C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

Clutch Fluid?

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Old Apr 25, 2005 | 01:41 PM
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Default Clutch Fluid?

My car just crossed the 50k mile mark last month, and I guess I'm getting to that stage in ownership where I start replacing parts/fluids/etc. "just because"... This weekend, I thought maybe I should do the clutch and brake fluids?

Would there be any real reason to do this? Basically, what I am wanting to avoid is this situation: 50k miles down the road, I go to do some maintenance. Turns out it's worse than the mechanic realized. He says, "Boy...this coulda been prevented had you only -"

That's what I don't want to hear. Any suggestions?
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Old Apr 25, 2005 | 01:53 PM
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I just flushed mine a week or so ago. I am also at the 50K mark. I put Valvoline SynPower back in mine and it seems to be working fine. Some say you need to use the GM fill but others don’t. The bleed was a pita but I think it was worth it.

At 50k you should really consider replacing both the master and slave. The ZF Doc would recommend this also. I will probably replace both my master and slave next winter when I have more $$. The Old Lady just bled my bank account dry buying herself a new BMW but now I figure I’m set for all my future mods and new paint.
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Old Apr 25, 2005 | 02:01 PM
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Valvoline SynPower.
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Old Apr 25, 2005 | 02:17 PM
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Originally Posted by Grace91
I just flushed mine a week or so ago. I am also at the 50K mark. I put Valvoline SynPower back in mine and it seems to be working fine. Some say you need to use the GM fill but others don’t. The bleed was a pita but I think it was worth it.

At 50k you should really consider replacing both the master and slave. The ZF Doc would recommend this also. I will probably replace both my master and slave next winter when I have more $$. The Old Lady just bled my bank account dry buying herself a new BMW but now I figure I’m set for all my future mods and new paint.
don't replace the master/slave. I know, in a perfect world... but GM is having a huge problem with those that are on the shelf right now.

My hydraulics have a small leak... I don't want to upgrade to a larger leak... so I ain't buying a new one anytime soon.
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Old Apr 25, 2005 | 02:20 PM
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Originally Posted by bogus
don't replace the master/slave. I know, in a perfect world... but GM is having a huge problem with those that are on the shelf right now.

My hydraulics have a small leak... I don't want to upgrade to a larger leak... so I ain't buying a new one anytime soon.


Forgot about that.. All the more reason to wait.

Thanks for mentioning.

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Old Apr 25, 2005 | 03:08 PM
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Valvoline Synpower DOT3 +DOT 4 for both clutch and brake systems
Higher boiling point and less tendency to absorb water
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Old Apr 25, 2005 | 04:00 PM
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Thanks everybody...
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Old Apr 25, 2005 | 09:46 PM
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For the time being...I've just been siphoning out the old fluid from the reservoir, then putting in new SynPower, followed with a long series of slow clutch action sitting on a level surface. This seems to get any residual air out of the system.

The first couple of weeks (times) the fluid quickly turned black after driving; however, now it stays really clean looking.

I realize this isn't the best replacement method, but it seems to be an easy swap for now.

I've also done a similar procedure on my brake fluid and power steering fluid. I use a 99 cent turkey baster.
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Old Apr 25, 2005 | 09:56 PM
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Originally Posted by bogus
don't replace the master/slave. I know, in a perfect world... but GM is having a huge problem with those that are on the shelf right now.

My hydraulics have a small leak... I don't want to upgrade to a larger leak... so I ain't buying a new one anytime soon.
Bogus - How can I tell if the new Raybestos Clutch & Slave Cylinders have the problem you're talking about? Is there data code or some way to tell. I bought a new one sometime back and have not installed it yet.
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Old Apr 26, 2005 | 12:17 AM
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No, these are GM parts only. I don't know if the aftermarket has this problem.
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