it could be a problem with the caliper
     
    Last edited: Jan 14, 2019
  6. pistonbroke
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    pistonbroke

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    Thanks for all for the feedback. I did the obvious and removed calipers, pads and rotors on both sides. Put new rotors and pads. Cleaned and lubed the caliper slide bolts. The left inner pad had scored the left rotor a bit, but they were both near the wear limit anyway so they both got binned.
    Nothing out of the ordinary at all with the caliper pins. I am meticulous about cleaning and lubing them at every pad change and they were still shiny and not scored or seized at all.
    The only possible issue was the pad retaining clip which clips onto the outside of the caliper (on the left side) was missing. I blame the garage that replaced lots of front suspension joints a while ago. I think they just omitted to replace it . However, I can't really figure how that could cause the inner pad to wear so badly.
    Unless someone has an explanation, It will have to go down as an unsolved mystery.
     
  7. Mieke
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    Mieke WARLORD Site Supporter

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    If it's not the slide pins, then most likely a sticking piston on that caliper.
     
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  8. Singvogel
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    Singvogel Moderator WARLORD Site Supporter

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    I agree.

    @pistonbroke - I'd been keeping an eye on that caliper/pad for a while.

    But fingers crossed the problem doesn't come back.

    Good luck.
     
  9. slim_boy_fat
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    slim_boy_fat WARLORD Site Supporter

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    If it's a sticking caliper, the wheel will be noticeably hot to the touch, compared to the other side.
     
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