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85 vs 92 240 Master brake Cylinder 200

posted by  dobber13 on  Wed Aug 12 05:20 CST 2009
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last visit: Sat Oct 18 19:10 CST 2014
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Hi All, Is there any difference between the 2 master cylinder's other then the reservoir? Can I use the 85 reservoir on the 92 M.C.? I know it fits because I tried it. Thanks,Charlie








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    85 vs 92 240 Master brake Cylinder 200

    posted by  jthorner on  Thu Aug 13 12:54 CST 2009
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    last visit: Mon Jan 4 04:02 CST 2010
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    The ABS equipped cars use a different master cylinder than the non-ABS 240s. I would absolutely not mess around with using the wrong one.

    '92 = ABS, '85 = no-ABS







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    85 vs 92 240 Master brake Cylinder 200

    posted by  TONY H on  Wed Aug 12 12:29 CST 2009
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    last visit: Fri Oct 17 16:39 CST 2014
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    Good question. I believe that the front Calipers were changed over those years but I suspect if the size of the Caliper Piston is the same then the proportion of braking should be the same. Is the Plunger length the same on both Masters?
    --
    '75 Jeep CJ5 345Hp ChevyPwrd, two motorcycles, '85 Pickup: The '89 Volvo is the newest vehicle I own. it wasn't Volvos safety , it was Longevity that sold me http://home.no.net/ebrox/Tony's%20cars.htm








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      85 vs 92 240 Master brake Cylinder 200

      posted by  dobber13 on  Wed Aug 12 13:45 CST 2009
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      last visit: Sat Oct 18 19:10 CST 2014
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      Thanks for the reply,I still have the one on my car so I would have to pull it apart to measure the plunger length. I didn't want to pull it because It's my daily driver.My problem is my brakes stop O.K. but I don't stop very good if I stomp on the brakes if I have to but the pedal seems hard at that point.I replaced the Brake Booster,bled the brakes and still have that problem.The brake booster holds vacuum after shut down because the next morning I pulled the hose to the booster and still had vacuum. I thought maybe the master is leaking internally.Could the Pressure Differential Warning Valve have anything to do with the problem because I have never got any Warning Light so I thought it to be O.K.,also cleaned the 2 pressure regulating valves on the axle but no change.So with all that I'm looking at the M.C.because i'm running out of idea's.








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      85 vs 92 240 Master brake Cylinder 200

      uid 27's pic
      posted by  Art Benstein on  Wed Aug 12 13:13 CST 2009
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      last visit: Fri Oct 17 20:10 CST 2014
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      A 92 has ABS.
      --
      Art Benstein near Baltimore

      "If life were fair, Elvis would be alive and all the impersonators would be dead." (Johnny Carson)








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        85 vs 92 240 Master brake Cylinder 200

        posted by  dobber13 on  Wed Aug 12 14:15 CST 2009
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        last visit: Sat Oct 18 19:10 CST 2014
        [RELATED]

        Hi Art, Are you saying that it won't work? Charlie








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          85 vs 92 240 Master brake Cylinder 200

          uid 27's pic
          posted by  Art Benstein on  Thu Aug 13 06:29 CST 2009
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          last visit: Fri Oct 17 20:10 CST 2014
          [RELATED]

          Hi Charlie,

          Sorry, I was reading Tony's discussion about master cylinder sizing, and I see your original question was about the reservoir.

          Sure the rez fits. And you'll lose the safety warning light if you put the square box on instead of the triangular one. I don't know about internal baffling - the little wall between primary and secondary. I imagine it will "work," but I would not go so far as to advise using it -- naturally -- this is your braking system we're talking about.

          While trying to figure out why they get more bucks for the ABS master, and wondering if the hydraulics were the same inside, I ran into this interesting tutorial:

          www.autoshop101.com/forms/brake02.pdf

          Best of luck, but I would advise scouting the yards for the real thing with the switch in it.
          --
          Art Benstein near Baltimore

          Marriage is a wonderful institution, once you are ready to be institutionalized. - R. Cooke







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            85 vs 92 240 Master brake Cylinder 200

            posted by  dobber13 on  Thu Aug 13 14:12 CST 2009
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            last visit: Sat Oct 18 19:10 CST 2014
            [RELATED]

            Thanks Art,The tutorial for ABS/NON ABS M.C.was interesting but even after reading about the two I still think that the ABS would work on the NON ABS because even if the internals are different they are still doing the same job but I don't have the balls to try it.I wonder if someone else has.I'm buying a new M.C.right now.Thanks everyone for there input.Charlie







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