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Thread: Bleedless Way to Restore Lost Pressure on Rear Brake

  1. #1
    Baby Twin vermicious's Avatar
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    Bleedless Way to Restore Lost Pressure on Rear Brake

    I got this tip from Motostrada in Cockeysville, MD... presumably, they in turn got it from Aprilia.

    Basically, all you do is hang a moderately heavy item (can of paint, jug of water) from the rear brake lever over night. I can verify from first-hand experience that this eliminates (for a while anyway) the mushy feeling that, over time, can creep into the rear brakes on the Tuono.

  2. #2
    OldTLSDoug
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    It is best just to bleed the thing the way Aprilia recommends and it is fixed for good.

    Here is a good link to the Aprilia Service Bulletin on how to do it. I highly recommend it, worked perfectly on mine. 2000 miles without any issues.

  3. #3
    Baby Twin
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    I have tried the reccommended bleeding method & so has the dealer, neither lasted too long.
    The best remedy I have found is to hang a weight off the brake lever over night as described above.

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    GP Champ Tifa's Avatar
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    Wink if only life (and tuono ownership) were that simple..

    Quote Originally Posted by OldTLSDoug View Post
    It is best just to bleed the thing the way Aprilia recommends and it is fixed for good.
    *all together now*

    "...oh no it isn't..."




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    GP Champ Tifa's Avatar
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    Quote Originally Posted by OldTLSDoug View Post
    It is best just to bleed the thing the way Aprilia recommends and it is fixed for good.
    ahhhh...if life were that simple.

    there are those who have done this subject to death, unfortunately, some bikes are virtually impossible to sort.

    mine:

    bled several times by my Ape dealer
    bled 2 times by my mates Ape dealer
    bled several times by myself with a mitivac, following Kirks (Kzmille) instructions to the absolute letter
    Caliper & m/c stripped down twice
    High temp fluid installed
    Heat shield installed

    Always ok for 3-500 miles, then it "goes off"

    The overnight weight on the pedal method works fine until you want to do in excess of 500 miles...

    Despite what Aprilia/Brembo say...there ARE unresolved issues with that rear brake

  6. #6
    GP Champ Tifa's Avatar
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    Quote Originally Posted by OldTLSDoug View Post
    It is best just to bleed the thing the way Aprilia recommends and it is fixed for good.

  7. #7
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    Old post I know but there must be something about Brembo brakes as two KTM EXC dirt bikes i owned would loose there front brakes if stood for a couple of weeks or so,no fluid loss or anything just no brake,all I used to do was push the pistons back in the calliper with a large screwdriver and braking was restored,tried bleeding,sucking the fluid through at different times but the problem came back,and not just on my KTM either,must be a Brembo thing

  8. #8
    WSB Pit boss Aldo's Avatar
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    Same here B, lost the rear brake on my ktm exc and the only way I could get the pressure back was to crack the connection at the banjo bolt on the top of the m/c.

    The front brake went the same way months later but was easily restored.

    I use the rear brake on my T at every opportunity and it sort of works, not well but enough to stop you from slow speeds.

  9. #9
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    Quote Originally Posted by Aldo View Post
    Same here B, lost the rear brake on my ktm exc and the only way I could get the pressure back was to crack the connection at the banjo bolt on the top of the m/c.

    The front brake went the same way months later but was easily restored.

    I use the rear brake on my T at every opportunity and it sort of works, not well but enough to stop you from slow speeds.
    Its bizarre really,if the fluid was leaking or something you could understand it happening

  10. #10
    One Litre Duc Eater Fugly's Avatar
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    Apparantly rearsets allegedly fix the issue but am sure someone will be along to discount this theory

  11. #11
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    Quote Originally Posted by Fugly View Post
    Apparantly rearsets allegedly fix the issue but am sure someone will be along to discount this theory
    I have a road reg YZ250 fitted with Nissin brakes and that never does it no matter how long its stood

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    WSB Pit boss Aldo's Avatar
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    Quote Originally Posted by Fugly View Post
    Apparantly rearsets allegedly fix the issue but am sure someone will be along to discount this theory
    Aye F, that seems to be the only permanent fix.

    Those that have fitted them always have a working rear brake.

  13. #13
    AMA Pit Boss garry's Avatar
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    i got told a proper fix is to swap over the cylinder to a ducati one, so thats what i did.

    and mines been fine ever since.

  14. #14
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    Quote Originally Posted by Aldo View Post
    Aye F, that seems to be the only permanent fix.

    Those that have fitted them always have a working rear brake.
    Do rear sets alter the angle of the cylinder ?

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    WSB Pit boss Aldo's Avatar
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    Quote Originally Posted by garry View Post
    i got told a proper fix is to swap over the cylinder to a ducati one, so thats what i did.

    and mines been fine ever since.
    Aye g, yers is a Duc indeed,,,,,,,,,,,fookin Fud.

  16. #16
    WSB Pit boss Aldo's Avatar
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    Quote Originally Posted by Blade View Post
    Do rear sets alter the angle of the cylinder ?
    Aye B, it goes from horizontal to vertical.

  17. #17
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    Quote Originally Posted by Aldo View Post
    Aye B, it goes from horizontal to vertical.
    Seems odd that cures the problem,you would think Brembo were the dogs

  18. #18
    WSB Pit boss Aldo's Avatar
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    I've read a big thread on the AF1 site about why it happens.

    I think abod that knows aboot cavitation would see a reason.

    But that's jist my take on why.

    Bottom line is, if yer need a back brake fit rearsets.

  19. #19
    Evil Twin
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    We need a back brake and Aprilia should do a product recall and replace the whole unit with a working one, it's their problem as they engineered it.

  20. #20
    WSB Pit boss Aldo's Avatar
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    Quote Originally Posted by Ric Flair View Post
    We need a back brake and Aprilia should do a product recall and replace the whole unit with a working one, it's their problem as they engineered it.
    Apart from not liking the front end of the v4 T, coupled with my love of the v2 power delivery.

    I'll never buy another Aprilia,,,,,,,,,,,,,,,they couldn't give a fuckin toss.

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