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Question on Slave Cylinder replacement(clutch), bleeding procedure

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Old Jul 12, 2008 | 05:48 PM
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From: Aspen, CO
Default Question on Slave Cylinder replacement(clutch), bleeding procedure

So i realize that this doesn't quite fit in here(not sure exactly where it does) but this was always my favorite forum due to the locals here and their general wealth of knowledge. Also this is not on a Honda, but rather a 2005 Mini Cooper S.

Ok so i just replaced a badly leaking slave cylinder the cooper, everything went together fine, bolted up and all. I began bleeding the system by gravity, then used some smooth pedal presses. after which i pressed and unpressed the slave cylinder(opening and closing valve where appropriate), and am no longer able to get any bubbles out of the system no matter what id do, yet.. The pedal drops right to the floor and im guessing(don't have another set of eyes) that the slave cylinder isn't moving. So re-bleed everything i can, no bubbles come out. question is now, how do i bleed the clutch master cylinder? when i disconnected the slave im sure air went in the line(and no pressure bleeder here), so how can i get the top most air out(which at this point i believe to be the problem).

When the bleeder valve is closed i can press the clutch repeatedly(slowly) and get no fluid change nor do i see any drips or leaks from other areas(certainly not the new slave). So a system leak doesn't seem to be the problem.

Any help or advice is much appreciated. HT is my first stop when my crx goes bad(or good) and im sure someone will have some great advice, so ty in advance.

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Old Jul 12, 2008 | 06:28 PM
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From: Aspen, CO
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UPDATE:

The problem lies in the master cylinder now im sure. i can see the lack of resistance(and hydrolic pressure) stems from the brake master cylinder or air in the line at the upper most part. But if there were air in the line wouldnt it be replaced with fluid with all the pumping i have done?

Is it possible that during the bleeding process i have damaged the clutch master cylinder? because it seems to not be pumping at all(pedal almost falls to the floor when you touch it).

Ideas appriciated
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Old Jul 13, 2008 | 03:13 AM
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1992Si's Avatar
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Unless you have a pressure bleeder, I believe you need 2 people to bleed the system. Just like bleeding brakes.

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Old Jul 13, 2008 | 10:21 AM
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Default Re: Question on Slave Cylinder replacement(clutch), bleeding procedure (tek_civic)

you only need 1 person to bleed anything if you do it this way:

1. Find a hose that fits tightly on the bleeder screw
2. Extend the hose to a bottle with a little brake fluid in it so that the hose is UNDER THE FLUID
3. Loosen the bleeder screw and pump away
4. Tighten it back and youre good

By having the hose under fluid it lets the air out but cant suck it back in because the bubbles rise to the top so it pushes air out and sucks fluid in. This makes bleeding really simple and effective with 1 person. Good luck.
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Old Jul 13, 2008 | 11:52 PM
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Default Re: Question on Slave Cylinder replacement(clutch), bleeding procedure (Just*Hatched)

ok. let me clarify a little. I know the procedure to bleed things such as described above. Already been there done that(the part where i said i bled system until no more bubbles), anyways i guess i was hoping to find someone who owned a mini cooper and familiar with its system.

I have already bled the slave cylinder, the issue i am having is with the master cylinder as i see no nipple or other way to bleed it. So there lies my sticking point. Im going to grab a pressure bleeder tomorrow, see if i can force an air bubble out. also i think it could be possible i have damaged my master cylinder by pressing to fast while there was air in the line(blowing out a seal, not sure still on this)
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