Unable to bleed Front Right Caliper on a 360

Discussion in 'Technical Q&A' started by AleGJ, Jun 13, 2018 at 4:39 PM.

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  1. AleGJ

    AleGJ Rookie
    Silver Subscribed

    Feb 1, 2014
    41
    North Italy
    Hi everyone.
    Last month I was out for a drive with my 360 when I realized that the front right caliper (well at least one piston I would say) seized in the closed position.
    So, bad smell of brakes and of course the front right brake overheated.
    It overheated so much that the heat melted the wheel plastic center cap:

    [​IMG]

    After removing the wheel I was able to separate the pads from the caliper and so I could drive (carefully) back home.

    Once home I took off the caliper in order to inspect it, and this is what I found:

    [​IMG]

    As you see one of the dust seal was in pretty bad shape. I then decided to have all four calipers repainted and completely refurbished.

    The company that did the job said that apart that bad dust seal everything looked in not so bad shape.

    I put them on the car today, fitted new pads, and then bled the system using my pressure bleeder.

    Everything went smooth as usual, except the front right.

    It's simply impossible to bleed it. Nipples open, pressure in the system, but nothing. I tried also the old fashion way pumping the brake pedal but it feels heavy, like the nipples are still closed.
    And the pistons are not moving at all.

    All the other three are working normally.

    I bought the car 2 and a half years ago and it had a full service before delivery, brake fluid included. I checked the reservoir in my pre-purchase inspection and was super clean, with nice and fresh fluid.
    It was the same now that I installed the refurbished calipers.

    Any ideas? It's several years that I'm doing maintenance on my cars, but 've never seen something like that before.
    It's frustrating, because a brake system is something quite simple, and I have no idea how to solve the issue..
     
  2. mello

    mello Formula 3
    Silver Subscribed

    Jul 12, 2013
    1,495
    California
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    Steve
    Swollen rubber on brake lines?
     
  3. flash32

    flash32 Formula Junior

    Aug 22, 2008
    623
    Central NJ
    Full Name:
    Dominick
    Or cooked fluid blocking in hose ..or combo or both rubber deformed and cooked fluid

    Sent from my Moto G (4) using Tapatalk
     
    Dave rocks likes this.
  4. phil99

    phil99 Rookie

    Feb 26, 2015
    19
    Wellington, NZ
    Full Name:
    Phil S.
    I also suggest checking that the brake hose isn't blocked- just loosen it and see if any fluid comes out there. After hearing about this, but never witnessing it, I have had it happen to me twice in the last year. In both cases the hoses weren't that old and looked perfect from the outside. In the first case, the hose was almost completely blocked but some fluid could get through- the brake seized on and as things got hotter, it only grabbed tighter. Not impossible this was the cause of all your problems.

    Could also be a blocked bleed nipple- but aren't there two of them? In which case unlikely.

    Good luck,
    Phil
     
  5. Motob

    Motob Formula 3
    Professional Ferrari Technician

    Nov 11, 2003
    1,638
    Berkeley, CA
    Full Name:
    Brian Brown
    It is very common for the brake hoses to clog. If one is bad, I would replace all four. Also check the flow through the bridge pipes between the brake caliper halves, as these also clog up. The original Shell brake fluid was blamed as a possible cause, especially if is is not flushed annually. I would use a good quality fluid and flush it every year. Brake fluid is cheap.
     
    ///Mike likes this.
  6. AleGJ

    AleGJ Rookie
    Silver Subscribed

    Feb 1, 2014
    41
    North Italy
    First of all thank you all for the inputs.
    I would tend to exclude the caliper as they have been just stripped down, rebuilt and tested.

    My biggest fear actually is the ABS Modulator, because I know it's prone to fail. But wouldn't the symptoms be different?

    You are pointing out a clogged hose (that makes sense and that is something that I considered as well).
    But are you speaking about the rubber section only? Or even the hard lines that comes from the ABS Modulator can clog? I mean, what is more common?

    [​IMG]
     
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  8. ///Mike

    ///Mike F1 Veteran
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    Dec 11, 2003
    5,901
    Bugtussle
    Rubber lines have a finite life. It is the most likely failure point. Brian's advice is excellent: replace them all.
     
  9. hessank

    hessank Formula Junior
    Rossa Subscribed

    Aug 8, 2005
    861
    Canada
    Full Name:
    Fred
    +1
    I would also invest in the SS version (longer life and less expansion
     
    ///Mike likes this.
  10. ///Mike

    ///Mike F1 Veteran
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    Dec 11, 2003
    5,901
    Bugtussle
    Agreed. Specifically, Goodridge.
     
  11. vincep99

    vincep99 Formula 3
    Silver Subscribed Owner

    Jun 8, 2009
    1,543
    I had a bad (collapsed) rubber brake line on my Vette, and it acted like a one-way check valve: it held the pressure on the caliper. Cooked the caliper just like yours
     
  12. MerlinTech

    MerlinTech Karting
    Sponsor

    Mar 5, 2010
    205
    Georgia
    Full Name:
    Wade Williams
    Happens all the time. I change all four rubber lines on any car that I find has an issue on one wheel. Also, that is why it smoked a caliper to begin with. The master cylinder can produce hundreds of pounds of pressure but the caliper can not on the return side so the pressure stays and smokes the caliper, pads, and sometimes rotor if run too long.
    Four new rubber lines and if the outside bleeder does not flow well, pull the lower crossover line (it is steel brake line) and clean it out. I know OP had his rebuilt and it won't be an issue, but anyone else checking in with this issue later will need to know that.
     
  13. AleGJ

    AleGJ Rookie
    Silver Subscribed

    Feb 1, 2014
    41
    North Italy
    Thank you all guys for the replies.

    Actually I was thinking about the brake line as well, but I was fearing something bad with the ABS modulator (even if the behaviour was not what I was expecting from a shot ABS modulator).

    Of course I'm gonna replace all four with braided lines, I'll let you know the outcome then!


    Sent from my iPad using FerrariChat.com mobile app
     
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