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Quick help with new Master Cylinder?? Bleeding question

posted by  mbsl98 on  Sat Feb 2 09:03 CST 2008
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last visit: Sat Feb 2 12:35 CST 2008
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Hi Guys,
Now that I am in the middle of swapping out my master cylinder and ready to start the install, I realize I don't know how to do the initial bleeding of the MC. Past advice was to be sure to "bench bleed" the MC before install, or otherwise I'd never get all the air out later. Now that I have the pieces in hand and have been playing with how they operate, I don't see just how to do the first bleed. Is it just a matter of filling the reservoir and then inserting a rod into the end and cycling the piston a few times with it completely off the car? I don't initially see just how that would get rid of air that would not otherwise just be pumped down through the brake lines to the wheel bleeders, although it would seem to make the bleeding faster to do the first pass without lines attached. If it is just cycling before attaching the brake lines, wouldn't it be just as effective, and easier, to install MC on firewall first, so the cycling was done with brake pedal?

Fast replies very appreciated.
Mike
--
Mike Sullivan '07 XC70 (8k), '95 855T (108k), '95 855 NA (160k). Past Volvo's: '85 744 (256k), '86 245 (165k), '86 245 (195k), '88 745 (208k), '91 745 (196k), '93 965 (147k) , '98 V70XC (98k).








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    Quick help with new Master Cylinder?? Bleeding question

    posted by  kshaw on  Sun Feb 3 04:29 CST 2008
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    last visit: Wed Oct 29 13:11 CST 2008
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    When I did mine, I followed the directions that came with the master cylinder. I then fastened the master cylinder to the car but did not connect the brake lines. I then slowly filled the master cylinder until brake fluid would drip from the brake line connections. I then tigtened the brake lines and then topped to recommended height. I then used my mightyvac at each of the wheels to flush the old fluid. Worked fine for me.
    --
    1998 Volvo S70








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    Quick help with new Master Cylinder?? Bleeding question

    posted by  mbsl98 on  Sat Feb 2 12:36 CST 2008
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    last visit: Sat Feb 2 12:35 CST 2008
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    I'm all set - no replies needed. I figures it out, I hope.
    --
    Mike Sullivan '07 XC70 (8k), '95 855T (108k), '95 855 NA (160k). Past Volvo's: '85 744 (256k), '86 245 (165k), '86 245 (195k), '88 745 (208k), '91 745 (196k), '93 965 (147k) , '98 V70XC (98k).







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