Draining brake fluid?
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  1. #1
    Nowheresville JackGriffin's Avatar
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    Draining brake fluid?

    I want to drain all the brake fluid from a project, to replace it with fresh fluid.

    To bleed the brakes it says go from the furthest - left rear, right rear, left front, right front - but something is telling me that to drain it fully it would be better in the reverse order? I'm using a Mityvac to draw it through, and it is a dual circuit system (front/rear split) and has an older ('80s) ABS unit.

    Ultimately I guess it doesn't really matter, as eventually it should all come out. What does the team think?

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    Official RnS Addict mygasser's Avatar
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    suck the fluid out of the reservoir and replace with new, then have someone top up as you go and when the fluid comes through clean at each wheel you're done. as you say dont suppose order matters as you're not trying to bleed air out, just renew the fluid.

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    Nowheresville JackGriffin's Avatar
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    Thanks, I wondered about doing that, but the fluid in there looks perfect so I wouldn't be able to tell when the fresh stuff 'arrived'.

    So why am I changing it? Well, the car has been standing for sixteen years, and the dealership used to change the fluid at each major service anyway. I have considered just seeing what happens, but as the brakes are fairly useful, especially with an auto box, I thought 'better safe than sorry'!

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  6. #4
    Official RnS Addict mygasser's Avatar
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    especially as brake fluid is hydroscopic or summat like that (it absorbs moisture from the atmosphere which lowers the boiling point). as you say, better safe than sorry. the whole system probably holds less than a litre so if you suck 0.25 litres from each corner i'd say you're in the ballpark.

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