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  1. #1
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    Jul 2014
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    How much brake fluid do I need to fill my system?

    Hi chaps, just looking to get some brake fluid to fill my brake system.

    Generally how much (and which is best) should I need?

    Thanks.

    Cheers,
    Stu
    AK427 Gen III, Ford 347, TKO600
    Build Blog:- stu238-ak427.blogspot.co.uk

  2. #2
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    Depends how quickly you manage to get all the air out.
    A litre if you are lucky
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  3. #3
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    Jul 2014
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    Thanks for the reply Dave. I'll probably get a little more then.

    Cheers,
    Stu
    AK427 Gen III, Ford 347, TKO600
    Build Blog:- stu238-ak427.blogspot.co.uk

  4. #4
    Join Date
    Nov 2013
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    Quote Originally Posted by Stu238 View Post
    Thanks for the reply Dave. I'll probably get a little more then.

    Cheers,
    Stu
    You will need more as firstly you will need to fill the reservoir up then you will need to keep filling it as you fill the piping and then bleed them out
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  5. #5
    Join Date
    Jul 2012
    Location
    NW England
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    252
    You could make an estimation of system volume by adding up the volumes of the cylinders (presumably you know the diameters, approximate extensions and quantity?) and the reservoir. The pipes won't involve too much volume but should be easy to work out.

    Bear in mind when bleeding the brakes the aim is to get as much air out as possible (all of it) not to blast as much fluid through as you you can. If you do it wrong you could pump a bucket full through and still leave air in, do it right and only a small amount will be needed.
    Worth filling the system and leaving for a bit, air will naturally riee to the highest point and some will try to escape through the reservoir.
    Holding the pedal down 9vernight will not help to bleed the brakes.

  6. #6
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    Thanks for all the replies. Greatly appreciated.

    Looks like I'll do a quick calculation to get a rough volume and then get plenty more just to be safe . Just thinking about it I may give it a bit of a flush out too with a cheaper option fluid.

    As I will be doing this on my own has any one used something like the Gunson Eezibleed to 'make it a little easier'?

    Cheers,
    Stu
    AK427 Gen III, Ford 347, TKO600
    Build Blog:- stu238-ak427.blogspot.co.uk

  7. #7
    Join Date
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    You will need quite a lot more depending on how easy it is to get all the air out of the system, so no point in working out how much you need to just fill it. I found the cheapest way was to get a 5L bottle as this was about the same price as just over 2 x 1L bottles. Then just blead away and if for any reason you need to adjust anything in the braking system which introduces air in it you will still have plenty to rebleed the system. JMHO

  8. #8
    Join Date
    Sep 2009
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    Leeds
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    i bough one of these a few weeks ago to do the brakes on the Mini after i'd replaced all the discs and pad and the front calipers - so much easier and little chance of getting air back in the system. Used a car tyre as the air feed/pressure source.

    https://www.screwfix.com/p/gunson-br...iece-set/33881



    well worth the outlay - and i'm a cheapskate - lol

    Gary
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  9. #9
    Join Date
    Jul 2014
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    Thanks all. Great info as always.

    Looks like a 5 litre container and as Tinka suggested. Always better to too much and a bit spare. Also thanks Gary for the link to Screwfix for the Eezibleed.

    Purchases in hand .

    Cheers,
    Stu
    AK427 Gen III, Ford 347, TKO600
    Build Blog:- stu238-ak427.blogspot.co.uk

  10. #10
    Join Date
    Oct 2006
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    Toton, Nottinghamshire
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    I replaced my front calipers and bled the rest of the brake system earlier this year. Definitely worth get yourself one of the Gunson pressurised bleed kits as Gary suggested. Makes the whole job a lot easier. I managed to get by needing less than a couple of litre bottles of Pagid DOT4. Always worth having extra if needed and you can use the same stuff to fill your clutch hydraulic circuit too.

    Russ.
    Joint Area Rep - East Midlands Region
    1984 DAX Cobra
    Rover 3.5 V8 with Holley carburetor.

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