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Thread: Diesel Creep?

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    Default Diesel Creep?

    Hi Folks hope you can help,

    I have a Signum 2.2dti, and am unsure if this is normal or not. Ive read on the internet this being called diesel creep.
    With the engine running, if I press the brake pedal it gets hard as expected but if I continue to apply pressure the pedal creeps to the floor. With the engine switched off I can apply the brakes and it will go hard and move nowhere, pumpimg with the engine off they go solid.
    Dont get me wrong the brakes work fine but just wanted confirmation this is normal? When my car was at the dealers one time and was on a test run with technician, for a different problem, he told me it was diesel creep the signum diesel having a pump and not a servo. True or false?

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    Admin plasma's Avatar
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    Vehicle : Vectra

    Trim : SRi

    Engine : 150

    Year : 05

    Mileage : 74000

    Default

    I get the same on mine, but others will be along to confirm it i reckon.

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    Regular Member Harry's Avatar
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    LOL!! Dean i think you have a different type of diesel creep, one where your brakes refuse to work full stop.

    or at least you used to!

    i've never experienced or never noticed, and i normally sit at traffic lights with my foot on the brake, although admittedly, i'm not applying much pressure

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    Regular Member Green Growler's Avatar
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    Default

    I've not noticed either (mines a 2.2) and also being an auto my foot is always on the brake when stationary.

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    Default

    I must admit it wasnt something I had notised, until sum1 else took my car 4 a run and pointed it out to me, I find I dont need to apply heavy pressure at all to stop the car. But apply a little additional pressure when stationary and that pedal creeps, if you hav a diesel try it - you may be surprised!
    Last edited by GaryJ; 16th January 2007 at 21:47.

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    Regular Member Harry's Avatar
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    Default

    how much pressure are we talking about?

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    Regular Member rushy's Avatar
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    Vehicle : SRi


    Engine : Z22SE (2.2 Petrol)

    Year : 2004

    Mileage : 137000

    Default

    My 2.2 petrol pedal will be hard at stop, then after about 30 seconds the pedal will drop about 1 third then hold in that position till I take my foot off.

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    Ive been told that diesels are different to petrols, a pump as a pose to a vacuum servo, is this true? and is this difference the cause of diesel creep? here is something I found on the web http://www.brakesint.co.uk/pdf/techn...stance_202.pdf
    Last edited by GaryJ; 16th January 2007 at 21:48.

  9. #9
    Regular Member Gsi3.2's Avatar
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    yes, it is true.. petrol cars get a vacumn from the inlet manifold.. While diesels use an engine driven pump system as their inlet's don't run under vacumn but under pressure ( turbo)..

    If the brakes go soild when there is no servo assistance then it points to the servo.. if it was the pump you would have no assistance whatsoever and the pedal would be rock hard on every push.. but it would also require a lot more effort from you to stop the car..check for air leaks around the servo assembly ( suction leaks, not pressure leaks).. it may even need a new servo.

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    Ex Vec-C Admin & Founder GARY3306's Avatar
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    If you pump the pedal with the engine off it will go hard after three or four pumps as you exhaust the servo. If you then keep the pedal pressed and start the car, the pedal should sink markedly as the vacuum pump works to provide servo assistance. As mark says, if the servo or vacuum pump doesn't work, you'll know it
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