11BL rear brake banjo unions!
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Thread: 11BL rear brake banjo unions!

  1. #1
    1000+ Posts gerrypro's Avatar
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    Default 11BL rear brake banjo unions!

    Hello everyone. I have struck a problem getting the rear wheel banjo unions on my 11BL restoration to seal. I have new copper seals from CTAand have tried many times to achieve a leak free installation. I have annealedthe seals to soften them so that they can better conform to any smallirregularities on the seal surface of the banjo union and still they leak. Theleak is very slight but after sitting over night there is enough to form a driphanging from the underside of the union. In desperation I have ordered another set of seals and two new unions from CTA. I hope that this will fix theproblem.
    Yes, I have checked the integrity of the bleed screw and they are sealing properly.
    In the past all my experience has been with Slough built cars. They use different British sourced plumbing components for the brake lines and unions.Therefore this is a bit of a surprise to me.
    Does anyone have some knowledgeable advice to help solve my problem. I am using Dot 5 fluid but I cannot see that this would make a difference..
    Cheers Gerry

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    Cheers Gerry

  2. #2
    1000+ Posts robmac's Avatar
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    Personally, I'd sparing use some Loctite 569 Hydraulic thread sealer

    Features

    High strength and fast cure

    Special grades for sealing and locking fittings on hydraulic, pneumatic and fuel systems against the effects of vibration, shock and thermal cycling

    Contains no particles to foul valves and other fine orifices

    Excellent resistance to fuel, hydraulic fluids and chemicals

    Temperature range: -55įC to +150įC
    EDIT:
    FWIW I've used 569, for the off label application, of sealing troublesome air conditioning flare joints and have never experienced a problem. I just put two drops on the flare surface.
    Last edited by robmac; 27th May 2018 at 02:24 PM.
    Mutual Respect is Contagious


  3. #3
    1000+ Posts gerrypro's Avatar
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    Quote Originally Posted by robmac View Post
    Personally, I'd sparing use some Loctite 569 Hydraulic thread sealer



    EDIT:
    FWIW I've used 569, for the off label application, of sealing troublesome air conditioning flare joints and have never experienced a problem. I just put two drops on the flare surface.
    Thanks for the heads up Rob. This may be better than the Loctite 518 that was recommended by a contributor to the Yahoo TA-L group!
    I'll give it a go. Is it easy to obtain?
    Cheers Gerry

  4. #4
    1000+ Posts robmac's Avatar
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    Quote Originally Posted by gerrypro View Post
    Thanks for the heads up Rob. This may be better than the Loctite 518 that was recommended by a contributor to the Yahoo TA-L group!
    I'll give it a go. Is it easy to obtain?
    Any hydraulic parts supplier or places like bearing service, SKF bearings, etc etc.

    Not cheap and I've never seen in the small bottle.

    518 is probably good at sealing too, however Loctite sell it as gasket sealant.

    I be a worried about particles getting into the hydraulic system.
    Mutual Respect is Contagious


  5. #5
    1000+ Posts gerrypro's Avatar
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    Quote Originally Posted by robmac View Post
    Any hydraulic parts supplier or places like bearing service, SKF bearings, etc etc.

    Not cheap and I've never seen in the small bottle.

    518 is probably good at sealing too, however Loctite sell it as gasket sealant.

    I be a worried about particles getting into the hydraulic system.
    The last line echoes my concerns!
    Cheers Gerry

  6. #6
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    Perhaps, trial fit the banjo bolt sans banjo and ensure it's not bottoming out and then never really tightening properly?
    gerrypro likes this.

  7. #7
    1000+ Posts gerrypro's Avatar
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    Quote Originally Posted by David S View Post
    Perhaps, trial fit the banjo bolt sans banjo and ensure it's not bottoming out and then never really tightening properly?
    David that is a possibility that I had not considered! Thank you! I had dressed the faces of the union to make sure there were no pits or indents. I do not think that I took too much off, but it is worth investigating.
    Cheers Gerry

  8. #8
    1000+ Posts robmac's Avatar
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    I do not think that I took too much off
    Even if you have, it's not terminal.

    A steel washer under the head of the banjo bolt (ie on top of the copper washer) will soon sort out the problem.

    I'm with you, I prefer to see things work as the manufacturer intended.
    Mutual Respect is Contagious


  9. #9
    Fellow Frogger! citroenthusiast's Avatar
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    Quote Originally Posted by gerrypro View Post
    Thanks for the heads up Rob. This may be better than the Loctite 518 that was recommended by a contributor to the Yahoo TA-L group!
    I'll give it a go. Is it easy to obtain?
    Where is this Yahoo TA-L group? Can you send me a link please? I tried using Yahoo's (useless) "search groups" function to no avail....
    Cheers,
    John T.

    54 TAV Legere; 61DS19 LHM BVH (son's); 71DS21 BVH; 73SM 3.0; 73SM EFI (Megasquirt); 73SM 3.0 (other son's)

  10. #10
    1000+ Posts gerrypro's Avatar
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    https://groups.yahoo.com/neo/groups/TA-L/info
    First you will need to login to yahoo, or register if you have not done so already. Then you can join your favourite groups. There are groups for GS and DS and CX also!
    Cheers Gerry

  11. #11
    Fellow Frogger! citroenthusiast's Avatar
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    Thanks. I am a regular contributor to the DSeries-L and the Sport-Maserati-L group. I just couldn't find the TA group.
    Cheers,
    John T.

    54 TAV Legere; 61DS19 LHM BVH (son's); 71DS21 BVH; 73SM 3.0; 73SM EFI (Megasquirt); 73SM 3.0 (other son's)

  12. #12
    1000+ Posts gerrypro's Avatar
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    Yes sometimes their posts are a little intermittent!
    Cheers Gerry

  13. #13
    1000+ Posts gerrypro's Avatar
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    Quote Originally Posted by robmac View Post
    Even if you have, it's not terminal.

    A steel washer under the head of the banjo bolt (ie on top of the copper washer) will soon sort out the problem.

    I'm with you, I prefer to see things work as the manufacturer intended.
    I do not think the solution with the steel washer will work. Just another point of potential leakage
    I have decided to bite the bullet and have ordered two new Banjo unions from CTA and another set of new seals. These arrived today and I guess I will know if this solution worked by the end of the day.
    Examining the new units in comparison with the old, the standard of finish is much better . The seal faces of the old exhibit circular marks from the machining where as the new are very finely finished and smooth.
    Cheers Gerry

  14. #14
    1000+ Posts robmac's Avatar
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    An all out fix for those with a suitable budget, however guaranteed to work.
    Mutual Respect is Contagious


  15. #15
    1000+ Posts gerrypro's Avatar
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    Quote Originally Posted by robmac View Post
    An all out fix for those with a suitable budget, however guaranteed to work.
    I have done that job Rob and so far so good! I am keeping my fingers crossed.
    Cheers Gerry

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    Too many posts! JohnW's Avatar
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    Quote Originally Posted by gerrypro View Post
    David that is a possibility that I had not considered! Thank you! I had dressed the faces of the union to make sure there were no pits or indents. I do not think that I took too much off, but it is worth investigating.
    Have you tried two copper washers instead of one? Just a thought....
    JohnW

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