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1.2 sxi 2010 clutch pedal pumping :(

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  • [Corsa D 2006-2014] 1.2 sxi 2010 clutch pedal pumping :(

    Hello all first post so go easy Having trouble with my corsa D....changed the waterpump at the weekend due to a leak. fixed that problem. Randomly the next day i noticed the clutch pedal needing a few pumps to disengage the clutch. Tried a bleed and did not help (although i am not sure the bleed was perfect but its no worse than before).

    If i stomp on the pedal it builds up pressure straight away no problem and works as normal. If i press the pedal slowly it falls to the floor with a little pressure buildup at the end. Fluid level is right at the top of the cap and i have never noticed and loss of fluid anywhere. I can drive the car perfectly normally with a single hard stomp on the clutch pedal to change gear but if i forget and rest my foot on the clutch pedal lightly it drops easily to the bottom of the travel (then i let it back up and stomp once again to change gear).

    My initial though and hope is the master cylinder - perhaps an internal piston seal that is worn? i don't want to chuck time and effort at that really if its the slave but is there any easy way to diagnose which one is most likely FUBAR? No visible fluid leaks anywhere.

    I am struggling to think how anything i did changing the water pump could have affected the hydraulic system! perhaps the car being up on a ramp for ages on one side caused air migration in the hydraulic lines or something or maybe its just good old sods law

    thanks for all the help

  • #2
    Welcome to the Forum.

    What you describe, is a classic case of clutch master cylinder failure, had it been the slave cylinder, there would have been a loss of fluid.

    Stamping your foot on the pedal creates sufficient pressure to expand the seal and operate the clutch, but if you gently and progressively press the pedal over (say) five minutes, you would probably find that the pedal reached the floor without even starting to disengage the clutch.

    The good news then, is that it is easier to change the master cylinder than the slave.

    Regards.

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    • #3
      Hi all, I have a similar problem, the pedal creeps to the floor or at least half way down, pull it back up and it’s fine. I found if you tap the clutch pedal it makes the issue far worse. I have replaced the master cylinder but it’s exactly the same

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      • #4
        Welcome to the Forum,

        It is quite possible that whet you describe, is down to a faulty slave cylinder, if this is the case, unfortunately it involves removing the gearbox in order to access it.

        However, before you go to that length, check that the clutch pedal is free on its pivot, and that it is returning to the fully 'out' position when you remove your foot from it.

        Regards

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        • #5
          Yes the pedal does return fully under normal operation and it can perform perfectly for 10-20 Miles then fault 5 or 6 times in half a mile, it’s very sporadic.
          I have uploaded a couple of pictures of the fluid damper which does seem to be a little damp around the pipes. However the pedal doesn’t perform as if there is air in the system, when the fault occurs if you pull the pedal back up the very next press the pedal is fine, no pumping is required

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          • #6
            What you describe, suggests that the master cylinder piston is not returning fully - it was for that reason that I suggested the pedal may be the cause, so it seems odd that you have fitted a new master cylinder, and still have the same problem.
            Next time you have the problem, it would be worth checking (if you are in a safe place to do so) what happens when you pull the pedal back manually - if you do this by hand, rather than with your foot, you may get a better idea of what is happening.
            What generally happens when a master cylinder piston does not return fully, pressure builds up in the system due to the fluid expanding if it warms up, causing the slave cylinder (callipers or wheel cylinders in the case of brakes) piston(s) to move out.

            Regards

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