97rear brake locking up
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  • 1 Post By CBRDEAN0
  • 3 Post By CBRDEAN0

Thread: 97rear brake locking up

  1. #1

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    97rear brake locking up

    hi guys
    just finishing off the bike and re bleeding the brakes
    front mains and secondaries are now fine no dragging
    rears as being problematic
    they were dragging a little and i decided to re bleed after doing a primary bleed some days ago with no issues
    bled the front middle nipple both sides no issue
    bled the rear middle nipple via the rear pedal no issues
    bled the rear end nipple and pushed hard on the pedal and then it locked up
    if i release the pressure by cracking open the nipple then all is well
    if i use the rear pedal again then it locks up hard and will not release
    have i b---ered something up or is the rear proportion valve stuck closed?
    or ?
    thanks for your input
    paul

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  3. #2

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    Re: 97rear brake locking up

    Sounds like the small one way valve in the side of the SMC on the left fork leg has got blocked.
    This is what allows the rear brake to release after application.
    P1010764.JPG
    Ausblackbird likes this.

  4. #3

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    Re: 97rear brake locking up

    DITTO!!!
    Quote Originally Posted by CBRDEAN0 View Post
    Sounds like the small one way valve in the side of the SMC on the left fork leg has got blocked.
    This is what allows the rear brake to release after application.
    P1010764.JPG

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  6. #4

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    Re: 97rear brake locking up

    hi Abb
    I took the blasted thing apart and managed to extract the pressed it filter assy by hooking into the gauze ( thus damaging it ) the main part seems ok
    the tiny relief hole seemed to be obturated and i finally mananged to wiggle a tiny bowden wire and clear the hole
    if i hadn't removed the filter id have never solved this issue
    i looked on the Honda parts list and of course the filter assy is not listed
    so
    where can i find it?
    cheers
    paul

  7. #5

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    Re: 97rear brake locking up

    unfortunately it's not available as a separate part. You may be able to source a secondhand part. How bad is it?

    Quote Originally Posted by cbrpaul View Post
    hi Abb
    I took the blasted thing apart and managed to extract the pressed it filter assy by hooking into the gauze ( thus damaging it ) the main part seems ok
    the tiny relief hole seemed to be obturated and i finally mananged to wiggle a tiny bowden wire and clear the hole
    if i hadn't removed the filter id have never solved this issue
    i looked on the Honda parts list and of course the filter assy is not listed
    so
    where can i find it?
    cheers
    paul

  8. #6

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    Re: 97rear brake locking up

    Quote Originally Posted by cbrpaul View Post
    hi Abb
    I took the blasted thing apart and managed to extract the pressed it filter assy by hooking into the gauze ( thus damaging it ) the main part seems ok
    the tiny relief hole seemed to be obturated and i finally mananged to wiggle a tiny bowden wire and clear the hole
    if i hadn't removed the filter id have never solved this issue
    i looked on the Honda parts list and of course the filter assy is not listed
    so
    where can i find it?
    cheers
    paul
    Where in the world are you Paul ?

  9. #7

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    Re: 97rear brake locking up

    belgium near the airport
    ive sorted that out and the rear wheel is now free and everything worked until the blasted secondary " exploded " under full pedal pressure and peed brake fluid all over the lhs of the front wheel
    i guess the dinky circlip holding in the main seal was not fully seated but the access and visibility is so poor you cannot be sure
    lucky it was a static test and not on the road
    ill try to re seat it if its still wonky ill buy and 2nd hand and ask the gods that is not be blocked like mine was
    in the eu the 2nd hand secondaries are few
    now i begin to see why so many throw in the towel and de link
    i dynamically tested my red one with full pedal pressure and its magic .... when it works
    level braking and no skidding

  10. #8

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    Re: 97rear brake locking up

    Quote Originally Posted by cbrpaul View Post
    belgium near the airport
    ive sorted that out and the rear wheel is now free and everything worked until the blasted secondary " exploded " under full pedal pressure and peed brake fluid all over the lhs of the front wheel
    i guess the dinky circlip holding in the main seal was not fully seated but the access and visibility is so poor you cannot be sure
    lucky it was a static test and not on the road
    ill try to re seat it if its still wonky ill buy and 2nd hand and ask the gods that is not be blocked like mine was
    in the eu the 2nd hand secondaries are few
    now i begin to see why so many throw in the towel and de link
    i dynamically tested my red one with full pedal pressure and its magic .... when it works
    level braking and no skidding
    Yep - have known a couple of people have the same issue.
    Look carefully at the circlip - one side of it has a sharper edge than the other.
    make sure the sharper edge is outermost when assembled so it can lock in to the groove better.
    Punts, TheDuck and iXXion like this.

  11. #9
    Supercharged Mod
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    Re: 97rear brake locking up

    Quote Originally Posted by CBRDEAN0 View Post
    Look carefully at the circlip - one side of it has a sharper edge than the other.
    make sure the sharper edge is outermost when assembled so it can lock in to the groove better.
    Great advice, bizarrely I had just put similar on another thread before I got to this one! https://www.cbrxx.com/general-cbr-xx...tml#post638045
    Full of Hot air? Intercool yourself............ you know it makes sense


 

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