S-Class (W140) 1991-1999: 300 SD, S 350TD, 300 SE 2.8, S280, 300 SE 3.2, 300 SEL 3.2, S320, S320L, 400 SE, S420, 400 SEL, S420L, 500 SE, S500, 500 SEL, S500L, 600 SE, S600, 600 SEL, S600L, 500 SEC, 600 SEC

break fluid dot4 or dot5.1

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Old 05-06-2004, 01:28 AM
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1995 w140 s500
break fluid dot4 or dot5.1

guys which one would you recommend on a s500 1995?
Old 05-06-2004, 02:14 AM
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No Dot 5! It's a silicone. Mercedes have what they call Dot 4 Plus which is what I use. However, any Dot 4 brake fluid should do.

Last edited by BudC; 05-06-2004 at 09:33 AM.
Old 05-06-2004, 08:53 AM
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1995 w140 s500
what about dot 5.1 what is that? is it better then dot 4 or compatible with benz brake fluid?
Old 05-06-2004, 09:33 AM
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Oops, I didn't know that Dot 5.1 was a non-silicone brake fluid. It's a synthetic that's compatible with Dot 3 and Dot 4 and is supposed to be long life and have a lower viscosity than Dot 3 and 4 which is claimed to work better in the micro valves of ABS braking systems.

It looks like using it would be like changing to a synthetic motor oil, i.e. the same kind of benefits.

I wonder what Mercedes use in the new SBC braking systems.

Last edited by BudC; 05-06-2004 at 09:40 AM.
Old 05-06-2004, 04:43 PM
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NO NO NO!!!! DONT USE DOT 5! Thats for show/restored/vintage cars, its a non abbrassive/corrosive formula. It holds water in it and should not be used on any car other then specified. Use dot 4- I would recommend ATE Super Blue
Old 05-06-2004, 07:08 PM
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I thought the same thing but DOT 5.1 isn't just a version of DOT 5.0.

5.1 is a synthetic brake fluid that's fully compatible with DOT 3.0 and 4.0. It's not silicone.

It apparently has a lower viscosity than the other DOT fluids which makes it work better with ABS brake systems.

Even so, the DOT 4 Plus that Mercedes dealers sell has worked just fine in my ABS-equiped 300E.

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