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Rear Brakes Squeaking while in Reverse

Discussion in '5th Gen 4Runners (2010-2024)' started by storm180, Apr 18, 2024.

  1. Apr 18, 2024 at 2:40 PM
    #1
    storm180

    storm180 [OP] New Member

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    I have a 2020 4runner TRD Pro and I have an interesting issue that no one has been able to solve yet and I have been to Toyota and some other shops.

    Over the two years or so I have had a problem come up that the back brakes were squeaking when I would put it in reverse. I was at Toyota several times where they replaced the pads, calipers, rotors, etc. Problem would go away for a little while but it would come back.

    I decided to get the big brake powerstop kit that had slotted rotors,pads, and calipers. I put the on and for about three months no issues. Then the reverse squeak came back and it will do it all the time doesn't matter if it sat overnight or driving it all day. It is pretty annoying and embarrassing. This was professionally installed by a 4x4 shop in town.

    I went back to them several times now and I don't know what they are doing to them really but they last about a day or so then the squeak is back. On the last time I brought it back they told me that those slotted rotors should be cleaned every couple of days and showed me some anti-squeak to put on them. I said that can't be right, you want me to take my wheels off every two days and do this? Then they are we really don't know what the issue is.

    I had another shop check the camber to see if anything was out of wack in the back and they even checked the drive housing and axle for anything weird and nothing. I also had the e-brake cable check to see if that was causing the issue and it wasn't.

    The brake pads and rotors are in good shape. I had one suggestion was to maybe go to another set of pads. The pads in there are Z36 Carbon-Fiber Ceramic Brake Pads that came with the kit. However, knowing I had this issue with the oem equipment and still having the issue with aftermarket is kind of strange.

    I did check the u-joint and if the brakes are not applied there is no brake noise in reverse. So I know it isn't the u-joint and it is coming from the passenger side of the vehicle. Does anyone have any suggestions?
     
  2. Apr 18, 2024 at 3:03 PM
    #2
    HuskyMike

    HuskyMike New Member

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    Does the 4Runner have a separate e-brake pad? If so, did they replace that pad and associated hardware and/ or adjust the e-brake?
     
    TrailSpecial22 likes this.
  3. Apr 18, 2024 at 3:15 PM
    #3
    storm180

    storm180 [OP] New Member

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    To be honest I don't know if it has a separate e-brake pad. I know the e-brake was checked by both toyota and the 4x4 shop to see if it was causing the issue but I have never looked at it myself.
     
  4. Apr 18, 2024 at 4:57 PM
    #4
    McSpazatron

    McSpazatron New Member

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    It could be that the parking brake shoes in the drum part of the disc needs to be backed off a bit. Or that the parking brake hardware is packed with mud.

    If it’s the regular pads making the the sounds, then maybe try putting some “disc quiet” between the shims that go on the brake pads.

    IMG_3593.jpg
     
    TrueTexas and TrailSpecial22 like this.
  5. Apr 18, 2024 at 5:41 PM
    #5
    storm180

    storm180 [OP] New Member

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    I would have hoped they checked the inside of drum for the e-brake during the diagnosis. I don't know what disc quiet they used but they have used something like that in the past. There has to be something they are missing that is causing this issue. I did see in a taco forum that someone went through multiple manufacturers of brake pads and found the centric posi quiet fixed his issue.
     
  6. Apr 18, 2024 at 7:11 PM
    #6
    McSpazatron

    McSpazatron New Member

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    With rotors being replaced a few times, yeah, you would think they went over the parking brake hardware, but that doesn’t mean they did. A lot of people don’t ever use parking brakes, and your mechanics might have be among them. The only way to be sure is to ask them.

    I’ve had some squealing from the front brakes in reverse the first year I had the 4runner, but it’s gone away. Seemed to be related to humidity/temp. They only did it when the car was still cold.

    regarding the parking brake, it might be worth re-bedding them on the off chance they have a perfect layer of rust or contaminants on the drum surface that produces the noise. Just take your car to an empty dead end street, drive at 20mph, then slowly but fully apply the parking brake until it they bring you down to a full stop. Drive for a minute to cool them down, and repeat a couple of more times. That should clean up the braking surface.

    Have you submerged the back wheels in mud or muddy water? If you have, then you probably need to remove the caliper and the rotor so you can clean out all the dirt that gets in there.
     
  7. Apr 18, 2024 at 8:10 PM
    #7
    storm180

    storm180 [OP] New Member

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    Yeh, I will have them check the inside of the e-brake and see if there is any buildup or anything that needs to be adjusted. I haven't had the back wheels in any muddy water or submerged.
     
  8. May 5, 2024 at 4:41 PM
    #8
    Greg D

    Greg D New Member

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    Mine do same thing after sitting and rusting overnight. I think it's just rear pad squealer when you go to reverse and they shift slightly. My pads are fine I know but rears do seem to wear much faster than front pads.
     
  9. May 13, 2024 at 2:31 PM
    #9
    Greg D

    Greg D New Member

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    I have Powerstop brakes and I read a post about rear brakes wearing out 3 to 1 compared to front. 30-40k was quoted. Mine do that in morning first time
    I read a post about rear Powerstop wearing out 3 to 1 compared to front. Mine started squealing first thing in the morning only in reverse. I checked and at about 40k on my rear I probably have 4mm of pad left . Better to change early and eliminate chance of warping rotor. If it's even possible. I am hoping leveling it out may help with the issue.
     

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