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Thread: Replace Brake Fluid Or Not???

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    Regular Member Ben H's Avatar
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    Default Replace Brake Fluid Or Not???

    Booked the bus in today for it's 2nd service and just coming up to 27k on the clock.
    Girl on phone gave me "the manufacturer advises you have the brake fluid replaced every two years, would you like this added to your service?"

    Told her I'd give it a miss as I've been told by mechanics their own personal cars have gone 80k without the need of replacing brake fluid.

    The bus is only used for the normal domestic use and there seems nothing wrong what so ever with the brakes (ucking deers again, I let it live this time!!!) and for the size of the car they certainly pulled it up well.

    What do you reckon? Is it just a manufacturer ploy to get you to waste a further £30 every two years or should it be replaced?

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    [Ex]Admin Duncan's Avatar
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    It's not so much the mileage that you've done that matters with brake fluid - it's the time that it's been in there.

    Brake fluid is hygroscopic (absorbs water) so over time it will have it's efficiency reduced - hence the two year thing.

    How much are they asking to change the fluid?

    EDIT: Doh, £30 obviously. It's not an outrageous price. You could go longer if your brakes feel okay - not spongy, excess travel etc. Up to you.

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    Regular Member Ben H's Avatar
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    Cheers Dunc, gotta say I was impressed the other night, Halloween it was actually. We nearly turned up at the inlaws with a themed bonnet, covered in blood with a deer head in the grill.
    Think I may leave it another 12 months maybe.

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    Ex Vec-C Admin & Founder GARY3306's Avatar
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    Basically what happens is the fluid takes on water which in itself is non-compressible so no real drama. The problem comes if the brakes are being used a lot and the fluid starts to get hot, the water content then turns to steam, and steam IS compressible so the brake pedal suddenly hits the floor and there is no braking effort or negligable braking effort. Scary. Garages can use a gadget to test the moisture content of the fluid. I use one at work and it has only twice indicated that fluid required changing.
    [SIGPIC]VX<font color=Red>R</font> with added Courtenay <img src=https://www.vectra-c.com/forum/images/smilies/biggrin.png border=0 alt= title=Big Grin class=inlineimg />

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    Regular Member Ste's Avatar
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    Vehicle : Jaguar XF 3.0D V6

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    I don't advocate changing routinely every set time / distance. Mine's now at 4 years and 98 K on original fluid.

    Any water absorbed has to get the the businees end to do any damage anyway, and how much actually contaminates the brake fluid and how does it get to the hot end?

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    Regular Member Fruit'n'nut's Avatar
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    Quote Originally Posted by Ste View Post
    Any water absorbed has to get the the businees end to do any damage anyway, and how much actually contaminates the brake fluid and how does it get to the hot end?

    Will (eventually) it vapourise under pressure?

    Personally, I've always changed brake fluid on cars or bikes every two years or so, either myself or at the garage, and been able to feel a distinct difference afterwards.

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