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Thread: Confusing brake problem

  1. #1
    Regular Member owen_999's Avatar
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    Vehicle : Vectra SRI 150

    Trim : SRI

    Engine : 1.9cdti 150

    Year : 2007

    Default Confusing brake problem

    As people have probably seen I've been having strange problems with my car.

    Well yet again the brakes have come back to haunt me. Driving along today and I put the brakes on and the pedal felt as if it sort of just dropped away from my foot and the brakes didn't go on. Old handbrake is earning its use.

    Vauxhall have had it back and say there is no fault codes on the car but I'm just wondering if it could be something mechanical like the master cylinder or even an ecu problem tricking the abs. I just don't know what it could be.

  2. #2
    Regular Member STICKY3.2's Avatar
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    Is this an intermittent fault or is it there all the time?

  3. #3
    Regular Member owen_999's Avatar
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    Vehicle : Vectra SRI 150

    Trim : SRI

    Engine : 1.9cdti 150

    Year : 2007

    Default

    It's happened twice to me now and its just completely random. The first time was under heavy breaking and this time I was just lightly touching to pull up for a junction. It seems completely random to me. There seems to be no specific circumstances I can think of that causes it.

  4. #4
    Regular Member STICKY3.2's Avatar
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    I would guess that the master cylinder is failing. A bit worrying for you as you don't know what brakes you are going to get when you press the pedal. One test for master cylinder is put your foot on the brake and keep constant pressure if it creeps all the way to the floor the master cylinder is probably faulty

  5. #5
    Regular Member owen_999's Avatar
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    Vehicle : Vectra SRI 150

    Trim : SRI

    Engine : 1.9cdti 150

    Year : 2007

    Default

    Yep that happens. But is that not due to the double diaphragm or do you mean when the engine is off?

  6. #6
    Regular Member Ben50n's Avatar
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    With the engine switched off, the pedal should go hard after a couple of pumps. Then try pressing hard on it to see if the pedal sinks to the ground. If it sinks then there is a leak and I would say its the master cylinder.

  7. #7
    Regular Member owen_999's Avatar
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    Vehicle : Vectra SRI 150

    Trim : SRI

    Engine : 1.9cdti 150

    Year : 2007

    Default

    Well there is no visual signs of a leak. Have just pumped the pedal to make it hard and with constant pressure it creeps to about half way the stops. If I apply a bit more pressure it is pretty solid. I'm completely stumped on this :-/ is anybody around the Southampton area that has a bit more knowledge an experience about tomorrow to help me? Just don't want to be driving such a dodgy car.

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    hi it sounds like your master cylinder is letting fluid passed the seals inside which will show no signs of a leak and only give you half your brakes either front or rear.

  9. #9
    Regular Member owen_999's Avatar
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    Vehicle : Vectra SRI 150

    Trim : SRI

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    Year : 2007

    Default

    That's what I think but my vaux garage just say to me well the computer says its fine so there is nothing wrong with it. Might just give the car back and say not fit for purpose or safe on te road.

  10. #10
    Regular Member Ben50n's Avatar
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    I do not know how it would show up on the computer? Its a hydraulic seal problem not an ABS problem.


    Take it back or get them to sign a statement that if you have an accident due to brake failuer, then they will be totally responsible.

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