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SP 1000 1979 rear brake not building up pressure

Discussion in 'Loop & Tonti' started by Milan Willems, Sep 21, 2020.

  1. Milan Willems

    Milan Willems Just got it firing!

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    Location:
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    Hello guzzi tech forum!

    I'm having problems with my rear brakes.
    It's not building up real pressure.

    One bleeder screw was broken, but I can't find a real fitting replacement. I've put in another that kind of fits, but I'm not sure it does. It doesn't leak, but maybe it's letting in air?
    Anyone know where / how I can find the correct bleeder screw (rear brakes / rear pressure devider) in Belgium (or online of course)? I only seem to find them for the front brakes -> GU17659260.
    https://www.motorcyclespareparts.eu/en/piaggio-parts/gu17659260

    If this isn't the problem, I'm going to try to find a revision kit for the rear brake pump. I could maybe sure some help with this too.. To make sure I'm buying the correct revision kit.
    I found the following using this part number GU17659350 :
    https://www.motobel.fr/v35c-350-1982-1986-chassis/778-kit-reparmaitre-cylindre-ps15.html
    http://www.mgcycle.com/index.php?main_page=product_info&products_id=753
    https://wendelmotorraeder.de/repair-kit-ps15_gu17659350-w1-p-1042636.html?language=en

    Thanks in advance!!

    Milan Willems
     
  2. john zibell

    john zibell Moderator Staff Member GT di Razza Pura

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    Milan Willems likes this.
  3. Milan Willems

    Milan Willems Just got it firing!

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    Thank you so much for those websites! That's going to help a lot!
    I'm going to order the nipples and look into replacing the rear master.
    I'm wondering why the dutch website didn't showed up in my google searches... But thanks a lot!
     
  4. David Williams

    David Williams Just got it firing!

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    I have a G5 1980, and a 1987 LeMans 4, I have fought for years trying to get a solid link break feel on the two of them. the first issue was the stop on the rear brake pedal was not allowing for a full stroke on the master cylinder of the LeMans, make sure you are getting a full stroke. The fix I have found for both front and rear brake systems is to get them pumped up as much as possible and then bungie them down as hard as possible and leave it alone for at least 24 hours then come back and try it and repeat as necessary till you get a solid feel, no bleeding required. for the last few years I have enjoyed the best brakes ever (well, as good as you can get from a Brembo F08).
     

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