Kin brakes are still giving me a head ache. - Page 2
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  1. #11
    Official RnS Addict beach57's Avatar
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    What about someone else driving the car and seeing if the problem is your not used to the brakes being that good coming from drums and that's how they should be and there's no problem.But there should be no valve if it's disc's all round.

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  3. #12
    Official RnS Addict beach57's Avatar
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    How much free play have you got on the pedal.

  4. #13
    Official RnS Addict Bel Air Lugosi's Avatar
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    Ok ..... here goes!

    The master cylinder has a 1" bore. < I took it off and measured>
    The pedal has 60mm of travel at the pad.
    The rod has 10mm of travel. < that doesnt sound a lot to me>
    Its got discs up front and drums out back.
    If its low n black n shiny n sparkley n loud n spitting fire....... It's probably mine.
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  6. #14
    Exceeded sell by date Plumpcars's Avatar
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    Assuming I've read your post correctly I've got my tunnel rat to take some measurements for you. I think we have a similair kit...mine used 69-71 Chevelle(Large) calipers and 11" discs and I've got large Ford police spec drums on the back. I've got 60mm travel at the pad with the engine off and that is about 10mm measured at the rod. These measurements are downward travel until the pedal goes hard. You should have just a gnats cock free play at the master as well. I supect the combo valve could be the problem as 1" bore sounds ok for this system.

  7. #15
    Off the Xmas card list kapri's Avatar
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    So, 6:1 pedal ratio and the 10mm m/c travel says its sized well for your brake combo. Paul67 does have a good point though

  8. #16
    Official RnS Addict Bel Air Lugosi's Avatar
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    Well it seems I should have done this a long time ago. I lent my jack to someone, Thats why I havent tried this until today.

    I jacked up the front of the car and spun the wheels. I hit the brakes and nothing happened! Didnt stop the wheel, didnt even slow it down. Absolutely nothing.
    Am I to assume from this that the master cylinder needs bleeding?
    I bled the brakes when I first got them on the car. They seemed to shift fluid ok.
    What could have happened?
    If its low n black n shiny n sparkley n loud n spitting fire....... It's probably mine.
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  9. #17
    "call 0-800 Apocalypse" satan's Avatar
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    Quote Originally Posted by Bel Air Lugosi View Post
    Well it seems I should have done this a long time ago. I lent my jack to someone, Thats why I havent tried this until today.

    I jacked up the front of the car and spun the wheels. I hit the brakes and nothing happened! Didnt stop the wheel, didnt even slow it down. Absolutely nothing.
    Am I to assume from this that the master cylinder needs bleeding?
    I bled the brakes when I first got them on the car. They seemed to shift fluid ok.
    What could have happened?
    bad news paul, i,ve just had a roll call and i appear to be missing a demon,, its probably hiding in your brake system, is there a local priest you could call on,

    but seriously,, have you tried jacking the rears and see if they work? sounds like you got a faulty part in the system someplace, my guess would be that proportioning valve, so much of these parts are sourced from china these days,they are just crap.
    Last edited by satan; 22-06-2011 at 19:15.
    And I heard a voice in the midst of the four beasts, And I looked and behold: a pale horse. And his name, that sat on him, was Death. And Hell followed with him.

  10. #18
    Official RnS Addict Bel Air Lugosi's Avatar
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    Rear brakes are working. They are locking up whenever I stick me hoof on the pedal.
    im guessing this is why I have no feel to the pedal and keep on locking the back end.
    As the fronts should do most of the braking.

    The valve is only in the rear line, so it cant be that causing front brake fail.
    If its low n black n shiny n sparkley n loud n spitting fire....... It's probably mine.
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  11. #19
    Official RnS Addict beach57's Avatar
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    Clamp the rear flexi pipe and see if the fronts come on

  12. #20
    Global Warmer Paul Y's Avatar
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    Paul,

    Have you tried the obvious?

    Is there fluid getting to the front calipers?

    If you take the calipers off and get someone to push the pedal down slowly does the piston move?

    What happens if you pump the pedal a few times? Does the wheel then lock?

    I had a somewhat similar problem a few years back and it was due to the pistons sticking as the car had not been driven for a few months.

    P.
    Only those who will risk going too far...can possibly find out how far one can go." T S Elliot

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