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Thread: Full brake upgrade - any point in Dot5.1 fluid?

  
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    nry's Avatar
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    Full brake upgrade - any point in Dot5.1 fluid?

    I'll be having rear discs and 280mm discs up front shortly, is there any point using anything other than the standard Dot4 fluid?

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    well i run castrol super response dot 4 fluid. no probs wiht cooking teh fluid as i did with standard stuff. a mate who races uses it in his race car and his tuned road car wiht no probs. dot 5.1 will give you a harder pedal.
    Castle Combe Saloon Car Championship. Car 21, pug 106 GTI. Gone from track days to full on racing

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    Never had an issue with the brakes so will stick with Dot4, will give the Castrol one a look-see.

    How much will I need to bleed and replace the whole braking system?

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    1L should be fine.

    iirc oilman stocks it.
    Castle Combe Saloon Car Championship. Car 21, pug 106 GTI. Gone from track days to full on racing

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    The difference between the two is the minimum dry and wet boiling temps, and that what you need to check up on. It's quite possible for a quality DOT4 fluid to be of a higher spec (boiling points) than a low quality Dot5.1.

    It's nothing to do with 'pedal feel' as all hydraulic fluid by definition is incompressible,

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    Chris, I wouldnt fall for the shpiel either

    mine is running DOT4 and its top notch

    I bought a gallon of the stuff on special at halfords once so just took my time bleeding it all through - still works out cheaper than the 5.1 stuff which i dont see as bein beneficial with my driving

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    Will be sticking with Dot4, cheers all

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    Dot4 chris mate

    Since doing my 308's there is about 7mm of pedal travel before it starts braking, proper responsive
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    i would bleed out about 1-1.5L through out the system
    888
    No. 32

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    y so much? the system is less than 1L
    Castle Combe Saloon Car Championship. Car 21, pug 106 GTI. Gone from track days to full on racing

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