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Old 03-13-2009, 10:22 AM   #1
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workhorse/chevy chassis dot3 or dot4

I do believe the manual calls for dot 3, Dot4 I read in another post absorbs water faster? but boils at a higher temp?
I intend to at least swap out the reservoir fluid for now and as soon as I can get someone to help bleed and flush the lines I will finish flushing.

Should I go with dot 4 or dot 3?
I have read so much contridiction on this subject and am not sure which is better?
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Old 03-13-2009, 11:07 AM   #2
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Dot 4
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Old 03-14-2009, 02:05 AM   #3
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Quote:
Originally Posted by Flattrip View Post
I do believe the manual calls for dot 3, Dot4 I read in another post absorbs water faster? but boils at a higher temp?
I intend to at least swap out the reservoir fluid for now and as soon as I can get someone to help bleed and flush the lines I will finish flushing.

Should I go with dot 4 or dot 3?
I have read so much contridiction on this subject and am not sure which is better?
check the CASTROL website for dot4 lma (low moisture affinity) brake fluid. this is what i am using. it is very reasonably priced and is available at most any auto supply store.
it took 9 and 1/2 12 oz cans to change the reservoir and flush the calipers on my moho.
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Old 03-14-2009, 09:28 AM   #4
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I was at the autoparts store ready to buy fluid and I spotted synthetic from valvoline. It says it has a lower moisture absorbency rate and boiling pt of 480 degrees.


Thanks Jon and Dan -- That castrol sounds good and from the data sheet appears to have a bp of 509 which is better than the valvoline. I'll have to check later
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Old 03-14-2009, 09:34 AM   #5
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All brake fluid is sythetic........but not shown on all brands...
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Old 03-14-2009, 09:36 AM   #6
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I changed mine to the Valvoline Dot 4 and flushed the entire system ...
BTW it was pretty dark...
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Old 03-14-2009, 09:38 AM   #7
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That is true, all currently available brake fluid is synthetic.

I wrote this piece is response to Whaler:

Quote:
Originally Posted by Whaler View Post
,WE NEED A BETTER BRAKE FLUID!!!If it exists.
Whaler, Well "one" better brake fluid does exist. It's made by Motorcraft. It's Ford DOT3 brake fluid. It has a boiling point of 550° which is the same temperature as DOT5. The stuff is expensive BUT it's the best.
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Old 03-14-2009, 10:25 AM   #8
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Interesting page here:

http://forums.hybridz.org/showthread.php?t=103862
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Old 03-14-2009, 12:44 PM   #9
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Ford in a Chevy? shhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhh

If we do, we better not tell hehe
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Old 03-14-2009, 06:41 PM   #10
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Here is the data sheet on the oem fluid.


http://www.acdelcotechconnect.com/pd..._delco_sup.pdf
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Old 03-15-2009, 01:28 PM   #11
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Castrol was a little hard to find in my area, Pep boys had it. I will give it a go
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Old 03-16-2009, 06:17 AM   #12
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Unless you plan to do some hard braking or do not plan to change very often DOT 3 from Wal Mart at $3.50 a quart is all you need. I have started to change mine every year. We are looking at $12 and 30 mins of work.

For this last change/flush I went with some DOT 4 as it was on sale at the local autoparts store.
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