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Thread: Brake pedal creep Signum 2.0T (not diesel)

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    Talking Brake pedal creep Signum 2.0T (not diesel)

    The brake pedal creeps down to the floor in 3-5 seconds when the engine is switched on. When the engine is off, it is rock hard.

    I replaced the front brake pads. Unfortunately I was in a hurry, so I forgot to clamp the hoses & open the nipple, so the brake fluid went back into the system. Afterwards I bled all four wheels - used about 1 liter of brake fluid.

    I have taken the car for a short spin, about 2 kms, pumping the brakes with the left foot to break in the new pads. Still the same problem.

    Since the pedal is rock hard when the engine is switched off, I conclude that the master cylinder is probably OK.

    There is no leakage of brake fluid anywhere, but could the hoses need to be replaced?

    Does anyone have a suggestion before I take the car to a garage?

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    Regular Member Ste's Avatar
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    If the vaccuum is produced by a vaccuum pump, as it is on diesels, then it is relatively normal for the brake pedal to creep downwards. As long as the brake pedal is holding firm with the engine off, then all should be OK.

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    [Ex]Admin Duncan's Avatar
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    Perfectly normal when engine running for the pedal to creep. Not good if engine not running so all sounds good in your case.

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    Thank you for your replies, but something must surely be wrong? It was not like this before, the pedal didn't creep to the floor. When it reaches the floor, there is no braking power left! If I pump the pedal, it works. To me this indicates that there is air somewhere, but as far as I understand, I removed it when I bled the brakes....?

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    It would have been like that before - maybe you just hadn't noticed?

    Honestly, for the pedal to creep to the floor when you keep pushing on the pedal (with engine running) is normal. If you pump it it then stiffens up and then will start to drop again if you push on the pedal.

    With engine not running if you pump it it should stay solid - which you say yours does so that's fine.

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    Regular Member RhayaderSax's Avatar
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    When was the fluid COMPLETELY replaced in the brake system? Brake fluid does go "tired" over time which may account for your problem. Try completely draining & replacing the fluid.

    (I had a similar problem on my Vec-B & that cured it)

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    Hi guys, heres reopening this old thread. I set off on a journey yesterday. 30 miles in and I notice the OSF brakes making a "ticking/clicking" noise when braking. Sort of the creaking you get when something tightens. The same on brake release. So, the radio was turned off so my usual paranoid self could listen. Within a mile the brake pedal started to creep down to the floor with even more noise coming from the OSF. As it creeps the caliper (area) is making this creaking noise - as if pressure is going on and coming off at the same time if you see what i mean! I pulled over, had as best a look with the wheels off as I could, got the RAC out, he took it to bits, put it back together, still same, tested it and said "that seems fine, all vectra C diesels have pedal creep". I said "well it wasnt doing that a mile ago" So, after some arguing from my part I got him to drag me home.

    This morning I changed the disks and pads. The pads were getting low but by no means were they on their arse and the disks werent too bad - I already had some disks ready to go on (these had done 80oddK) so its only cost some new pads this morning.

    However, now there is no noise whatsoever from the caliper area but I still have the pedal fade. It used to fade but only very very slightly. Over the last few months of the 4 years I have had the car I have noticed it drop, maybe half an inch or so, whilst sat at lights with foot resting (not stomping) on the brake but it has gone worse on this one trip dramatically, not steadily.

    As with the first post here, engine off - solid as a rock. Engine on and pedal creep. Now, sometimes its slow, other times its fast-ish.

    Will it get better as the brakes bed in?

    Should I replace the fluid? I have never done that on any car Ive ever had. Would it make any difference?

    Is it a servo problem or a vac leak or too much vac?!?!?!

    MOT on monday so any help would be very much appreciated.

    Cheers guys.

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    Brake fluid should be changed every 2 years.

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    Regular Member Ste's Avatar
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    Changing the fluid will have no effect, as long as the current system is air free.

    The only thing I can possible suggest is that the action of the servo assistance is causing the master cylinder to leak around the cylinder seals. Extreme, but it's the only thing that can cause the pedal drop. If the engine is off and you press REALLY hard (both feet) does it drop then?

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    Quote Originally Posted by Ste View Post
    Changing the fluid will have no effect, as long as the current system is air free.
    Thought you were supposed to change the brake fluid not because of air in the system but because brake fluid is hygroscopic and over time it looses efficiency due to it absorbing moisture?

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