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Brakes Screetching and heavily grinding!

Discussion in 'VZ Holden Commodore (2004 - 2006)' started by social, May 17, 2012.

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  1. May 17, 2012 #1
    social

    social Ute Finatic

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    Hey guys recently sprayed my calipers and rotors, sanded down the rotors so no surface rust and glaze with a 120 grit sandpaper. Now I've got really loud grinding in the rear on the pads, horrible sound and when I'm slowly rolling at 5kmh I can hear it grinding too.. Solutions!?
     
    social, May 17, 2012
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  2. May 17, 2012 #2
    KAL SPL

    KAL SPL Member

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    Blown VS Calais !!
    Stop doing work to your car ?

    But seriously , you sanded the surface where your pads actually grab ?
     
    KAL SPL, May 17, 2012
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  3. May 17, 2012 #3
    somefool

    somefool Member

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    try bedding them in again.

    I would hope ya didnt sand them down so to speak. but rather 'roughed up the surface a little'

    did it squeal or grind at all before u did this work?
     
    somefool, May 17, 2012
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  4. May 17, 2012 #4
    puhz

    puhz New Member

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    I'd suggest getting them machined properly it doesn't cost that much:surprise:
     
    puhz, May 17, 2012
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  5. May 18, 2012 #5
    KAL SPL

    KAL SPL Member

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    You will probably have to replace the pads given they now have paint melted to them if you didn't mask up your discs before painting.
     
    KAL SPL, May 18, 2012
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  6. May 18, 2012 #6
    social

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    Yes I did sand the surface of where they grab, no they didn't do this before and I masked tediously up all areas before spraying, mayb I roughed up the surface too much...
     
    social, May 18, 2012
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  7. May 18, 2012 #7
    social

    social Ute Finatic

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    If I take them off and get a 400 grit paper to them n smooth it off more will it help? Also will a smooth off of the brake pads surface help?

    Remembering I did the fronts the same and they're fine..
     
    social, May 18, 2012
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  8. May 18, 2012 #8
    wraith

    wraith Hand over the dog bikkies

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    Good lord. Take it to a brake place and get them to have a look. No offence but you obviously don't know what your doing.
     
    wraith, May 18, 2012
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  9. May 18, 2012 #9
    KAL SPL

    KAL SPL Member

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    Just wow ...
     
    KAL SPL, May 18, 2012
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  10. May 18, 2012 #10
    richardpalinkas

    richardpalinkas Blown Alloytec

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    Maybe have a look to see if you put a pad in backwards
     
    richardpalinkas, May 18, 2012
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  11. May 18, 2012 #11
    social

    social Ute Finatic

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    I don't see where a mistake has been made, what is wrong with sanding the surface ?
     
    social, May 18, 2012
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  12. May 18, 2012 #12
    richardpalinkas

    richardpalinkas Blown Alloytec

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    Was it just a light sand? Why did u sand the face of the rotor?
     
    richardpalinkas, May 18, 2012
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  13. May 18, 2012 #13
    Jesterarts

    Jesterarts Your freedom ends where mine begins

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    Nooo... stop sanding the damn things. The damage is done.

    Read this thread, the last page or so in particular:
    http://forums.justcommodores.com.au/general/195169-using-sandpaper-roughen-up-brake-rotors.html

    In your case, take the rear apart and make sure there isn't any crap on the rotor or pad surface. Make sure it's all in the correct way and see how you go.

    If you are still getting an issue, take it to a brake place.

    What is with people sanding rotors lately??
     
    Jesterarts, May 18, 2012
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  14. May 18, 2012 #14
    social

    social Ute Finatic

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    Was just taking surface glaze off jester. Just bought new rotors and pads and found if put a pad on backwards... That's wat caused the problem.. Accidental mistake
     
    social, May 18, 2012
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  15. May 18, 2012 #15
    Jesterarts

    Jesterarts Your freedom ends where mine begins

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    Glad you've got it sorted mate.
     
    Jesterarts, May 18, 2012
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  16. May 18, 2012 #16
    social

    social Ute Finatic

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    While everyone's all knowledgable on the subject, can I use htb high temp bearing grease on the pin guide? Looks like it could use some, the piece I speak of is what the caliper swings on when u crack one of the nuts to remove the pads, seems tad dry. Htb suitable?
     
    social, May 18, 2012
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  17. May 18, 2012 #17
    richardpalinkas

    richardpalinkas Blown Alloytec

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    Yea that's fine, or that never seize stuff
     
    richardpalinkas, May 18, 2012
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  18. May 18, 2012 #18
    social

    social Ute Finatic

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    the damage
    [​IMG]

    the goods
    [​IMG]


    Still cant believe i made such an obvious mistake with a backwards pad.. all fixed anyway.
    the result
    [​IMG]
     
    social, May 18, 2012
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  19. May 18, 2012 #19
    richardpalinkas

    richardpalinkas Blown Alloytec

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    Make sure to adjust the handbrake too. Adjust it so you can just hear the handbrake shoes rubbing the inside of the rotor without too much resistance
     
    richardpalinkas, May 18, 2012
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  20. May 18, 2012 #20
    social

    social Ute Finatic

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    ive been meaning to adjust my handbrake cos it doesnt engage enough, gatherings its the spline through the hole on the rotor?
     
    social, May 18, 2012
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