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Brake pedal does not return 120-130

posted by  BACHELOR54 on  Sat Aug 24 08:38 CST 2019
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last visit: Fri Oct 24 07:10 CST 2014
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I have a 68 122S. I modified it years ago to a 140 power brake set up. It has worked well for years. This week I found the brake pedal would remain engaged. I suspected the booster. I replaced the booster with a new one. Same result. With the engine off I can pump the brakes and the pedal returns. Once the engine is running, the brakes remain on. I did notice the fluid reservoir was half way down so I topped it off. Still no dice ! Any thoughts ?








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    Brake pedal does not return 120-130

    posted by  jwalker on  Sun Aug 25 04:52 CST 2019
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    last visit: Fri Jun 6 08:39 CST 2014
    [RELATED]

    Bad master cylinder?? I seem to remember this happening on one of BMW 2002’s many years ago but can’t remember the cause.
    --
    Will I buy another Volvo??? We'll see....








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      Brake pedal does not return 120-130

      posted by  BACHELOR54 on  Sun Aug 25 05:44 CST 2019
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      last visit: Fri Oct 24 07:10 CST 2014
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      Thank you. I have a spare.








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        Brake pedal does not return 120-130

        posted by  derek uk on  Sun Aug 25 05:56 CST 2019
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        last visit: Fri Oct 24 12:33 CST 2014
        [RELATED]

        Can a stuck non-return valve give this problem? The one in the hose from manifold to servo. Fitted the wrong way round?








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          Brake pedal does not return 120-130

          posted by  BACHELOR54 on  Sun Aug 25 13:58 CST 2019
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          last visit: Fri Oct 24 07:10 CST 2014
          [RELATED]

          It worked fine for years. Nothing changed until this week when the brake pedal would not return and brakes remain engaged. If I disconnect the vacuum by either pinching it off or shut the car ,the pedal returns normally. But the brakes are not effective this way to stop the car safely.







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