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Thread: Master Cylinder

  1. #1
    Regular Member parsco's Avatar
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    Default Master Cylinder

    My mate who owns a garage did my 314mm upgrade for me this afternoon. Got a problem though The pedal is sooooo soft, almost until i hit the floor. He ended up bleeding them about 4 times to make sure there was no air in the system. The brakes are worse than they were before
    He said that the master cylinder has probably gone. Anybody else had this problem? Could it be anything else?





    Sorry can't spell cylinder lol

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    Full Member Big Sig's Avatar
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    Only time I have known this is when people puch the piston back in rather than release the nipple so the fluid goes back through the master cylinder. Although it has double seals it shouldn't happen but its still possible. Did he do this as i cannot understand that it would just go when the new kit was fitted?
    Now I need a turbo to keep up!

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    Regular Member parsco's Avatar
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    To be fair (and i also told him) the pedal was quite "spongy" (had to push it down quite a bit before any bit) but it was no where near as bad as this . He said that if it was bad before then when they bleeded it that would put strain on the master cylinder probably causing the seals to go

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    Quote Originally Posted by Big Sig View Post
    Only time I have known this is when people puch the piston back in rather than release the nipple so the fluid goes back through the master cylinder. Although it has double seals it shouldn't happen but its still possible. Did he do this as i cannot understand that it would just go when the new kit was fitted?
    Can you expand on that please, at what should you release the nipple - do you mean when bleeding or are you referring to something else, e.g. when fitting the calipers?

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    Regular Member gtr1000's Avatar
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    Vehicle : Insignia

    Trim : Sri

    Engine : 140 Ecoflex S/S

    Year : 2013

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    Parsco - I've put a post up on this on your other thread http://www.vectra-c.com/forum/showth...850#post789850 HTH

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    Regular Member gtr1000's Avatar
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    Vehicle : Insignia

    Trim : Sri

    Engine : 140 Ecoflex S/S

    Year : 2013

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    Quote Originally Posted by Thomas1 View Post
    Can you expand on that please, at what should you release the nipple - do you mean when bleeding or are you referring to something else, e.g. when fitting the calipers?
    Thomas - what he means is that when pushing the pistons back, say for new pads, it's best to clamp off the rubber flexy hose by the caliper, open the bleed nipple and psuh cylinders back. Then close bleed nipple, release clamp. This method can also reduce the risk of any contaminants been pushed into the small portings that make up some components of the ABS circuits.

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    Ex Vec-C Admin & Founder GARY3306's Avatar
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    You can check if the master cylinder seals are gone (which I doubt) as follows. Clamp off each flexi hose at the four wheels with brake clamps. The brake pedal should now be rock hard, if it isn't and still has significant travel or goes to the floor, then the Master cyl is kaputt. If the pedal is rock solid (you will get a mm or two of travel but hardly any) then MC is fine. Now to trace which wheel(s) are giving the problem, take off the clamp furthest away from the MC, check the pedal. You will have slightly more movement. Put that clamp back on now and remove the next furthest clamp away from the MC, again check the pedal, put that clamp back. Do all the wheels like this until when you take one clamp off the pedal drops significantly. This will be the wheel(s) that require attention and I'll lay money on it that it's air in the system. If you have access to a good pressure bleeder, do it that way. A pressure bleeder will not move the MC internals
    [SIGPIC]VX<font color=Red>R</font> with added Courtenay <img src=https://www.vectra-c.com/forum/images/smilies/biggrin.png border=0 alt= title=Big Grin class=inlineimg />

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    On that same subject, the hoses on mine are rock hard - they flex, but you can't compress them by hand for example. Should you still clamp them when necessary...it's going to take a lot of pressure - is this ok or do I risk damaging them?

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    Ex Vec-C Admin & Founder GARY3306's Avatar
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    You won't be able to compress them by hand mate, or if you can I won't mess with you . Using the correct hose clamps that are designed and made for the job, it will not or should not cause problems. Never use mole grips because it will collapse the inner wall of the flexi and cause restricted fluid movement and you'll get a sticky brake on that wheel because the fluid cant recuperate properly.
    [SIGPIC]VX<font color=Red>R</font> with added Courtenay <img src=https://www.vectra-c.com/forum/images/smilies/biggrin.png border=0 alt= title=Big Grin class=inlineimg />

  10. #10
    Regular Member parsco's Avatar
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    I've gone out and checked the car this morning.

    1) I put my foot on the brake pedal (pretty much went all the way to the floor) and it's softer than pushing the clutch.

    2) I pumped the brake pedal, it became slightly harder for about 2 seconds then i was able to press it again as No. 1 above.

    3) Took the car for a drive around the block. Coming up to first junction doing about 50-60mph foot pretty much goes to the floor on the brake, so i tapped it a couple of times and it became hard again and brakes were awesome!!! However, then the pedal went like No.1 again.

    If there was air in the system i would be able to pump the pedal and it would then become hard and stay like it longer than a couple of seconds. When the brakes were bled it was done with a pressure bleeder.

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