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'94 940 Turbo - no brake fluid on front wheels 900 1994

posted by  Shawzy on  Sun Dec 21 02:56 CST 2008
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last visit: Mon Dec 22 02:51 CST 2008
[RELATED]

Hi all hoping the brickboard can help me out here with brake problem.

My good bud purchased my '94 940 Turbo from me a while back, and has developed an odd problem with the brakes. The pedal goes to the floor without much resistance, and at the very end of travel the brakes grab slightly. They seem to be reduced to about 15-20% of normal.

After some analysis it seems as though the front wheels are not getting much fluid at all, rears are getting some but also somewhat restricted. This happened overnight, i.e. was not a gradual thing. Before then brakes were just fine. New calipers all around.

A local wrench pointed to the ABS regulator/module (i.e. the hydraulic not the electrical).

First thought was master cylinder, but i hear that rarely goes on these cars. And if it was the master cylinder i would think all wheels would be affected equally

The ABS regulator is mucho $$$$$$ so i would hate to see it replaced and not fix the problem.

Any ideas?







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    '94 940 Turbo - no brake fluid on front wheels 900 1994

    posted by  trichard on  Sun Dec 21 03:52 CST 2008
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    last visit: Fri Oct 24 05:52 CST 2014
    [RELATED]

    if you go here http://www.car-part.com

    you can find a good used modulator for under 50 bucks








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      '94 940 Turbo - no brake fluid on front wheels 900 1994

      posted by  Shawzy on  Sun Dec 21 04:40 CST 2008
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      last visit: Mon Dec 22 02:51 CST 2008
      [RELATED]

      Thanks for the tip on used parts trichard

      After digging out some old Chilton's i forgot about, i have some more knowledge and therefore some specific questions

      Master cylinder
      - there are 2 pistons, one for front and one for rear; has anyone seen a master cylinder fail on one piston only? i.e front bad, rear ok?

      ABS Modulator
      - Both front wheels are controlled by independant solonoids/valves. For both front wheels to loose fluid at the same time suggests both solonoids fail at same time, which is very unlikely as i see it.

      Brake lines:
      Has anyone come across a line that was plugged or otherwise restricted? e.g. bad check valve?

      Any help appreciated







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        '94 940 Turbo - no brake fluid on front wheels 900 1994

        posted by  trichard on  Sun Dec 21 08:21 CST 2008
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        last visit: Fri Oct 24 05:52 CST 2014
        [RELATED]

        you said it has new calipers.
        were they bled right?
        has anyone tried re bleeding them now?








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          '94 940 Turbo - no brake fluid on front wheels 900 1994

          posted by  Shawzy on  Sun Dec 21 10:37 CST 2008
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          last visit: Mon Dec 22 02:51 CST 2008
          [RELATED]

          They have been bled yes - all good. During bleeding it was discovered the front wheels aren't getting enough fluid.







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