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740 Brake Bleeding Problem

posted by  morevert on  Sun Nov 26 04:49 CST 2006
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last visit: Tue Apr 10 06:51 CST 2012
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I've tryed to read every post I can find & follow past advice. My 1988 has ABS, Bendix front dual pistons & dual nipples, ATE rear. Capped both MC circuits & get rock hard peddle. I uncap frt circuit & get soft paddle, still after rebleeding by manual method & Motive Pressure Bleeder( 20 psi). I believe frt circuit controls RF & LR calipers. I don't get a strong flow using pressure bleeder from any caliper. Should I be running at higher pressure? Also since a capped MC produces hard peddle, would there be any reason to bench bleed MC?








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    740 Brake Bleeding Problem 700 1988

    uid 18083's pic
    posted by  lucid on  Mon Nov 27 08:33 CST 2006
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    last visit: Fri Oct 24 12:31 CST 2014
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    • MC Front goes to Front upper cylinders, Rear left caliper.
    • MC Rear goes to Front lower cylinders, Rear right caliper.

    You can go up with pressure if you want to. Greenbook says 29—44 psi for pressure bleeding (professional bleeder assumed).

    700/900 Greenbook bleed sequence for '88 up: "Bleed one rear wheel, second rear wheel and front wheels in that order". Also implies that Front (2-piston) bleeding should be lower, then upper, on a given caliper.

    IMO, the MC would have to have a LOT of air in order to show anything but a hard pedal when capped. I don't think that test tells you much, unless you have totally shot piston seals.

    --
    Bruce Young
    '93 940-NA (current), 240s (one V8), 140s, 122s, since '63.








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    740 Brake Bleeding Problem

    posted by  Chris Mullet on  Mon Nov 27 04:58 CST 2006
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    last visit: Fri Oct 24 09:08 CST 2014
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    Are any of the rubber brake lines "ballooning" under pressure?

    Also, I don't know it's even possible in your case, but on some cars you can get the left and right side calipers mixed up and they will mount up fine, but the bleeders won't be at the highest point of the cylinders which makes it impossible to bleed all the air out.
    --
    Chris - 1990 740, 1973 1800ES (Non-running), 1993 Dodge Dakota (Still has a little paint left on it)








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      740 Brake Bleeding Problem

      posted by  morevert on  Mon Nov 27 07:25 CST 2006
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      last visit: Tue Apr 10 06:51 CST 2012
      [RELATED]

      No ballooning of hoses. Very stiff hoses. I don't know how some of the past threads we're able to clamp off a line like mine, for trying to isolate a week caliper. The hoses are too short to mix calipers on this car. The frt calipers are installed with the hose inlet on the upper side. I've got a Pressure Bleeder now & using it at ~ 17 psi. No visible leaks







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