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Buell Forum » XBoard » Buell XBoard Archives » Archive through July 12, 2006 » Brakes - Dot 3 or Dot 4 « Previous Next »

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Jcbikes
Posted on Monday, July 10, 2006 - 11:15 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)
I what to change out the brake fluids and wondered what is the difference between Dot 3 and Dot 4. I have some new Dot 3. Do I really need to put Dot 4 in the XB's brakes or will Dot 3 be ok. 10,000 miles on the bike. Could not find anything on this in the knowledge vault.
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Samiam
Posted on Monday, July 10, 2006 - 11:21 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)
I once asked the same thing to an auto mechanic about putting dot 4 in a car specifying dot 3. His answer was put in what the manufacturer specifies.

Sam
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12r
Posted on Monday, July 10, 2006 - 11:26 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)
DOT4 has a much higher boiling point and absorbs less moisture than DOT3, go with DOT4.
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Firebolteric_ma
Posted on Monday, July 10, 2006 - 12:17 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)
YOU WILL KILL THE SEALS W/ DOT3
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Jaimec
Posted on Monday, July 10, 2006 - 01:39 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)
Firebolteric_ma, I think you're thinking of DOT5, which is chemically incompatible with DOT3/DOT4. Use DOT4 because your Buell NEEDS the higher boiling point... but if you need to "top up" and you only have DOT3 available you should be fine.
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Firebolteric_ma
Posted on Monday, July 10, 2006 - 01:54 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)
yup your right..my bad..sorry! dang mondays!
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Dongalonga
Posted on Monday, July 10, 2006 - 04:28 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)
heat + moisture buildup = worn/destroyed seals; hence Dot 4 for th higher heat tolerence.
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