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Air leak in Clutch System


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theorifice
New User

Oct 22, 2012, 8:27 AM

Post #1 of 6 (2409 views)
Air leak in Clutch System Sign In

I have a 2005 Pontiac Sunfire that appears to be sucking in air into the clutch lines.

I've bled the system twice and each time, pressure is restored for a day or two of use before I start feeling pressure loss. There are no apparent leaks and fluid levels stay consistent so I'm guessing that air is being sucked in to the system.

Not sure if it's relevant, but if I have the reservoir cap off and quickly disengage the clutch pedal, I can see fluid splashing out of the reservoir.

How does one diagnose an air leak in the clutch lines?


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Oct 22, 2012, 8:36 AM

Post #2 of 6 (2402 views)
Re: Air leak in Clutch System Sign In

The Clutch Master is about the only thing that can do that.



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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

Oct 22, 2012, 8:47 AM

Post #3 of 6 (2385 views)
Re: Air leak in Clutch System Sign In

Hmmm? You've bled it twice and it works better. Are you sure when you bled it that air really came out at all? Difficult to believe that air can get in without fluid evidence leaking out but can't say that it can't happen.

It should be using DOT 3 brake fluid which if you are in frequent rains would likely wash away as it's not an oil and will wash off with water. If anything but the correct product has ever been used all rubber parts holding or sealing fluid would give out perhaps slowly all depending how much of what might have contaminated it.

That's a possibility. The master or slave can fail to make or hold pressure and not leak also. Guessing it begins to fail to disengage clutch, hard shifting noted and less pressure required on the clutch pedal. If it pumps up and behaves for a bit doing nothing else and NO contamination possible pick the easiest of master or slave first and check flex hose or just do it all,

T



Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Oct 22, 2012, 9:01 AM

Post #4 of 6 (2377 views)
Re: Air leak in Clutch System Sign In

It can pull air in through the back of the master. That's the only place it ever happens though.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

Oct 22, 2012, 9:13 AM

Post #5 of 6 (2369 views)
Re: Air leak in Clutch System Sign In

Think you are right and would probably show some dampness if just pulled out some now. Never did get a lot of any of these as nobody in MA could drive a standard to save their life! Are you kidding - more than two pedals to chose from at random!

If that wasn't true it would be funnyCrazy

T


theorifice
New User

Oct 22, 2012, 9:24 AM

Post #6 of 6 (2363 views)
Re: Air leak in Clutch System Sign In

There was definitely air released when bled. I've bled many hydraulic lines before and it bled like any other.

I'll change out the master cylinder and hope for the best. At least it's not the slave!

Thanks for the replies.






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