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Old 09-07-2015, 01:29 PM   #1
1960chevypanel
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Dual master cylinder fluid?

Anyone using anything special in their dual master/clutch cylinders? Just went to top mine off and realized I never gave it a second thought before... What's the best fluid to use?
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Old 09-07-2015, 01:47 PM   #2
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Re: Dual master cylinder fluid?

Dot 3 brake fluid.

K
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Old 09-07-2015, 04:56 PM   #3
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Re: Dual master cylinder fluid?

Second that on DOT 3.
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Old 09-09-2015, 01:06 PM   #4
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Re: Dual master cylinder fluid?

the only difference between dot 3 & 4 is 4 has a higher boiling point.
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Old 09-09-2015, 02:37 PM   #5
1960chevypanel
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Re: Dual master cylinder fluid?

Yeah I remember reading a debate about this a few years ago, but I couldn't find my way back to the thread. Someone was arguing for using Dot 5 fluid but I didn't recall the reason. Higher temp makes sense. This is a reg duty truck so I'll stay with Dot 3. Thanks
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Old 09-10-2015, 10:58 AM   #6
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Re: Dual master cylinder fluid?

a good read http://www.gomog.com/allmorgan/brakefluids.html
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Old 09-10-2015, 12:29 PM   #7
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Re: Dual master cylinder fluid?

Quote:
Originally Posted by 1960chevypanel View Post
Yeah I remember reading a debate about this a few years ago, but I couldn't find my way back to the thread. Someone was arguing for using Dot 5 fluid but I didn't recall the reason. Higher temp makes sense. This is a reg duty truck so I'll stay with Dot 3. Thanks
I would not recommend Dot 5, which is silicone based.

a) Silicone fluid does not mix with conventional fluids, so you have to flush the whole thing out.
b) General Motors would recommend that you rebuild, replacing any seals AND HOSES that had been in contact with the previous conventional fluid
c) I have had bad experiences with Dot 5 (failed master cylinders on a regular basis). Going back to Dot 3 eliminated those problems.

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Last edited by Keith Seymore; 09-22-2015 at 02:26 PM.
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