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Old 06-24-2007, 02:38 PM
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Join Date: Jun 2007
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Dot 3 in a Dot 4 car?

I repalced my brake fluid in my 84 MB 300D with DOT 3 and then noticed later the master cylinder cap say to use DOT 4 - what is the difference between the two and what or how does it make a difference to use insteed of the other. Is it best to drain system and reboot with DOT 4?

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Old 06-24-2007, 02:55 PM
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Join Date: Oct 2004
Posts: 482
Dot 4 has a higher boiling point than dot 3. Flush it out and replace.

You can probably get away with Dot 3, but I personally wouldn't take the chance.
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Old 06-24-2007, 06:12 PM
stcbenz83's Avatar
Mercedes Euro 240D
Join Date: Mar 2006
Location: Louisville, KY
Posts: 1,056
i replaced mine with dot3&4 mix, so im not sure if theres that much of a difference. However, when i just bleed the brake system yesterday, i found some pure Dot4 brake fluid, somthing i couldn't find the last time.
1983 Euro 240D 277K
2016 Mazda 6
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Old 06-24-2007, 07:01 PM
jbaj007's Avatar
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Join Date: Jun 2001
Location: Santa Monica, CA
Posts: 2,053
This is a nice, very direct write-up of brake fluid:

The Golden Rule

1984 300SD (bought new, sold it in 1988, bought it back 13 yrs. later)
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