Brake Vibration, dont know what to do

Discussion in 'Generation 1 Prius Discussion' started by aperry1971, Oct 12, 2015.

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  1. aperry1971

    aperry1971 Junior Member

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    Change rotors , pads and calipers and I still get a vibration when I hit the brakes slowing down on the highway.

    I also have a load squeal when I first hit the brakes in the morning. It sounds like metal on metal but it is not.
    All this started when I change the brake pads.
    Any help and advice would be very helpful.

    Thanks in Advance
     
    #1 aperry1971, Oct 12, 2015
  2. Lucifer

    Lucifer Senior Member

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    So you changed the pads but not the rotors and it didn't work, so you changed the rotors but the pads were already used, the old rotors destroyed them, so you changed the calipers, but still had pads riding on used rotors, good quiz?
    Anyway, did you properly torque the rotors into place, or did they warp at heat because they were loose?
     
    #2 Lucifer, Oct 12, 2015
  3. Toppcat

    Toppcat Member

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    Have you try switching the tire/wheels front to rear?
     
    #3 Toppcat, Oct 13, 2015
  4. greasemonkey007

    greasemonkey007 Active Member

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    Have you checked to see if the backing plate could be bent, rubbing against the wheel? It can be bent back if needed.
     
    #4 greasemonkey007, Oct 13, 2015
  5. ChapmanF

    ChapmanF Senior Member

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    Hi aperry,

    It's never too late to go back and follow the service manual step by step, including measuring the rotor runout when you reassemble. They suggest testing at each of the four ways the rotor can go on and you'd be surprised how much difference that can make.

    Lucifer, of course, is just testing to see how gullible you are, there is nothing you do to "torque the rotors into place", the wheels hold them on. I sort of wish people wouldn't do stuff like that, it's enough fun to solve real problems when everybody's genuinely out to help.

    Maybe you can post again after measuring the runout?

    -Chap
     
    #5 ChapmanF, Oct 13, 2015
  6. Mendel Leisk

    Mendel Leisk Witness Leader

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    Just a thought: is it drum brakes in the rear? They tend to be pretty uneventful, but who knows.
     
    #6 Mendel Leisk, Oct 13, 2015
  7. aperry1971

    aperry1971 Junior Member

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    Thanks Chap I will check it out and post the results. The weird part is the steering wheel does not shake it acts like when you are on a slippery road and hit the brakes the system vibrates.
     
    #7 aperry1971, Oct 13, 2015
  8. aperry1971

    aperry1971 Junior Member

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    Hi Mendal I changed the back brakes, drums and spring kit at the same time....
     
    #8 aperry1971, Oct 13, 2015
  9. aperry1971

    aperry1971 Junior Member

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    Hi Grease monkey I just checked and it is not hitting on one side the other side does not have one...
     
    #9 aperry1971, Oct 13, 2015
  10. aperry1971

    aperry1971 Junior Member

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    Hi Toppcat I just rotated the tires and still have the same issue
     
    #10 aperry1971, Oct 13, 2015
  11. Mendel Leisk

    Mendel Leisk Witness Leader

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    Have you got a dial gage? And/or micrometer? You can check out the trueness and thickness of the rotors.

    This is for 3rd gen, but maybe the tolerances are similar:
     

    Attached Files:

    #11 Mendel Leisk, Oct 13, 2015
  12. ChapmanF

    ChapmanF Senior Member

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    Wait, so you mean the rapid pulsation, as if the antilock is kicking in?

    I wonder what would happen if you force non-ABS braking (pull one of the ABS relays, unplug a wheel speed sensor, anything so the ABS will error out) ... under plain braking do you feel the vibration or not?

    -Chap
     
    #12 ChapmanF, Oct 13, 2015
  13. Toppcat

    Toppcat Member

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    OK if it not mechanical , let try this! be safe! Pick a part of road where you can get to speed with no one around ! Turn off engine! Apply brakes! This would turn off power to the ABS and see problem exist? Roll off side of road and restart, use 4 way flasher ! Can't express being safe! Have a plan before you do this! This way you can rule out the abs system!
     
    #13 Toppcat, Oct 14, 2015
  14. Mendel Leisk

    Mendel Leisk Witness Leader

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    ^ Aleast normally: if ABS is activating there's a light on the dash?
     
    #14 Mendel Leisk, Oct 14, 2015
  15. aperry1971

    aperry1971 Junior Member

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    It is rapid pulsation but the you can feel the vibration badly also.
    I will try pulling the abs fuse this weekend and see what it does.
     
    #15 aperry1971, Oct 14, 2015
  16. aperry1971

    aperry1971 Junior Member

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    I will try this and see what happens and let you know. Sounds kind of similar to what chap wants to do but don't have to pull a fuse....
     
    #16 aperry1971, Oct 14, 2015
  17. aperry1971

    aperry1971 Junior Member

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    No ABS light is on and I have no codes at all
     
    #17 aperry1971, Oct 14, 2015
  18. aperry1971

    aperry1971 Junior Member

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    and yes it is acting like antilock is kicking in
     
    #18 aperry1971, Oct 14, 2015
  19. aperry1971

    aperry1971 Junior Member

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    Shut the car off while going 60 on a road and hit the brakes and still had the vibration.

    Changed the brake pads and it worked... Thanks all for your advice!!!!
     
    #19 aperry1971, Oct 17, 2015
    Mendel Leisk likes this.
  20. Lucifer

    Lucifer Senior Member

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    Right, new pads on old rotors,ded, but new pads on semi used rotors that haven't worn yet and yer good to go, are the rotors torqued properly?
     
    #20 Lucifer, Oct 17, 2015
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