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Clutch bleeding problem

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Old May 5, 2023 | 05:38 AM
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Default Clutch bleeding problem

Hi,

I have replaced the clutch and slave cylinder in 2006 corvette (LS3). I can't bleed the clutch. I tried all possible ways to do it:
1. pressure container with fluid from the top and unscrew the bleeder on the bottom - the fluid goes through the line and drips in the bottom. The clutch is not working - zero resistance on the clutch pedal.
2. The manual method with push the pedal, unscrew the bleeder, screw the bleeder, pedal up, pedal down etc.... - nothing happens. The pedal has no effort.
3. ranger method - with pumping pumping for few minutes. Still no pressure.

I noticed that while I push the pedal - air/fluid is sparkling from the cap vent, and when I pull the pedal up, the air comes into the container through the vent.

I assume to cap is faulty and I am not able to bleed the clutch because all the pressure I try to build up with the pedal is escaping through the cap vent?

Am I missing sth ?

I also can't find the cap as a replacement part - is it possible to purchase only the cap without buying the whole master cylinder?

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Old May 5, 2023 | 06:44 AM
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I had the same problem after my clutch swap on my 07 z06. Turns out it was a bad master cylinder. Replaced that and immediately started getting a pedal back.
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Old May 5, 2023 | 07:05 AM
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An aftermarket remote bleeder makes this procedure way easier
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Old May 5, 2023 | 07:26 AM
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Originally Posted by 449er
An aftermarket remote bleeder makes this procedure way easier
I don't think so. Remote bleeder only makes it easier to bleed because you don't need to remove the exhaust and put your hand between torque tube and body and jump under the car every pump of the clutch. I couldn't bleed the clutch at all so even with the remote bleeder I would have the same issue.
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Old May 5, 2023 | 08:30 AM
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You said you replaced the slave. Did you make sure that the connection from the slave to the master was fully seated?
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Old May 5, 2023 | 08:34 AM
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Originally Posted by Spaceme1117
You said you replaced the slave. Did you make sure that the connection from the slave to the master was fully seated?
IT was really hard to push fully push it together, but it is seated. I inserted the retaining clip and pulled hard to check if it holds. If it wasn't fully seated I don't think I was able to push the pedal?

Also if it was not fully seated would the fluid drip out from the bleeder ?

Initially when I installed the slave, the connector was not fully seated and I was not able to push the pedal.
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Old May 5, 2023 | 12:52 PM
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Originally Posted by lambda1
I noticed that while I push the pedal - air/fluid is sparkling from the cap vent, and when I pull the pedal up, the air comes into the container through the vent.

I assume to cap is faulty and I am not able to bleed the clutch because all the pressure I try to build up with the pedal is escaping through the cap vent?
It should not be under pressure. You can operate the clutch with the cap removed.

The reservoir is isolated from the hydraulic circuit at the beginning of the pedal stroke. It looks like your master cylinder has failed.
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Old May 8, 2023 | 03:44 AM
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Thank you all for your replies. I am ordering new master cylinder and see if that's the issue.
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Old May 8, 2023 | 05:21 AM
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Does it have the old master cylinder or the new one that was supposed to be replaced under the recall?
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Old May 8, 2023 | 05:22 AM
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Originally Posted by baxsom
Does it have the old master cylinder or the new one that was supposed to be replaced under the recall?
I don't know. Not my car. How can I check this ?

I can't find the info about that recall for a clutch master cylinder. I could find only a brake line interfering with the exhaust manifold. Do yo have some source ?

Last edited by lambda1; May 8, 2023 at 05:29 AM.
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Old May 8, 2023 | 06:38 AM
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Originally Posted by lambda1
I don't know. Not my car. How can I check this ?

I can't find the info about that recall for a clutch master cylinder. I could find only a brake line interfering with the exhaust manifold. Do yo have some source ?
Old MC will have a clear/white reservoir. The updated part has a black reservior.

Bulletin is attached.
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MC-10123488-9999.pdf (234.4 KB, 180 views)
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Old May 23, 2023 | 02:02 AM
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Hi.
i replaced the master cylinder with new one from LUK.
All works fine, I even didn't have to bleed the clutch just did the ranger method by pimping for a few minutes.

Many thanks for your help

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