400GT Brake booster - RHD vs LHD | FerrariChat
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400GT Brake booster - RHD vs LHD

Discussion in '365 GT4 2+2/400/412' started by Arvid, Oct 31, 2013.

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  1. Arvid

    Arvid Formula Junior

    May 28, 2012
    668
    Norway
    Full Name:
    Arvid Andersson
    #1 Arvid, Oct 31, 2013
    I suspect my brake booster has a vacuumleak or the membran is old and stiff. The pedal feels hard and unresponsive. Vacuumpump is ok,so are the hoses.

    I have sourced out some RHD cars for breaking but I'm not sure if I can use this booster in LHD car.

    Any idea if this part is the same on both Versions ?
     
  2. hoverland

    hoverland Formula Junior

    Aug 14, 2010
    265
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    Harald Ø
    #2 hoverland, Oct 31, 2013
    Looks like same
    Both have same pn 110792 at Eurospares

    H
     
  3. Ak Jim

    Ak Jim F1 Veteran
    Owner Rossa Subscribed

    Dec 23, 2007
    9,619
    North Pole AK
    #3 Ak Jim, Oct 31, 2013
    Just wondering, can it be rebuilt?
     
  4. rustytractor

    rustytractor Formula 3

    Mar 25, 2012
    1,078
    London
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    Russell Schacter
    #4 rustytractor, Nov 1, 2013
    Afraid I can't help with advice on the brake servo but wondered where in the world these RHD 400's are being broken and if any other parts were available as there are a few items I may need.

    Thanks,


    Russ
     
  5. Arvid

    Arvid Formula Junior

    May 28, 2012
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    Arvid Andersson
    #5 Arvid, Nov 1, 2013
    Ak Jim : Yes it can but no one near me. Needs to shipped overseas to someone familiar with these italian brakeboosters.

    Rustytractor : This guy in Germany has parts. I mailed him in his own language. Don't know if he speaks English : Sonstige Artikel im moto-mare Shop bei eBay!

    :)
     
  6. simonc

    simonc Formula Junior

    Nov 1, 2003
    884
    Herfordshire, UK
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    Simon Campbell
    #6 simonc, Nov 2, 2013
    Last edited by a moderator: Sep 7, 2017
    Do you mean the booster only or the booster/master cylinder together? The last time I bought one (for my RHD 400 Auto) it came with the master cylinder and this is different LHD & RHD as the holes for the pipes are in different positions. It may be possible to reroute the pipes but I am not sure if there is enough space between the master cylinder and heater to do this - I don't have my car hee to check it at the moment.

    I never used the new unit (long story) and I may still have it somewhere if you need it but I don't think it will fit a LHD car.
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  7. Arvid

    Arvid Formula Junior

    May 28, 2012
    668
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    Arvid Andersson
    #7 Arvid, Nov 2, 2013
    Thanks for great pictures. Now I can compare with my car. I think the servo is the same but the sylinder is probably different.

    I'll get back to you :)
     
  8. alastairhouston

    alastairhouston Formula Junior

    Apr 19, 2009
    575
    Largs Scotland UK
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    Alastair Houston
    #8 alastairhouston, Nov 3, 2013
    Hello Arvid
    Pretty sure you need the left hand drive because theres not enough space to fit otherwise with the hoses. Eurospares have them ime sure and its not a big job to fit.
    Its the same unit for 400s and other cars so you should get one from a younger car maybe testarossa or otherwise then it will be unlikely to fail. Eurospares test the secondhand units they have.
    Regards
    Alastair
     
  9. Arvid

    Arvid Formula Junior

    May 28, 2012
    668
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    Arvid Andersson
    #9 Arvid, Nov 4, 2013
    Thanks Alastair,

    There's another interesting point. Which other models use the same servo ? I've tried to compare pictures on parts sheets. Some looks like the same part but different part nr.,other differs in details (but could still fit,maybe...)

    Anyone know which models use the same servo ?
     
  10. Arvid

    Arvid Formula Junior

    May 28, 2012
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    Arvid Andersson
    #10 Arvid, May 6, 2014
    Last edited: May 6, 2014
    Well,I finally got the booster back from repair and anodizing. Looks like new,but... it was not the problem for my unresponsive brakes although it did lift the finish in the engine bay ;-)

    To make a short story long,I bought the car with bad brakes. The pads were old and worn and so were the discs. Naturally I bought new parts but it did not help at all. Also the pistons and calipers where checked. I then checked the vakuum,hoses and pump. All good. Next step was the booster since these may have an old and hard membran. This was unfortunatly not the problem either...

    Brakepedal is still to hard and needs plenty of force to stop the car effectively. What can be wrong ? Rotten brake hoses ? What about the pressure regulator/cylinder under the master cylinder (what is its purpose) ?

    Thanks,
    Arvid
     
  11. Schumi

    Schumi Formula Junior
    Owner Silver Subscribed

    Jun 5, 2002
    866
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    Daren
    #11 Schumi, May 6, 2014
    Have you checked the in-line valve (Ferrari Parts : 128435 VALVE : Ricambi America) to see if it is stuck in the closed position? I am not near my car to snap a photo, but this valve is located to the rear of the booster/servo and is held in place with a metal tab. Hope this helps.
     
  12. Arvid

    Arvid Formula Junior

    May 28, 2012
    668
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    Arvid Andersson
    #12 Arvid, May 7, 2014
    Hi Schumi,

    I'm aware of this valve. It is connected to the intake of one of the cylinders. I've disconnected it and checked that it has suction.

    I've puzzled over this. What is its purpose ? The pump creates vakuum for the booster and this valve also creates vakuum,though in pulses since it's connected on just one cylinder. Is it a back-up if the pump fails ?
     
  13. Schumi

    Schumi Formula Junior
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    Jun 5, 2002
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    Daren
    #13 Schumi, May 8, 2014
    I'm not sure of its purpose. There is a spring in there with a ball. I had similar issues to what you have described but my problem was the booster itself. I took this valve out on both sides and made sure I could blow through it before I sent my booster off.
    Your problem still sounds like a vacuum leak somewhere. Hope you get to the bottom of your problem soon.
     
  14. Allard54

    Allard54 Karting

    Dec 11, 2009
    123
    CT.
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    Marcel Perlman Ph.D.
    #14 Allard54, May 8, 2014
    The valve is a one- way check valve...the purpose ,I believe , is to hold the vacuum in the booster, otherwise it would flictuate. Having had a similar problem with an othe car I would check to see how much vacuum there is at the booster...a minimum of 15 is recommended also check to see if the push rod is traveling far enough to activate the booster....all the best, Marc
     
  15. galbert

    galbert Formula Junior

    Mar 14, 2012
    374
    sud ouest france
    Full Name:
    Galbert Christopher
    #15 galbert, May 8, 2014
    sur ma 400
    lorsque je freinais si je relâchais le frein et que je ré-appuyais il ne freinait plus .
    c'était la durite d'aide au freinage (système de dépression )qui était percée
    depuis j ai changé la durite avec une inox plus de problème
    amicalement
    christopher
     

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