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Old 03-24-2006, 11:24 AM   #1
kheff46
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Default DOT 4 to DOT 5

on some bottles of DOT 5 it says for use on replacement systems or systems originally equipped with DOT 5.
-what constitutes a replacement system?
-completely cleaning and refilling?
-new parts only?
whats up guys? does DOt3/4 breakdown seals or react with DOT 5 or is there a difference in the glass beads vs silicon in DOT 5? a little help here!

oh, this is for my swap. does this count as a conversion?
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Old 03-24-2006, 11:29 AM   #2
Jaxx
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dot 5 ->silicone->bad
dot 5.1->not silicone ->good

silicone is only good for augementation...
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Old 03-24-2006, 11:35 AM   #3
kheff46
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what is dot 5.1?
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Old 03-24-2006, 06:47 PM   #4
sidewayz
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stick with dot 3/4... dot 5 just has a higher boiling point..which you will never see in any street car.
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Old 03-24-2006, 07:10 PM   #5
Mulder
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DOT 5 is silicone fluid and is NOT compatible with conventional DOT 3 or 4. It also cannot be used in systems that have had DOT 3 or DOT 4 in them, they don't mix and all the seals in the system will be destroyed. It's also not compatible with ABS.
So, don't use it.
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Old 03-24-2006, 09:16 PM   #6
JeremyRS
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^
l

+1
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Old 03-24-2006, 09:23 PM   #7
Jaxx
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right but 5.1 is not silicone

http://en.wikipedia.org/wiki/DOT_5
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Old 03-24-2006, 11:54 PM   #8
subbyspeed
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stick with 3 or 4. No need for 5.anything. Unless you plan on running the 24 hours of Nurburgring. Which i highly doubt.
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Old 03-25-2006, 12:45 PM   #9
speedyHAM
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Dot 5 brake fuild is for show cars, it doesn't absorb water like Dot 3, 4, and 5.1 so it won't corrode the brake system.

Dot 5.1 is for race cars, much higher dry boiling point and usually (from what I've seen) a lower wet boiling point than Dot 3 or 4 with a higher rate of moisture absorption. Race teams don't care because they will change out the brake fuild every race.

Stick with Dot 4 for anything street driven.
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Old 03-25-2006, 01:26 PM   #10
kheff46
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thanks!
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