metal rattling noise from brakes, right front when going over bumps

Discussion in 'Gen 2 Prius Main Forum' started by Jeffrimerman, Apr 17, 2013.

  1. Jeffrimerman

    Jeffrimerman Member

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    I'm pretty sure I know what the problem is since when I hit the brakes it stops. When I took the left side tire off and right side I compared and there is a thin metal sheet that has room to move on the right, but is tight on the left. When the brakes were done before maybe it didn't seat correctly or something. Just wondering if anyone knows what that plate is called so I can order one and change it. Driven that way 2 years, but it bugs me when the window is down and people probably think my car is falling apart=/. Maybe I'll search for a brake diagram.

    Edit: I think they might be called "anti squeal shims". I saw a picture of them, so maybe they didn't put enough high temp grease, but the left side is tight and the rights side you can move a couple milometers side to side so I'm sure that's the jingling noise.

    ReEdit:
    Tech Tip: Toyota Corolla and Matrix Front Brake Rattling Noises: Brake and Front End

    this might be what takes care of it. It's for corolla and matrix but probably similar
     
    2011priusgoofball likes this.
  2. Jeffrimerman

    Jeffrimerman Member

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    called toyota dealer. They said shim kit is what I need. They didn't say anything about the "disc brake pad support plates"
    toyota sells shim kit for $44, but Pepboys has the pads and shims for $49 and even less on other sites. I wonder if their shim kit is specifically to eliminate rattling noise. I don't think the parts guy at toyota really knew much.
     
  3. Jeffrimerman

    Jeffrimerman Member

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    I see disc brake hardware kits that have some pieces that aren't the shim, but they do look like what seems to be loose. I wonder if they are even needed. They are cheap so I can order and change. Not sure what the name of the metal pieces are but they seem to hold the pads.
     
  4. maestro8

    maestro8 Nouveau Member

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    There should not be any rattling from your brakes... there should be nothing that is loose, no play, no gaps between any moving parts. If you do see a gap, then you have a problem with your brakes. The way brakes are designed, the caliper should always be in contact with the pad, and the pad should never be any further than 1/8th of an inch (approx) from the disc.

    Shims are not part of this equation... you should never have to shim a brake assembly to achieve the correct fit. By design, disc brakes are self-adjusting. Problems with fit indicate the brakes are not working properly.

    A noise that goes away when you hit the brakes could also be caused by the suspension. When you apply the brakes, the braking force gets transmitted through the brake pad to the caliper to the front steering knuckle to the lower arm & strut, etc. If there is something loose in this assembly, it could be held tight under braking. You might look to see if something is loose... you can start by jacking the car up, gripping the wheel and seeing if it wiggles in any direction, side to side, front to back, up or down...
     
  5. Jeffrimerman

    Jeffrimerman Member

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    I agree. I've found tons of posts with the exact same issue. Some of them the toyota dealer took them apart and added grease. None of them had any major brake issues. I can flick the piece that is loose and it makes that noise so I'm 99% it's that tin metal piece. I was also thinking maybe it was the suspension. I found 0 posts that the suspension was the issue and when I drove over bumps and just lightly touch the brakes so still moving over the bumps the sound would disappear. I checked the caliper and the pads and they don't move. Pads are exactly where they should be. I also checked the suspension a couple times and nothing would budge. The only thing that would move is the tin piece in the brake assembly.

    If you search "disc brake hardware kit prius" and look at images, you'll see the piece that is loose. I'm picking it up today and will take the brakes apart and replace them with the new clips. When I called Toyota they told me to by a Shim kit. That this would eliminate the rattle. There was an article that mentioned it, but it said to replace another metal piece in the brake assembly. Non of the issues were critical to the functioning of the brakes. I'll update later with my findings
     
  6. xpcman

    xpcman Senior Member

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    When you take the brake pads out - FIRST disconnect the 12 v battery. (some people advise you to also pull 2 relays in the fuse box). If you don't the brake accumulator can activate and blow the piston out of the caliper.
     
  7. bedrock8x

    bedrock8x Senior Member

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    NO, the accumulator pump will not apply pressure to the brakes when running if car is not in Ready and brake not pressed..
    Pressure only applies when brake paddle is pressed.

     
  8. Jeffrimerman

    Jeffrimerman Member

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    Car will be off, but should I dis connect 12v battery even if brake won't activate?
     
  9. xpcman

    xpcman Senior Member

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  10. Jeffrimerman

    Jeffrimerman Member

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    ere is what I changed. I only drove a block to work and didn't hear anything but the test will be when I drive over lots of little bumps. The new clip is in snug. Definitely a noticeable difference. The brakes were always done at Toyota so I'm sure they recycled them for the last $200k miles.
    [​IMG]
    [​IMG]
     
  11. Jeffrimerman

    Jeffrimerman Member

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    Looks like it was the metal clip. I drove over the bumps that would easily make it rattle and now nothing. It was quiet. Not sure why no post ever mentioned these as being a possible source. They are thin and tinny. The mechanics probably never told them what they changed to fix the brakes. Hopefully anyone searching will find this post.
     
  12. maestro8

    maestro8 Nouveau Member

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    You were talking about the "anti-squeal" plate. Completely different part.

    I've done loads of brake jobs and have never seen a broken clip. Guess you got a bad one! Glad your problem's solved.
     
  13. Jeffrimerman

    Jeffrimerman Member

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    Yeah, that's what some of the posts were referring too. It was totally intact, but maybe was tweaked so it didn't fit snug anymore. Thanks, I hope others find it useful.
     
  14. nh7o

    nh7o Off grid since 1980

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  15. Nick Seifert

    Nick Seifert New Member

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    I know this is an old thread, but just wanted to chip in a few thoughts on the disc pad's rattling. In my '07 the issue was the abutment shims, which prevent the pads from moving up and down, were worn out. These are typically included in the "disc brake hardware kit" sold by the major auto-parts sites.

    The symptoms i had were that the front brakes emitted a loud "chatter" or "rattle" kind of noise when driving over bumps. The noise would go away when pushing the brake pedal enough to engage the disc brakes, even when riding over bumps.

    These hardware kits contain the abutment shims, as well as sometimes the slider pin boots. These shims are sometimes called slider shims, or anti-rattle shims. they are NOT the same as the clips that go on the back of the pads.

    One word of caution for these hardware kits: i bought a kit from Dorman, and it included 4x identical shims. This is NOT right. These kits should have 2x of two different types of abutment shim. one shim has a "P" shaped edge, which contacts the pads, and prevents rattling. The other 2x shims don't have this "P" edge. These should be paired together with 1x P shim on each side. Get this kit from Warner or Bosch instead of Dorman junk.

    i've included pictures of these shims below.

    I advise putting the "P" shaped shim on the top. This should prevent it from wearing out prematurely, as it won't be constantly compressed when you actuate the brakes.
    MVIMG_20190901_171355.jpg MVIMG_20190901_171422.jpg
     
  16. Jeffrimerman

    Jeffrimerman Member

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    Yup those were the pieces I changed a while back. I think I have a bunch more somewhere since I only needed like 1 or 2 in case anyone needs some.
     
  17. ChapmanF

    ChapmanF Senior Member

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    If you buy the parts from Toyota, what you're showing here as "abutment shims" make up what Toyota calls the "fitting kit". There's a "shim kit" (the flat ones that go behind the pads, and that kit includes a packet of shim grease), and there's a caliper rebuild kit, which is all the rubber parts (piston seal, piston boot, slide pin boots, bleeder cap) and the rest of the miscellaneous bits and bobs, and that kit has a packet of the red grease that they specify for all of the rubber parts around the piston and slide pins. (Each of these kits includes all of the corresponding parts for two calipers.)

    The aftermarket parts in your photo look like they are just bright metal plated. The "fitting kit" pieces from Toyota come with a dry, Teflon-like coating that allows the pads to be applied and released easily, without needing a grease (which would pick up lots of grot, considering how exposed those pieces are).

    It is possible to also get rattles if the flat shims (behind the pads) don't have enough of the supplied gray shim grease applied to dampen their motion. On the other hand, I haven't reapplied that stuff yet, and mine aren't rattling, or at least not in any way that bothers me. :)
     
  18. Jeffrimerman

    Jeffrimerman Member

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    My problem was that the piece was loose so it jingled a little but there was no malfunction and just putting a new one eliminated the jingle. I could have taken it out and tweaked it to fix it also I think but it was so cheap to buy a few of them.
     
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