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Clutch fluid - options?

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Old Jul 28, 2003 | 08:18 AM
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Default Clutch fluid - options?

I posted this here since I figured you road racers would have the answer to my question.

What type of brake fluid do you all use in your clutch hydraulic system? With the DOT3, I've found that all the heat from the tranny might be causing my clutch fluid to boil since the slave cylinder is on my bell housing. I just flushed it out with some fresh fluid (at 13K miles), and the difference is night and day. However, my proactive mindset knows it'll happen again, and I'd like to take any steps to minimize the number of times I'll be bleeding the clutch system in the future. Do any of you use DOT4 fluid?

TIA
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Old Jul 28, 2003 | 08:22 AM
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Default Re: Clutch fluid - options? (John)

I use plain-jane Castrol brake fluid. I've never had any problems.
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Old Jul 28, 2003 | 08:33 AM
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Default Re: Clutch fluid - options? (Crack Monkey)

I use Honda fluid and flush it at least once a year.
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Old Jul 28, 2003 | 09:23 AM
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Are there any disadvantages to using a higher-temp brake fluid, or will I be risking possible damage to the clutch master and slave cylinders if I don't use the OEM DOT3 fluid?
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Old Jul 28, 2003 | 09:25 AM
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Default Re: (John)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by John &raquo;</TD></TR><TR><TD CLASS="quote">Are there any disadvantages to using a higher-temp brake fluid, or will I be risking possible damage to the clutch master and slave cylinders if I don't use the DOT3 Nissan fluid?</TD></TR></TABLE>

I doubt it. I dare say that the seals in the clutch master and slave are made of the same materials and on the same line as the seals for the brake components. Of course someone will say I am wrong - but I bet that person alos has little fuzzy orange hats for his clutch and brake master cylinders to keep them warm on those cold days.

With that said I run ATE Super Blue in my clutch system. Why? Because that is what is in my brake system and I don't want to have to carry 2 different kinds of fluid with me.
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Old Jul 28, 2003 | 04:24 PM
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Default Re: (Evil Drew M)

I don't know how applicable this is to Hondas with their separate resevoirs for brake and clutch fluid, but my BMW runs both the clutch and brake system off the "brake fluid" resevoir. I use Ate SuperBlue with no ill effects.

I think I boiled the (I guess) BMW stock fluid in there during a hot autocross school that didn't give any airflow around the tranny. After bleeding, no problems whatsoever.
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