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When creeping forward brakes feel like a warped rotor

Discussion in 'Gen 3 Prius Care, Maintenance & Troubleshooting' started by chuckiechan, Jun 6, 2022.

  1. chuckiechan

    chuckiechan Member

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    When I let the car creep forward with my foot on the brake I get a that warped rotor feeling. But I never feel it during a normal stop. Just when “creeping”.
    Is this likely to be a warped rotor or worse?

    2013 Gen 3, 90k miles mostly city.
     
  2. bisco

    bisco cookie crumbler

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    warped rotor symptom is pulsation in brake pedal

    a common prius problem is rusty rotors and grabby brakes at slow speeds. the solution is putting it in neutral around 30mph and gently applying brakes
     
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  3. chuckiechan

    chuckiechan Member

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    And just ride them to a stop? Hard or soft? I curious of the mechanics of it.
     
  4. bisco

    bisco cookie crumbler

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    you don't have to stop, just apply gently for a little while. prius brakes don't get used much due to regen, so rust can build up on the cheap iron rotors, especially in moist environments.

    in neutral, no regen, pads wear the rust off.
     
  5. chuckiechan

    chuckiechan Member

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    I’ll try that. If no joy I’ll pull the tires and shoot the with Brakcleen (?).
     
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  6. Mendel Leisk

    Mendel Leisk Senior Member

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    Have you done (or had done) a brake service, where the calipers are lifted off the rotors, caliper slide pins cleaned/lubed, ditto for pads/shims and points of contact on caliper? While doing that, if there's a suspicion of brake warpage it doesn't hurt to install a dial indicator with magnetic base, see how much "wobble" the rotor has. Check rotor thickness too, with a micrometer. Specs for that in attached.

    Toyota recommends to do this sort of service every 3 years or 30K miles.
     

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  7. chuckiechan

    chuckiechan Member

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    I’ll check that. I was planning to pull the wheels asap and looses things up and re assemble.
     
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  8. Mendel Leisk

    Mendel Leisk Senior Member

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    One thing: that whirring sound you hear when opening drivers door, is something you DON’T want to hear, when a caliper is off; it’ll pop the caliper piston right out. If you do the brakes, with a caliper lift off, to play it safe:

    1. beforehand disconnect and isolate 12 volt neg cable.

    2. When everything is reassembled press the brake pedal multiple times.

    3. Reconnect 12 volt neg cable.

    you’ll lose trip meters, radio presets and car will be a little weird for next few start ups.
     
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  9. 9001MPG

    9001MPG Junior Member

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    Mendel, where do you get that documentation? I'm looking for the equivalent for my Toyota fielder (Prius c under the hood) 2013. Same brake procedure, torques etc apply I assume as it's all so similar (if not identical?). Thanks.
     
  10. Mendel Leisk

    Mendel Leisk Senior Member

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    I have a pdf of 3rd gen Repair Manual, but not the c. It's a static doc, internal links don't work, but meh. I just "print" pdf excerpts, as needed.

    I think it helps that Toyota put out a pdf version for 3rd gen, but has discontinued now, just online I think. It's still doable: Someone here made a rough version of 4th gen manual. The bookmarks are not that great, and everything's just sorted alphabetical. So for example "install" comes before "remove". But at least it's all there. I'd assume he took out a short term Techstream subscription. I luckily cadged a copy of that.
     
  11. 9001MPG

    9001MPG Junior Member

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    Ah right, thanks for the info. Perhaps I will need to get a techstream subscription at some point. Cheers
     
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