Rear brake pedal dropping
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  • 2 Post By TheDuck

Thread: Rear brake pedal dropping

  1. #1

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    Rear brake pedal dropping

    Anyone had an experience like this on a BB. Noticed accasionally when I'm sitting in traffic on a slight incline & sitting up on the & just on the rear brake the pedal drops away for a moment. Never had a problem with the brakes at all when riding only seems to be doing this when I'm sitting up waiting at lights and leaning on the rear brake stationary... Thinking maybe master cylinder seal possibly allowing pressure to pass by?
    Cheers if anyone else might have had this and corrected it.


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    Last edited by Ozblackbird; 04-19-2017 at 1:01 AM.

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  3. #2

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    Re: Rear brake pedal dropping

    No answer yet but this will keep you busy for a bit. The fluid from the rear master cylinder does a lot through a lot of components!
    DCBS Front.PNG DCBS Rear.PNG

  4. #3
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    Re: Rear brake pedal dropping

    The only time I have experienced this was when I hadn't got all the air out of the system after replacing a couple of lines in my garage.
    Can you replicate this problem if you just sit on the bike and press the pedal when you are at home?
    Full of Hot air? Intercool yourself............ you know it makes sense

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  6. #4

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    Re: Rear brake pedal dropping

    Quote Originally Posted by Ausblackbird View Post
    No answer yet but this will keep you busy for a bit. The fluid from the rear master cylinder does a lot through a lot of components!
    DCBS Front.PNG DCBS Rear.PNG
    Jesus that does look complicated as I had thought.. Duck might be interested onto something I know the guys at the shop had trouble bleading it at one stage but not had any spongey type of brake pedal or lever when riding. Just seems to happen when sitting on the rear brake will try at home to see if it doest it as might be when on the pedal for a period of time.
    Thanks guys


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  7. #5
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    Re: Rear brake pedal dropping

    Yes the system looks complicated but once you get your head around it it's not that complicated.

    The reason I suggested trying it at home is because when you have been out on the road the secondary master cylinder will have been operating the two outer pistons in the rear caliper (when you operated the front lever in order to pull up). When you are at home any pressure in the secondary master cylinder circuit should have released ..... so when you operate the pedal you should only be putting noticeable pressure to the centre piston so any extra travel, sponginess or dropping can be isolated to that circuit (not 100% perfect check but not bad) .... and if you can't replicate the problem it lies in the other circuit, which is usually the case.

    For either case a good bleed of the system works* ensuring you follow the order given in the Honda Manual Honda CBR 1100XX Service Manual 1999+ but knowing which bleed nipple you expect to see a big gob of air to come out of in advance is a real help.

    *assuming there are no failed components
    Ausblackbird and Ozblackbird like this.
    Full of Hot air? Intercool yourself............ you know it makes sense

  8. #6

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    Re: Rear brake pedal dropping

    Quote Originally Posted by TheDuck View Post
    Yes the system looks complicated but once you get your head around it it's not that complicated.

    The reason I suggested trying it at home is because when you have been out on the road the secondary master cylinder will have been operating the two outer pistons in the rear caliper (when you operated the front lever in order to pull up). When you are at home any pressure in the secondary master cylinder circuit should have released ..... so when you operate the pedal you should only be putting noticeable pressure to the centre piston so any extra travel, sponginess or dropping can be isolated to that circuit (not 100% perfect check but not bad) .... and if you can't replicate the problem it lies in the other circuit, which is usually the case.

    For either case a good bleed of the system works* ensuring you follow the order given in the Honda Manual Honda CBR 1100XX Service Manual 1999+ but knowing which bleed nipple you expect to see a big gob of air to come out of in advance is a real help.

    *assuming there are no failed components
    Thanks so much once again I will give that a shot.


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  9. #7
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    Re: Rear brake pedal dropping

    Let us know how it goes ....
    Full of Hot air? Intercool yourself............ you know it makes sense


 

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