E60 Brake Fluid Change - Please advice

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  1. E60 Brake Fluid Change - Please advice 
    #1
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    Hi
    I'm about to change brake fluid.
    Could anyone please advice what is the best brake fluid for E60?
    Many thanks
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    A regular Dot 4 nothing special
     
     

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    What is all this talking about dot 5.1 then? Is it really so special?
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    It is for race cars, check your manual but almost all road car use Dot 4 (the obvious exceptions like M5's Lambo's etc)
     
     

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    MasterE60Blaster (26-03-2012)

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    I see. Thank you
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    +1 with Mathew on that:-
    Some of the super duper race fluids are silicone based which sounds great but is actually a bad idea on a year round road car. Normal brake fluid mixes, quite readily, with water and this gives it the ability to absorb condensation out of the braking system. Silicon fluid does not absorb water at all. This means any condensation can sit in small pockets and cause corrosion, not what you want in your ABS system! The worst problem with water is it can boil so a hot caliper can get pockets of steam that will effectively render the brakes inoperative. Coventional brake fluid does eventually boil once it gets heavily contaminated with water and this is the main reason to replace it.
     
     

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    MasterE60Blaster (26-03-2012)

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    Dot 4. just a few quid. Dot 5 is for racing/track cars as mathew mentioned.
     
     

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    MasterE60Blaster (26-03-2012)

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    Thanks guys.
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    I recently replaced mine with Dot 5,

    It has a better tempreture rating and a little upgrade from Dot 4

    Yes, it's used in high performance cars and track/race cars so if its good for them its good for my car.


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    I'll also add your whole system needs a thorough flush as DOT 5 and DOT 4 are not supposed to be mixed and generally it is not considered suitable for cars with ABS brakes!.........

    DOT 5.1, which I admit I confused with DOT 5 is actually a PAG, not silicon fluid so should be safe. Apparently, in the US it is manditory to label DOT 5 as silicon based and print a warning about its uses on the bottle

    http://www.gomog.com/allmorgan/brakefluids.html#Since

    http://en.wikipedia.org/wiki/DOT_5

    http://en.wikipedia.org/wiki/DOT_5.1
    Last edited by kwempe; 26-03-2012 at 02:21. Reason: links added
     
     

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