Dot 3 or Dot 4 brake fluid?


Information and questions on GL1800 Goldwings (2001-Present)
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bayoudave
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Dot 3 or Dot 4 brake fluid?

Postby bayoudave » Sat Sep 29, 2012 10:19 am



I need to replace the brake fluid on my 2002 1800. On the 1992 1500 it said to use Dot 4 only. Is that true for the 1800 as well?


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WingAdmin
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Re: Dot 3 or Dot 4 brake fluid?

Postby WingAdmin » Sat Sep 29, 2012 11:35 am

bayoudave wrote:I need to replace the brake fluid on my 2002 1800. On the 1992 1500 it said to use Dot 4 only. Is that true for the 1800 as well?


Honda specifies DOT4 for the GL1800 as well. DOT4 is more or less compatible with DOT3 (at least as far as your bike is concerned) - it has a higher boiling point, and is less hygroscopic, but is compatible (the two can even be mixed). Whatever you do, do not use DOT5.

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thrasherg
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Re: Dot 3 or Dot 4 brake fluid?

Postby thrasherg » Sat Sep 29, 2012 11:25 pm

There are 2 types of DOT 5, one is silicon based and does not absorb water but is highly caustic to paintwork, the other can be mixed with regular mineral oil based DOT 3 & 4 fluids.. That's just for information, as Wingadmin suggested, I would just go with DOT 4, it's what Honda recommends and is cheap and easy to find..

Gary

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WingAdmin
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Posts: 17045
Joined: Fri Oct 03, 2008 4:16 pm
Location: Strongsville, OH
Motorcycle: 2000 GL1500 SE
1982 GL1100A Aspencade (sold)
1989 PC800 (wife's!)
1998 XV250 Virago (sold)
2007 Aspen Sentry Trailer

Re: Dot 3 or Dot 4 brake fluid?

Postby WingAdmin » Sun Sep 30, 2012 10:26 am

thrasherg wrote:There are 2 types of DOT 5, one is silicon based and does not absorb water but is highly caustic to paintwork, the other can be mixed with regular mineral oil based DOT 3 & 4 fluids.. That's just for information, as Wingadmin suggested, I would just go with DOT 4, it's what Honda recommends and is cheap and easy to find..

Gary


The DOT5 that can be mixed with DOT3 and DOT4 is actually named DOT5.1 - it's rare and expensive.

Why they would name it DOT5.1 - I have no idea. So confusing!




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