Rear brake calipers

Discussion in 'Gen 3 Prius Technical Discussion' started by welldone01, Jan 11, 2018.

  1. welldone01

    welldone01 New Member

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    How does a guy guy turn or push back the piston? I turned it a good 10 plus full revolutions and they don't move back. The one I'm trying had a stuck slider so it ground the inside pad up. I been doing it with a channel locks and know about getting the x lighted back up. How many turns does it usually take to get it back in? I measured with a caliper and noticed very little change as I moved it.
     
  2. Shane Burns

    Shane Burns Member

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    You need to push it hard as you turning with your channel lock. Also make sure the brake reservoir cap is removed while doing the brake job.
     
  3. thuwaragan

    thuwaragan Junior Member

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    You don't really have to turn it at all. When I changed my pads, I first tried spinning it like you said, but it just kept turning without going in. Use a C-clamp to push it back in (might want to put the old pad between the piston and the c-clamp to distribute the force evenly)
     
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  4. Mendel Leisk

    Mendel Leisk 'Orrible Oracle

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    I've only turned ours a little, to get the cross pattern in the correct orientation, like this:

    upload_2018-1-11_8-58-39.png

    So I can't say from first hand experience that screwing it in is the only way, but I'm very sure, from the Repair Manual and previous cars, rotating the piston clockwise is the only way to get it to retract into the caliper. You're basically screwing it in.

    It'll go a lot faster with this disc brake piston tool (mount on a 3/8" ratchet wrench):

    upload_2018-1-11_9-3-59.png
    upload_2018-1-11_9-6-46.png
     

    Attached Files:

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  5. tvpierce

    tvpierce Senior Member

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    What year is your car? My '13 Prius v wagon doesn't have twist in rear calipers -- they just press in like conventional calipers.
     
  6. Mendel Leisk

    Mendel Leisk 'Orrible Oracle

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    Maybe a mini-drum brake setup for parking brake, on the v?? (n)
     
  7. tvpierce

    tvpierce Senior Member

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    Yes, drum parking brake mechanism utilizes the interior of the disc as a drum.
     
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  8. Mendel Leisk

    Mendel Leisk 'Orrible Oracle

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    Yeah, so it is:

    upload_2018-1-24_15-6-7.png

    For comparison, 2012 Prius (regular):

    upload_2018-1-24_15-9-27.png

    And just out of curiousity, 2016 Prius (regular):

    upload_2018-1-24_15-11-9.png

    (looks to have the same integrated parking brake mechanism as regular third gen)
     
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  9. tvpierce

    tvpierce Senior Member

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    Ah, so it's a V thing, not a model year thing. Thanks for posting.
     
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  10. 5 Speed

    5 Speed Member

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    I used a pair of needle nose pliers to turn the piston. So a good brake cleaning with brake cleaner is a good idea before you start. If it has been 100K+ it will be quite difficult to get the piston started but it will eventually start to move. Be careful to not cut the small rubber boot and you will need to compress it all the way if you have a new set of pads.
     
  11. Mendel Leisk

    Mendel Leisk 'Orrible Oracle

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    The cube shaped tool is cheap and readily available though. It's easier to use, safer too: no chance to slip, maybe nick the boot.
     
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