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Thread: Brake Oil is Leaking!

  1. #1
    Legendary dom14's Avatar
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    Brake Oil is Leaking!

    Hi Guys,

    I just discovered the my RB30 PATROL needs some attention with the brake plumbing system.
    Apparently there's a leak between the master pump and the brake booster.
    The oil is visible on the brake booster body behind the brake master pump, and has been slowly dripping down the booster outer body towards bottom end of the engine bay. It's not gushing oil out, but still bad enough to cause the brake warning light to come one on when I brake suddenly or take sharp bends.
    I topped up the brake oil on the master pump for the time being.

    What is the likely cause?
    How should I approach on fixing the oil leak?

    Thanx in advance for any advice, help, etc.
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    Last edited by dom14; 28th June 2016 at 05:06 PM.
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    Legendary 4bye4's Avatar
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    Check out the price for a master cylinder kit from vendors on this site or eBay. Don't let it go or it may fail completely and suddenly.


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    Patrol Freak Wine_maker's Avatar
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    Hi!

    I have had the same situation when the cap of brake master cylinder where broken.
    Check the cap firstly.
    I'm Alexander and I'm the happiest owner of GQ Nissan Safari in the whole Central Asia

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    Legendary dom14's Avatar
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    I gave it a wash and checked to see whether it's still leaking, but it I can't see any oil marks yet.
    It's a very slow leak by the looks of it. Touching around the joint between booster and master cylinder
    didn't produce any oil residue on my fingers.

    I'm wondering,
    Is there a way to fix this by replacing a(the) seal between master cylinder line between the booster &
    the master cylinder?!!!
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    Last edited by dom14; 28th June 2016 at 05:04 PM.
    RB30, some 2-3 inch lift auxiliary LPG tanks
    Few more mods on the way
    http://www.worldwildlife.org/species/tiger
    https://www.panthera.org/
    Cheetah Outreach

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    Travelling Podologist Cuppa's Avatar
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    If hes not too tied up in Kalgoorlie at the moment I think Pearcey is the man to advise on this.

    @pearcey

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    Legendary dom14's Avatar
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    Quote Originally Posted by Cuppa View Post
    If hes not too tied up in Kalgoorlie at the moment I think Pearcey is the man to advise on this.

    @pearcey
    Thanx mate.

    I sent him a PM, Hopefully, he's in an area where he can receive it.

    Cheers

    Dom.
    RB30, some 2-3 inch lift auxiliary LPG tanks
    Few more mods on the way
    http://www.worldwildlife.org/species/tiger
    https://www.panthera.org/
    Cheetah Outreach

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    Patrol Freak
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    G`day Dom
    Sorry this is a bit late but I`m in the middle of WA and the coverage is sparse.
    Looking at your problem,the master cylinder is leaking past the rear seal.
    I would suggest that a new cylinder be fitted,(yes kits are available, but if the bore is damaged in any way they should not be honed as there is a corrosive resistant coating and this is removed when honed) There are companies that fit stainless steel sleeves to the bore but these do wear out over time, but are a very good alternative to a new one (depending on price)
    Personally I would fit a new one as it should last at least 7+years
    Hope this is some help.

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    Col.T (11th July 2016), dom14 (7th July 2016)

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    Legendary dom14's Avatar
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    Quote Originally Posted by pearcey View Post
    G`day Dom
    Sorry this is a bit late but I`m in the middle of WA and the coverage is sparse.
    Looking at your problem,the master cylinder is leaking past the rear seal.
    I would suggest that a new cylinder be fitted,(yes kits are available, but if the bore is damaged in any way they should not be honed as there is a corrosive resistant coating and this is removed when honed) There are companies that fit stainless steel sleeves to the bore but these do wear out over time, but are a very good alternative to a new one (depending on price)
    Personally I would fit a new one as it should last at least 7+years
    Hope this is some help.
    Thanx pearcey.
    I gave it a good wash last week and have been monitoring it since then.
    I'm yet to see or feel any leaking oil from where it showed the leakage.
    I'm picking up a new one anyway.
    I'm thinking about waiting to see how long it takes to see the leakage.
    Also keeping an eye on oil level. I put a mark on the reservoir so I can notice it easily.
    Cheers
    Dom
    RB30, some 2-3 inch lift auxiliary LPG tanks
    Few more mods on the way
    http://www.worldwildlife.org/species/tiger
    https://www.panthera.org/
    Cheetah Outreach

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    Expert Col.T's Avatar
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    G'day fellas,
    not much to say after Pearcey's reply but having had, over the years about God knows how many leaking brake master cylinders, they show up in the strangest of places.
    Really, the sums are simple. If you're losing brake (or clutch) master fluid look for the leak, as you've done Dom.
    Anywhere up high, it's the master, anywhere down low it's the slave.
    New replacement usually was emy choice but regardless, do something as it will only get worse.
    Rgards,
    Col

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    Legendary dom14's Avatar
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    Quote Originally Posted by Col.T View Post
    G'day fellas,
    not much to say after Pearcey's reply but having had, over the years about God knows how many leaking brake master cylinders, they show up in the strangest of places.
    Really, the sums are simple. If you're losing brake (or clutch) master fluid look for the leak, as you've done Dom.
    Anywhere up high, it's the master, anywhere down low it's the slave.
    New replacement usually was emy choice but regardless, do something as it will only get worse.
    Rgards,
    Col
    Thanx mate. Yes, that's what I'm doing. I'm replacing it, as it's not worth the trouble trying to rebuild them.
    RB30, some 2-3 inch lift auxiliary LPG tanks
    Few more mods on the way
    http://www.worldwildlife.org/species/tiger
    https://www.panthera.org/
    Cheetah Outreach

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