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"Exact fit" brake pads are too thick?

Discussion in 'Gen 3 Prius Care, Maintenance & Troubleshooting' started by BigFatGuy, Oct 8, 2023.

  1. BigFatGuy

    BigFatGuy Member

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    2013 Prius front brake rotor and pad swap. I've done this before on other cars, and changed pads on a 2012 Prius, all were easy.
    The new rotor goes on fine, caliper bracket bolts back on no problem, pads go in like they should, but then no clearance for the caliper.... The piston is pushed back all the way, but I'd have to hammer the caliper on, damaging the pads and making them drag on the rotor. Did Advance mess up with their "exact fit," or am I missing something stupid here...? Is there a caliper expand button hiding somewhere? o_O
     

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  2. ChapmanF

    ChapmanF Senior Member

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    It seems to be always something with the aftermarket pads. Others here have reported taking grinding wheels to the ends of the backing plate because that dimension doesn't fit.

    My only experience so far has been with Toyota pads. Those come out of the box and go on the car and fit.
     
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  3. ASRDogman

    ASRDogman Senior Member

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    They exactly fit wrong.... take them back and get toyota pads.
    The cost is about the same.... and they just work, exactly.... (y)

     
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  4. Tombukt2

    Tombukt2 Senior Member

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    Wow that's weird I haven't had trouble with the wearever gold from advance. Or the duralast ceramic I guess they're top of the line for AutoZone none at all matter of fact just put on a set like day before yesterday one of the easiest brake jobs like the Corolla You can possibly do other than remembering to have the 12 volt system disconnected or the remote away from the car other than that same. I've even ordered really cheap pads from online from companies you would never want to even look at they seem to work fine especially in the Prius. And all the my cars even have slotted dimpled cooled rotors made by whoever with some kind of coating that makes them stay silver for a real long time and they've stayed silver for a real long time inexpensive too. And when that light bulb goes off upstairs you can just sand the pads off a little bit too Don't want to go crazy just remove a little bit of material or go back and get another set or go to Toyota and get a set All of these are options.
     
  5. ColoradoBoo

    ColoradoBoo Senior Member

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    Dang, I've never heard of this problem....something else to worry about!

    Is the diameter of the rotor the same as the old one? If so, swap them at the store for the right ones.

    FWIW, I've done a number of brake/rotor jobs and my favorite non-Toyota rotors are Bosch at O'Reillys and non-Toyota pads are Import Direct Ceramic from O'Reillys...never had problems with them.
     
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  6. Mendel Leisk

    Mendel Leisk Senior Member

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    It never occurs to me, to shop anywhere other than a dealership parts department. Return the advance stuff if you can, or just eat it, and get the Toyota parts.
     
  7. ASRDogman

    ASRDogman Senior Member

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    advanced, autozone, napa, whatever, they all get their parts from china now. Sadly.
    cheap junk is cheap junk no matter where you get it from.
     
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  8. BigFatGuy

    BigFatGuy Member

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    I may have figured it out. Part number ends in 1184AH on the box, but just 1184 on the pad. Might be the wrong ones. Will take them back to see if we can open another 1184AH box.
    Thanks for the insight.
     
  9. tak1313

    tak1313 Member

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    Although I've never used Carquest rotors/pads specifically, I have never personally used OEM rotors/pads on any car I've had my whole life (I'm going to hit 61 soon). It's mostly been a matter of either/or/and price and availability.

    I have PERSONALLY never had that issue - at least THAT tight. It LOOKS like the pads were designed (dimension wise) without consideration for the shim thickness.
     
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  10. OptimusPriustus

    OptimusPriustus Active Member

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    When buying aftermarket parts one should not buy the most affordable ones. This is especially true with high production volume cars, absolutely horrible stuff available out there. But the better ones cost almost same as OEM so why bother at all.
     
  11. BiomedO1

    BiomedO1 Senior Member

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    Pads that are too thick has happened to me a few times. What I do is put the new pad against the piston side and a old pad on the other side. Make sure the brake reservoir cap is off. Pry the caliber back again, against the old pad - but don't muscle it too much, you may warp or bend something. That'll usually gets me that extra 1/8 of an inch I need for the new pads.
    If you push the caliber piston back with a brake tool or C-clamp, I don't think you'll run into this issue; unless you forget to pop the brake reservoir cap off :mad::whistle:

    Hope this helps...

    PS, forgot to mention; front calipers only - rear calipers are a different beast all together.
     
    #11 BiomedO1, Oct 11, 2023
    Last edited: Oct 11, 2023
  12. ChapmanF

    ChapmanF Senior Member

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    OP wrote the piston is pushed back all the way. In my experience that kind of goes without saying when installing new pads; it's not going back on otherwise, OEM or non-OEM.
     
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  13. BiomedO1

    BiomedO1 Senior Member

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    I know, but since I'm not looking at it - I'm assuming KISS (keep it simple stupid).
    I've never had to resort to grinding down a new pad, or using a 'fix-all-tool' (hammer) - even on cheap non-OEM pads. I do compare the outline of the new pads to the old ones, before trying to fit them. Now squeaking is another story.
     
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  14. jzchen

    jzchen Newbie!

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    AutoZone stock (AZO): $2571.83
    Advance Auto stock (AAP): $51.26

    I guess I now know why…..
     
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  15. tak1313

    tak1313 Member

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    I don't buy "the most affordable one," but I don't buy the most expensive ones either. I have usually gone for Centric (not the cheap line that I forget what the name of was), but have also gone with Raybestos, Bendix, Wagner, Power Stop, Beck Arnley, etc. depending on the car/truck and availability.

    When I started going with Centric, it was primarily because MULITPLE shop owners have told me that it's the brand that causes the fewest comebacks - even compared to OEM (which is currently manufactured by Akebono as far as I know of the industry, with Centric being another big OEM supplier (just not Toyota)).
     
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  16. BigFatGuy

    BigFatGuy Member

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    RESOLVED!
    Thanks for all the thoughtful comments. They sent the wrong parts in the correct box. :confused: They swapped out at no cost. The new pads are noticeably thinner and went right in.

    Agree with the above, never buy the cheapies. When I had my '07 (profile pic), I put Brembo pads in. Didn't see a difference really, so decided to save money here. Not Amazon junk, but something decent and affordable. I've written about this, but aftermarket can be OEM parts rebranded. The same factories and the same quality parts. That's what I was thinking here, plus a discount code that made it much cheaper than the dealership for essentially the same parts.
    On the other hand, I have also written about counterfeit parts, which are actually kinda fascinating, but also sketchy AF. Don't do that.

    Anyway, problem solved. Lesson learned: open the box in the store to make sure it's the right stuff.
     
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  17. BiomedO1

    BiomedO1 Senior Member

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    Yep, never take a box with greasy finger prints on it.

    I had a similar issue with an O2 sensor. Correct box, but new sensor didn't look quite right. The numbers on the sensor didn't match the box it came in. The store manager tried to say, I can't return an electronic part. I had him pull another one off the shelf and showed him that someone already did refund of this sensor; because it's in the wrong box.:((n)
     
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  18. OptimusPriustus

    OptimusPriustus Active Member

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    Much discussed topic. But unfortunately somebody need to breach something to make it happen. OEM’s spend significant amount of engineering to get parts and manufacturing processes perfected. It’s their IPR. They are not giving it all away voluntarely. They can give some because there will always be pirate/reverse engineered stuff. But they never give out everything.
     
  19. OptimusPriustus

    OptimusPriustus Active Member

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    Much discussed topic. But unfortunately somebody need to breach something to make it happen. OEM’s spend significant amount of engineering to get parts and manufacturing processes perfected. It’s their IPR. They are not giving it all away voluntarely. They can give some because there will always be pirate/reverse engineered stuff. But they never give out everything.
     
  20. nicoj36

    nicoj36 Active Member

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    Don't forget to grease contact points