Brake fluid intervals

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Thread: Brake fluid intervals

  1. #1
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    Brake fluid intervals

    I'm tempted to have my brake fluid changed as my garage is going to be removing the trim over the reservoir to replace a wind seal. The car is less than 3 years old and I have no softness in the pedal but it seems like a good opportunity. Audi say the fluid doesn't need changing for 3 years from new but subsequently every 2 years. Does anyone know why the variation in schedule?


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    Last edited by baradona; 04-29-2012 at 11:21 AM.

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  3. #2
    Super Moderator KfabR8's Avatar
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    Re: Brake fluid intervals

    Changing it out is never a bad idea. Even as well sealed as modern automotive brake systems are, humidity (water) can work it's way into the system which is what degrades the brake fluid.

    Brake fluid (other than DOT5 - the silicone stuff) is glycol-based and hygroscopic, which means that it absorbs water. Adding water lowers the boiling point of the fluid, which can lead to fad and loss of braking power as the system gets hot - not a good thing at all!

    Get your garage to put Motul RBF 600 in it and you'll have a happy brake system.

    Bleeding the system is readily accomplished by using a pressure bleed system - you feed the res from a pressurized bottle that forces all the old fluid out of the system. A pressurized bleeding also helps get the ABS module's fluid flushed.

    Start at the wheel closest to the master cylinder first (would be the front right on a right hand drive vehicle), doing the inner bleeder first then the outer bleeder. Next would be the the left front, then right rear and finally left rear (always doing the inner then outer bleeders).

    The fluid will change color as the new stuff comes in - can be quite subtle but a good eye will notice the change as the old stuff gets pushed out and the new stuff arrives.
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  4. #3
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    Thanks kfab. I'm using Audi so will have to talk them into using something non-standard - try don't even want to put V10 air deflectors on for the brakes "in case a stone is deflected into the brake" and I crash! Is the service period on Motul the same as Audi's generic fluid?

    I was wondering whether the reason for the longer first interval is guaranteed fresh / uncorrupted fluid from the factory vs the open can at the dealer's (!).


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  5. #4
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    Re: Brake fluid intervals

    Resurrecting an old thread.

    My car is up for brake fluid change. What is the quantity I need to buy?

    Also, I noticed that sellers of Motul RBF 600 it's not to be used on street cars, only racing cars, why? makes no sense to me. In any case our R8s are not exactly normal street cars.

    Thanks
    Last edited by M3R8; 11-06-2012 at 02:42 AM.

  6. #5

    Re: Brake fluid intervals

    I just did a brake fluid "heavy bleed", but not necessarily a full flush. I used just under two pints of RBF 600. I'm guessing a full exchange might take twice that? -- Okay, I just looked it up and the official stated capacity of the brake system on a 2010 R8 is 1.0L (1.1 qt) of DOT4 fluid.
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  7. #6
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    Re: Brake fluid intervals

    Thanks desperado. How about the RBF600, is it also recommended for a car that's not being tracked at all?

  8. #7

    Re: Brake fluid intervals

    The RBF 600 will be fine. I don't think there is anything about "good" brake fluid which would make it less suited for a daily driver than an "okay" brake fluid. They all "meet or exceed" the DOT 4 requirements.

    You can spend from USD$7/qt(lt) to $80/pint(500ml) for brake fluid. In return you get increasing wet boiling point. This can be important with the very high brake temperatures reached on the track.

    For a car which is never tracked, you would be fine with a standard or medium grade of fluid. A good value compromise between the two ends of the spectrum is the ATE brake fluid, available in two colors with the same/similar properties: Type 200 (amber) and Super Blue Racing. Alternating between the two colors at each flush gives a clear indicator of when the new fluid has reached the caliper.
    Last edited by desperado; 11-10-2012 at 07:03 PM.
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