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Thread: brake fluids? which one?

  1. #1
    Regular Member Craig1985's Avatar
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    Default brake fluids? which one?

    Hi all, i'm fth on the list for the saab brake upgrade and was wondering which brake fluid to use?

    my brakes dont feel that firm on my 1.9cdti? the car is 1 year old and already covered 32,000 miles? does it need changing?

    is there any benerfits to using for example AP racing fluids?

    any recommendations?

    been told cdti brakes are softer than petrol anyway? somthing to do with diesel creep? not creating its own vacum or summat?

  2. #2
    On a Sabbatical VauxVeteran's Avatar
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    Personally I'd pay the 24 quid and let the dealer do it, you get the right spec fluid and keep your hands clean, and the book stamped to say it's been changed.

  3. #3
    Regular Member aerodynamic18's Avatar
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    do u think they would replace the fluid with dot 5.1 at the dealer as thats ment to be a lot better

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    Regular Member parapaul's Avatar
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    Dealers? DOT 5.1? You'll get Vx standard DOT 4 which is probably no better than any other you can buy, just more expensive!

    I'd buy a bottle of DOT 5.1 and ask whoever's doing the brakes if they'll change it while everything's off.

    HTH

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

    Trim : Black

    Engine : 3.0D V6

    Year : 0000

    Default

    As PP, if you're paying someone to change the brakes calipers, then change the fluid at the same time - if you think you must change it of course.

    1 year and 32K is nothing IMO, mines 4 years and 82K still on factory fluid. I have no immediate plans to change it either. I don't think it is necessary to change brake fluid - but hey, what do I know.



    Diesels have a vacuum pump to create the servo assistance vacuum as they have no manifold pressure depression like a petrol has.

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    Regular Member DeanF's Avatar
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    I have a friend who is addicted to Brake Fluid !!!

    Although he says he can Stop Any Time

    Dean

  7. #7
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    Quote Originally Posted by DeanF View Post
    I have a friend who is addicted to Brake Fluid !!!

    Although he says he can Stop Any Time

    Dean




    time to get yer coat me thinks

  8. #8
    Regular Member Steel's Avatar
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    Vehicle : Vectra

    Trim : SRI CDTI NAV

    Engine : Z19DTH

    Year : 2005

    Mileage : 202,800

    Default

    The reason for recommending brake fluid replacement is due to the fact that it is hygroscopic which means it absorbs water. Although the system is (kind of) sealed water ingress can occur, either through the lid on the master cylinder or through the process of osmosis where it can enter the system through the rubber brake hoses.

    I have to agree with Ste to a point, my personal feeling is that the brake fluid doesn't degrade anywhere near the recommended change periods but I suppose they have to set the bar somewhere and build in a safety margin.

    The only accurate way to measure the effectiveness of brake fluid is to do a boil test with a brake fluid safety meter which boils a sample of the fluid and displays its ACTUAL boiling point which can then be compared to the specification of the fluid. The fact that any top ups go in the master cylinder also means that the best test sample is taken from the calipers as this would be where the fluid affected by osmosis would be.

  9. #9
    Regular Member DeanF's Avatar
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    Quote Originally Posted by Baldy View Post



    time to get yer coat me thinks
    I'll close the door on my way out

    Dean

  10. #10
    Regular Member muffking's Avatar
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    I use AP Racing Dot 5.1. I simply used a fluid pump that runs off a tyre valve.
    I would definately use the fluid again as I didn't boil on a track day and that's with a heavy V6.

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