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Brake Light


fredj

Brake Light  

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Friend just called from North Carolina. Brake light won't go off. In checking,brake fluid was very low. He thinks this is the problem. The question is can he use synthetic fluid on a 1988 R1100RT. Manual says to use nothing but DOT 4 but mentions nothing about using synthetic fluid.Everything he's found so far is synthetic.He even found a DOT 5 which claims to out perform DOT 3 and DOT 4, but again it's synthetic. If synthetic isn't a problem could he use the DOT5? I need some quick answers as he's stuck in a WAL MART parking lot in Ashville North Carolina. Yhanks in advance for your assistance.

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Firefight911

Do not use DOT5!!!!!!!!!!!!!!!

 

You can use any brake fluid that indicates it is DOT3 or DOT4, even if it states that it is synthetic.

 

Do not use DOT5!!!!!!!

 

DOT4 has a higher boiling point over DOT3. DOT 5 does not adsorb water like the others, but is incompatible with DOT3/4.

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And buy the smallest container he/you can as what will not get used gets thrown away.

This stuff is very hygroscopic ( sucks up moisture from the air).

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