Brake Fluid change
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  • 1 Post By TheDuck

Thread: Brake Fluid change

  1. #1

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    Brake Fluid change

    I'm about to change brake fluid, I plan to do it without flushing - push old fluid out with new method

    so the front is not an issue pretty straight forward

    also most of the rear seems reasonably straight forward too -
    maybe someone can provide the order for me

    the bit that puzzles me is the Aux master cylinder on the front left - how do you replace the fluid in that line to the rear calibre - I assume it gets fluid from the rear reservoir, is there a bleed nipple I am missing ? are there more than 6 - do you operate it like manually forcing fluid to the rear ? - maybe a couple of times once new fluid reaches there using the rear lever then back to the rear lever to do the final flush

    so I'm guessing something like this


    updated - this is the correct order


    - Front left and right

    - front (middle) right and left using rear lever

    - rear (outer)
    using rear lever (aux master)

    - rear (
    middle)

    obviously closing nipples between pumps

    is that pretty much it ?
    Last edited by GeoffXX; 07-18-2019 at 2:05 AM.

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  3. #2

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    Re: Brake Fluid change

    Geoff
    Download the service manual in the resources center. It has the full procedure and order it's done in.
    Route 191 formerly Route 666 Some say that this section of the
    road has 1100 curves in 95 miles.

  4. #3

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    Re: Brake Fluid change

    I have it, so it is the same order even though I'm not flushing - I guess it should be

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    Supercharged Mod
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    Re: Brake Fluid change

    Quote Originally Posted by GeoffXX View Post
    I have it, so it is the same order even though I'm not flushing - I guess it should be
    yes, same order and as long as you keep the reservoirs topped up there should be no problems (did the job myself last week)

    One thing, that you mentioned the secondary cylinder. This gathers all sorts of black goo over the years (why people report rear binding problems / blocked gauzes). When I replace the fluid I disconnect the secondary cylinder and give the push rod a few manual pumps. This ensures that the cylinder receives new fluid and any black goo will eventually find it's way out of the rear cylinder. Note this can take a long time to appear (the line is really long) and on a couple of occasions I have seen nice clean fluid appearing from the caliper, thought 'that's got it' only for the mess to suddenly appear in the bleed tube!
    GeoffXX likes this.
    Full of Hot air? Intercool yourself............ you know it makes sense

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    Re: Brake Fluid change

    Quote Originally Posted by TheDuck View Post
    yes, same order and as long as you keep the reservoirs topped up there should be no problems (did the job myself last week)

    One thing, that you mentioned the secondary cylinder. This gathers all sorts of black goo over the years (why people report rear binding problems / blocked gauzes). When I replace the fluid I disconnect the secondary cylinder and give the push rod a few manual pumps. This ensures that the cylinder receives new fluid and any black goo will eventually find it's way out of the rear cylinder. Note this can take a long time to appear (the line is really long) and on a couple of occasions I have seen nice clean fluid appearing from the caliper, thought 'that's got it' only for the mess to suddenly appear in the bleed tube!

    cheers mate for the very good info - you are a star +++++

  8. #6

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    Re: Brake Fluid change

    I flush my fluid once a year to prevent problems down the road. I have used motul 5.1 for many years with great results.

  9. #7

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    Re: Brake Fluid change

    just did mine and it took about 30 min once all the kit was prepared and in place
    when you are doing the middle nipple at the front you will need a helper to push the footpedal on the rhs that is unless you have a 8 ft arm span
    other than that its pretty plain sailing as long as you dont let air get in the pipework which is very very long....

  10. #8

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    Re: Brake Fluid change

    Quote Originally Posted by cbrpaul View Post
    just did mine and it took about 30 min once all the kit was prepared and in place
    when you are doing the middle nipple at the front you will need a helper to push the footpedal on the rhs that is unless you have a 8 ft arm span
    other than that its pretty plain sailing as long as you dont let air get in the pipework which is very very long....
    cheers for that - I have 500ml of dot 4 which is probably not quite enough but I also have some dot 3 which I will use for the rear lines - dot 3 and 4 can be mixed and not so important for the rear caliper as less heat produced - dot 4 is critical for the front as that is were the main braking is performed - no point in wasting what I have lol

    and yes I will have a pedal pusher lol

  11. #9

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    Re: Brake Fluid change

    i had already sucked out the old fluid in the reservoirs with a squeeze bottle and cleaned the reservoirs and refilled with new fluid
    so i use much less fluid then if you keep the old stuff in and add new
    i think i used in total about 200 cc for all 3 lines before the fluid came out as new
    dont forget the lhs fork torque cbs pump that will push out via the rear caliper...


 

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