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How much brake fluid for complete flush? 200

posted by  Adirondack Blues on  Mon Jan 29 06:39 CST 2007
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last visit: Mon Sep 8 12:11 CST 2014
[RELATED]

Last night, on my '92 wagon with ABS, I did a front brake job and bled the brakes with my new Motive bleeder. The Motive unit worked great. I only used about a quart of new fluid (about 250cc from each caliper). I noticed this morning that Bentley recommends removing 500cc from each caliper.

I used Castrol GTX LMA, which I had on hand. When I was done, my fluid was running clear with no bubbles. At any rate, I'm wondering if I did a complete flush. How much fluid does the system really hold? How much fluid do you use to do a complete flush?

Next time I'll probably go with the ATE super blue to eliminate any doubt.

Thanks!
--
'92 240 wagon, 268k, '88 240 sedan 280k








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    posted by  someone claiming to be on  Wed Dec 31 18:00 CST 1969 [RELATED]

    I've got two '93s (with ABS, of course) as well as an '84; and I use the same bleeder and fluid as you.

    I always have a trouble light behind the clear plastic hose I use (i.e., the hose is between the bulb and my eyes) to drain the bleeder, so I can easily see the color and opacity of the fluid coming out of the caliper. It's always easy to see when the new fluid is coming out! And I've always found that I use (see next paragraph) more fluid than necessary -- but what the heck, it's worth it to be sure!

    As a rule, I fill it with two quarts (~2,000 ml), and I just let them flow so that about 1/5 of the bottle's contents has flowed for each caliper (for the '93's ABS system), because these have only one bleeder for each front caliper; that will leave me 1/5 leftover after ~400 ml has flowed out of each bleeder. For the '84, because it has six bleeders, I use less fluid for each -- I estimate about 1/8 of the bottle, or 250 ml., as allocation for each bleeder!


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    posted by  someone claiming to be on  Wed Dec 31 18:00 CST 1969 [RELATED]

    I think that I'm bound to get air in the system because I'll be replacing all the brake hoses. So what do I do then, turkey baster out the old and just fill up the MC with new fluid and pressurize the remainder with the pump system at about 15 psi?

    Thanks.
    --
    '86 sedan with 355K miles with original engine and automatic transmission



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    posted by  someone claiming to be on  Wed Dec 31 18:00 CST 1969 [RELATED]

    I routinely get a full flush with less than a liter.

    That's using ATe Super Blue, stopping when the color changes at the bleeder.

    This is based on a lot of preABS 240's, one ABS 240, and one ABS 940.

    Bleeding pressure is with MityVac (pressure port).
    --
    Bruce Young
    '93 940-NA (current), 240s (one V8), 140s, 122s, since '63.



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    posted by  someone claiming to be on  Wed Dec 31 18:00 CST 1969 [RELATED]

    did you turkey baste the old fluid from the resevoir and fill with fresh before the actual bleeding process?

    nevertheless, i think you'll be fine.

    so you know, when i do a complete flush it's about 2 liters.


    --
    (http://drevilspinazzz.ytmnd.com) "Be who you are and say what you feel because those who matter don't mind and those who mind don't matter" - Dr. Seuss



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      posted by  someone claiming to be on  Wed Dec 31 18:00 CST 1969 [RELATED]

      "did you turkey baste the old fluid from the resevoir and fill with fresh before the actual bleeding process?"

      I could never get a baster in the rear half of the reservoir. So I drain it from the LF caliper bleeders. The top bleeder drains the front "compartment" (or is it the rear?), and either/both lower bleeders will drain the other.

      That LF location makes it easy to keep an eye on the level while draining.
      Pressurizing the MC makes it quicker than gravity draining.
      --
      Bruce Young
      '93 940-NA (current), 240s (one V8), 140s, 122s, since '63.



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      posted by  someone claiming to be on  Wed Dec 31 18:00 CST 1969 [RELATED]

      Thanks.

      The motive unit is so much fun to use, I'll probably do it again with the ATE Super blue!
      --
      '92 240 wagon, 268k, '88 240 sedan 280k



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      posted by  someone claiming to be on  Wed Dec 31 18:00 CST 1969 [RELATED]

      If you're only doing the front (or rear) brakes, should you bleed all four calipers?



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        posted by  someone claiming to be on  Wed Dec 31 18:00 CST 1969 [RELATED]

        What are you doing?

        If its just pads, no bleeding should be needed.

        Regards,

        Bob

        :>)



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          posted by  someone claiming to be on  Wed Dec 31 18:00 CST 1969 [RELATED]

          Pads & Rotors.

          So if I'm doing rotors and pads on the front, should I bleed all four calipers?



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            posted by  someone claiming to be on  Wed Dec 31 18:00 CST 1969 [RELATED]

            no, you should not have to bleed anything if you just replace pads & rotors.

            what you'll have to do, because pushing the caliper pistons back to fit the new pads will force fluid into the master cylinder, is turkey baste some fluid from the master cylinder.

            it'll be over-filled & run out if you dont.

            i think there is another post, in this thread, regarding opening the bleeder when doing this service.


            --
            (http://drevilspinazzz.ytmnd.com) "Be who you are and say what you feel because those who matter don't mind and those who mind don't matter" - Dr. Seuss



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