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  1. #1
    ClioSport Club Member
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    Jan 2007
    Location
    N.Ireland
    Posts
    164
    Car
    172 cup

    Failed MOT for rear brake imbalance


    I need help..
    I booked my 172 cup in for mot at the start of the month which it failed.
    the guy said it was an imbalance with the foot brake on the rear brakes.
    so that weekend I looked at them to see what was happening.
    The disks looked as if they where on there way out to went to renault and got nice new disks and pads.I also replaced the brake fluid and tryed to free up the caliper piston and it seemed to wind in and out freely so i rebooked my car for a few days later

    Failed again for the same thing

    so I thought the drivers rear caliper must be f**ked

    replaced and reblead brakes and rebooked

    Failed again for the same thing

    I'm starting to run out of idea's

    I know about the 172 cups having low braking effort but they said they are out of ballance

    I have only owned this car for 3 months and love it but this is starting to f**k me right off

    what do you think?

  2. #2
    Forum User
    Join Date
    Feb 2009
    Location
    Caernarfon.. North Wales
    Posts
    3,058
    Car
    Astra 1.9Cdti SRi

    Re: Failed MOT for rear brake imbalance

    theres an article about the rear brakes on the Cup, all you have to do is show it to them and they will pass it,

    il have a look for it now..

    http://www.dft.gov.uk/vosa/repositor...Apr%202006.pdf

  3. #3
    ClioSport Club Member
    Join Date
    Feb 2007
    Location
    The Shire
    Posts
    3,426
    Car
    A gunmetal one

    Re: Failed MOT for rear brake imbalance


  4. #4
    ClioSport Club Member
    Join Date
    Mar 2006
    Location
    Birchdown.com
    Posts
    5,981
    Car
    Mondeo TDCI 130

    Re: Failed MOT for rear brake imbalance

    ^ what he said! You can still turn the wheels when your foot is fully pressed!

  5. #5
    ClioSport Club Member
    Join Date
    Jan 2007
    Location
    N.Ireland
    Posts
    164
    Car
    172 cup

    Re: Failed MOT for rear brake imbalance


  6. #6
    ClioSport Club Member
    Join Date
    Jan 2007
    Location
    N.Ireland
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    164
    Car
    172 cup

    Re: Failed MOT for rear brake imbalance

    I have showed them 3 times now and i got 3 different guys????

  7. #7
    ClioSport Club Member
    Join Date
    Mar 2006
    Location
    Birchdown.com
    Posts
    5,981
    Car
    Mondeo TDCI 130

    Re: Failed MOT for rear brake imbalance

    So the O/S rear is reading low, if the pads and discs are ok as you say. try another caliper!

    Edit, I can't remember, been a while since i did mot's personally, but i am sure you can't fail imbalance on the rear. Do not quote me though.

  8. #8
    ClioSport Club Member
    Join Date
    Jan 2007
    Location
    N.Ireland
    Posts
    164
    Car
    172 cup

    Re: Failed MOT for rear brake imbalance

    so your saying this applys to an imbalance as well as low braking effort?

  9. #9
    ClioSport Club Member
    Join Date
    Jan 2007
    Location
    N.Ireland
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    164
    Car
    172 cup

    Re: Failed MOT for rear brake imbalance

    Quote Originally Posted by SBV116 View Post
    So the O/S rear is reading low, if the pads and discs are ok as you say. try another caliper!

    .
    yea o/s rear is lower and new caliper on still made no difference

  10. #10
    Forum User
    Join Date
    Mar 2008
    Location
    Spalding
    Posts
    690
    Car
    RB 182 cup

    Re: Failed MOT for rear brake imbalance

    as far as im aware you cannot fail a car for rear brake imbalance you can only do this on the front. now im tester and im possitive you cannot fail it on that. i would ring up vosa, im sure the number is on the back of the mot and ask them to comfirm this

    if the tester is still being picky, ask for him to do a decelerometer test and it will pass no problem

    edit.

    quick search for this

    ''Rear imbalance (or more pedantically, imbalance on non-steered axles) is not a reason for rejection, so, providing each side meets the minimum brake force requirements when tested, it will pass. On steered axles, 25% imbalance is allowed''

  11. #11
    ClioSport Club Member
    Join Date
    Jan 2007
    Location
    N.Ireland
    Posts
    164
    Car
    172 cup

    Re: Failed MOT for rear brake imbalance

    does no one else get a print out with the braking values on it or is it only mot centres in n.ireland?

  12. #12
    ClioSport Club Member
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    Jan 2007
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    N.Ireland
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    164
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    172 cup

    Re: Failed MOT for rear brake imbalance

    Quote Originally Posted by Tom84 View Post
    as far as im aware you cannot fail a car for rear brake imbalance you can only do this on the front. now im tester and im possitive you cannot fail it on that. i would ring up vosa, im sure the number is on the back of the mot and ask them to comfirm this

    if the tester is still being picky, ask for him to do a decelerometer test and it will pass no problem

    edit.

    quick search for this

    ''Rear imbalance (or more pedantically, imbalance on non-steered axles) is not a reason for rejection, so, providing each side meets the minimum brake force requirements when tested, it will pass. On steered axles, 25% imbalance is allowed''
    where did you get this information if you don't mind me asking as I would love to have the upper hand

  13. #13
    Forum User
    Join Date
    Mar 2008
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    Spalding
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    Car
    RB 182 cup

    Re: Failed MOT for rear brake imbalance

    forget me just seen ur in NI and they have different rules

    quote

    ''The out-of-balance of the Service brakes on ANY AXLE, greater than 30%''

  14. #14
    ClioSport Club Member
    Join Date
    Jan 2007
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    N.Ireland
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    164
    Car
    172 cup

    Re: Failed MOT for rear brake imbalance




    here is the display read out

  15. #15
    Forum User
    Join Date
    Oct 2007
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    LEEDS
    Posts
    152
    Car
    RS CLIO 197

    Re: Failed MOT for rear brake imbalance

    rear brakes - perhaps its not the low effort one thats at fault - its a cup so should have "low" effort on both sides - perhaps the issue is the side with the high reading ?

  16. #16
    ClioSport Club Member
    Join Date
    Jan 2007
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    N.Ireland
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    164
    Car
    172 cup

    Re: Failed MOT for rear brake imbalance

    never thought of it like that
    has anyone any results for the braking effort on the rear so I could compare?

  17. #17
    ClioSport Club Member
    Join Date
    Jan 2007
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    N.Ireland
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    164
    Car
    172 cup

    Re: Failed MOT for rear brake imbalance

    I don't know where to go from here.

    I cheched the n/s caliper when I was checking the o/s and it seemed fine

  18. #18
    ClioSport Club Member
    Join Date
    Jan 2007
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    N.Ireland
    Posts
    164
    Car
    172 cup

    Re: Failed MOT for rear brake imbalance

    is it possible that a caliper could be working to well?

    there are so many questions in my head right now

    lol

  19. #19
    ClioSport Club Member
    Join Date
    Jan 2007
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    N.Ireland
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    164
    Car
    172 cup

    Re: Failed MOT for rear brake imbalance

    or is it possible that I have a mismatched caliper on the side that is reading high braking effort?- from the factory..

    I bought the car in england about 3 months ago and because an imbalance in the rear wheels does not fail the car in england this fault would never of been spotted before.

  20. #20
    ClioSport Club Member
    Join Date
    Jan 2007
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    N.Ireland
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    164
    Car
    172 cup

    Re: Failed MOT for rear brake imbalance

    I have removed the brake compansater under the rear axle to have a look.

    and it is completely F***ed
    inside I found two valves (one for the L/H rear & R/H rear wheel)
    the one controling the R/H rear was seized and caked in rust and dirt so got on the phone to renault and ordered a nice new ..


 

 
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