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#1
03-28-2006, 10:34 PM
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Dot 3 or Dot 4?
I am getting ready to replace my master cyl. I know there is dot3 in there now. My local MB dealer says dot 4 is better, but wasn't very emphatic about it.
Is dot 4 really better? What is the difference? What is the best way to get all of the dot 3 out? I have heard that mixing 3 and 4 is bad. Thanks, Mark
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85 300D (California) 220k 03 Silverado 1500 Xcab Z-71 Guzzler 90k Real American steel(made in Canada  )03 Suburban 1500 4x2 Guzzler 170k Real American steel(made in Mexico )Diamondback hybrid Element skateboard(mileage unknown) Good news for diesel owners...There's no such thing as cold...only the absence of heat!  "Beer is proof that God wants us to be Happy." Benjamin Franklin "Possession....the King of sin." The Avett Brothers 
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#2
03-28-2006, 11:05 PM
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DOT 4 is what the cap says...
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I'm not a doctor, but I'll have a look.  '85 300SD 245k '87 300SDL 251k '90 300SEL 326k Six others from BMW, GM, and Ford. Liberty will not descend to a people; a people must raise themselves to liberty.[/IMG]
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#3
03-28-2006, 11:06 PM
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dot4 has a higher boiling point. the best way would be to use a sucktion device and then replace with dot4. mixing will not harm. stay away from dot5. its silicone fluid and will gum up the brake system
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have no worries.....President Obama swears "If you like your gun, you can keep it
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#4
03-28-2006, 11:07 PM
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That pressure bleeder is one of the best tools I have ever purchased. ~$50 shipped to my pad.
__________________
I'm not a doctor, but I'll have a look. '85 300SD 245k '87 300SDL 251k '90 300SEL 326k Six others from BMW, GM, and Ford. Liberty will not descend to a people; a people must raise themselves to liberty.[/IMG]
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#5
03-28-2006, 11:20 PM
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No sense tryin to save a few bucks on brake fluid...it can come back and bite you, hard. Has anyone tried DOT5.1? Not to be mistaken with the silicone DOT5, its supposed to have a higher boiling point than DOT3, DOT4, and DOT5 and is compatible with Dot3 and Dot4.
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1985 CA 300D Turbo , 213K mi
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#6
03-28-2006, 11:22 PM
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Quote:
__________________
have no worries.....President Obama swears "If you like your gun, you can keep it
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#7
03-28-2006, 11:22 PM
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I wish AutoZoo carried Dot 4 in big containers, then I could put it to them for their gift card promo.
__________________
I'm not a doctor, but I'll have a look. '85 300SD 245k '87 300SDL 251k '90 300SEL 326k Six others from BMW, GM, and Ford. Liberty will not descend to a people; a people must raise themselves to liberty.[/IMG]
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#9
03-28-2006, 11:33 PM
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Quote:
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#11
03-28-2006, 11:36 PM
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Quote:
Well I have all these Euro cars and they all use DOT 4... That Valv says meets or exceeds DOT 3 & 4. So is it mkay to use? 
__________________
I'm not a doctor, but I'll have a look. '85 300SD 245k '87 300SDL 251k '90 300SEL 326k Six others from BMW, GM, and Ford. Liberty will not descend to a people; a people must raise themselves to liberty.[/IMG]
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#12
03-29-2006, 12:19 AM
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my cap says DOT3. So i use ATE Dot 3 (blue fluid).
__________________
Mike ---------------------------------- 1975 200 - Sold (no pix); 1978 200 - Sold - http://www.pbase.com/hboy/redbaron 1979 300TD - Sold http://www.pbase.com/hboy/greenwagon http://www.geocities.com/hboy726/300TD.html 1985 230E - now my daily driver...
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#13
03-29-2006, 12:50 AM
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#14
03-29-2006, 11:48 AM
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DOT 4.
Even if the seal on the large container is broken, it's not going to absorb water any faster than you brake system normally does. You realize there's a small hole in the cap of the resevoir on the MC? It's not a closed system. You're probably never going to need the extreme performance of a DOT 5, you'd be throwing your money away. Mercedes probably isn't that emphatic about DOT 4 over 3 either because the main thing to be concerned with is renewing the fluid annually.
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63 220S W111 76 300D W115 2013 VW JSW TDI M6 previously- 73 280 SEL 4.5 86 300E 5 speed 2010 VW Jetta TDI M6
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#15
03-29-2006, 12:13 PM
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dot five
is silicone and i wouldnt recommend it for benzes. i have used it in the past and had some problems. the seals want to swell and stick in the calipers a little too much, then the fuid heats up, expands and causes dragging brakes.
it works great in drum brake american iron though. tom w
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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual. [SIGPIC]..I also have a 427 Cobra replica with an aluminum chassis.
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