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Thread: Electric Brake Boost

  1. #1
    Join Date
    May 2009
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    Electric Brake Boost

    My 300 tdi vacuum pump is playing up. It works fine above idle but at idle does not make vacuum.

    This is the second pump now that has done exactly the same thing and I am sick of replacing an item with another one that I know will fail again.

    So I am looking at the electric option. There are plenty of threads on this topic which I have read, but I am thinking slightly different.

    The fact that mine works ok above idle, I was thinking of getting a cheap pump and running it in parallel with the original pump.

    As the original works ok above idle the electric would only be needed at idle, therefore the electric would not run very much.

    The fact that it would not run much would suggest that an eBay cheaply would suffice.

    Would this work? Can anyone offer up input as to why it wouldn't work?

    Would I need to put check valves on both pumps?
    Dave.

    I was asked " Is it ignorance or apathy?" I replied "I don't know and I don't care."


    1983 RR gone (wish I kept it)
    1996 TDI ES.
    2003 TD5 HSE
    1987 Isuzu County

  2. #2
    Join Date
    Jul 2011
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    Yarrawonga, Vic
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    Oiling the pump will help, failing that If it were me I'd be installing a vacuum tank. An old fire extinguisher works well.

  3. #3
    Join Date
    May 2009
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    Tatura, Vic
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    How do l oil it? I'm guessing oil down the vacuum port yes?
    If so how much?
    Dave.

    I was asked " Is it ignorance or apathy?" I replied "I don't know and I don't care."


    1983 RR gone (wish I kept it)
    1996 TDI ES.
    2003 TD5 HSE
    1987 Isuzu County

  4. #4
    Join Date
    Jul 2011
    Location
    Yarrawonga, Vic
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    just pull any vacuum hose and a squirt of engine oil should reinvigorate it. it might take a while to travel down the hose depending how far from pump

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