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Thread: Can you diagnose this brake problem?

  1. #1
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    Default Can you diagnose this brake problem?

    Vectra 2004 v6 Diesel estate.
    It failed the MOT on a rear o/s brake leaking.
    Brake was replaced. Picked car up and I notice the brake peddle with engine running has more travel than it did.

    Not bled properly I thought.
    Turned the engine off. then the brake peddle goes hard when pushed as expected as no servo action.
    Start the engine again and the brake peddle slowly sinks to the floor (almost). Is this leaking master cylinder seals, assuming there are no other leaks of course? Just air, as the servo will be adding a considerable compression?
    Last edited by NPS; 13th April 2011 at 17:13.

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    Quote Originally Posted by NPS View Post
    Start the engine again and the brake peddle slowly sinks to the floor (almost).
    I noticed this on my DTi when I first got it (my first diesel car) and was assured that this is normal for diesels. It's due to the difference in the vacuum system compared to petrol engines, I believe. The pedal should go hard when the engine is off (like a petrol) but will slowly sink to the floor under continuous pressure when the engine is running (unlike a petrol).

    I'm not saying you don't have a brake problem but what the brake pedal is doing is probably normal. Can you remember what it did before you had this problem? It sounds like it may need more bleeding and/or brake fluid top-up though if the pedal moves further that it did previously before the brakes start to work.
    Last edited by James24; 13th April 2011 at 17:38.

  3. #3
    Regular Member rushy's Avatar
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    Default

    Sounds like diesel creep and its perfectly normal, as long as it firms up with the engine off.

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    The fact that it feel softer than before then is probably due to air in the system. The pedal creep is normal. Thanks

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    It even has a name

    Perhaps back to the garage for a re-bleed and brake fluid top-up?

  6. #6
    [Ex]Admin Duncan's Avatar
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    Quote Originally Posted by James24 View Post
    The pedal should go hard when the engine is off (like a petrol) but will slowly sink to the floor under continuous pressure when the engine is running (unlike a petrol).
    Quote Originally Posted by rushy View Post
    Sounds like diesel creep and its perfectly normal, as long as it firms up with the engine off.
    Not just diesels. Pedal will gradually creep on petrol cars when engine is on.

    Quote Originally Posted by James24 View Post
    Perhaps back to the garage for a re-bleed and brake fluid top-up?
    No harm. Simply say to them that the brakes feel softer since they worked on them and can they check/rebleed them.

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    Should I expect to pay for the extra work?

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    Full Member plasma's Avatar
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    Not if you say the pedal feels softer, I'd except them to rebleed it again
    Plasma's Tech2 services are now open and able to provide services

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    [Ex]Admin Duncan's Avatar
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    Quote Originally Posted by Duncan View Post
    Not just diesels. Pedal will gradually creep on petrol cars when engine is on.
    Thinking about it, isn't this what is know as a 'progressive brake pedal'? I think I remember that being the term used when I queried mine, but that was a long time ago. I didn't know it was the same now on petrols as on diesels.

    As above, the re-bleed and top-up should be free.

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