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Author Topic: Dot 3, Dot 4, Dot 5 or Dot 3/4  (Read 1909 times)
Connito
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« on: May 14, 2014, 11:53:41 AM »

After reading about it a bit, I think I will go with Dot 3 fluid. What are you using and why? There is a Valvoline Dot 3 and 4 fluid I am considering buying. Why shouldn't I? - http://shop.advanceautoparts.com/p/valvoline-dot-3-and-4-synthetic-brake-fluid-12-oz.-601457/89016680-P?searchTerm=dot+4
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knowsnothing
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« Reply #1 on: May 14, 2014, 01:40:13 PM »

I use Dot 3.  I use dot 3 because that's what the manual says, i would have replace all the hoses etc if i switched, and because Anders said so. 
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Connito
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« Reply #2 on: May 14, 2014, 01:48:24 PM »

Thanks. Since I am replacing everything but the master cylinder, I will use that Dot 3/4 Valvoline fluid. Somebody stop me before it's too late!
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frostypuck
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« Reply #3 on: May 14, 2014, 05:56:27 PM »

I use Dot 3.  I use dot 3 because that's what the manual says, i would have replace all the hoses etc if i switched, and because Anders said so. 

The manual says that because DOT 4 hadn't been invented yet.

Just do't use DOT 5, with anything that's had DOT 3 or 4 in it, and you'll be fine.
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Connito
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« Reply #4 on: May 14, 2014, 06:38:53 PM »

That was my take on the whole thing also. However, they didn't have that 3/4 stuff in the store, so I just got the dot 3

Thanks!
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azure
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« Reply #5 on: May 14, 2014, 09:47:35 PM »


Just do't use DOT 5, with anything that's had DOT 3 or 4 in it, and you'll be fine.

+1
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andy750
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« Reply #6 on: May 14, 2014, 10:16:42 PM »

And whatever you do dont ever ever use DOT 6!!! Unless you want to meet the Corona Girls  and end up with a compromising tattoo and end up working for Follywood  Grin Cool
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Connito
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« Reply #7 on: May 14, 2014, 10:22:11 PM »

DOT 6 it is then!!!
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mick750F
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« Reply #8 on: May 20, 2014, 05:35:18 PM »

   C'mon now Andy, you love my tattoo. Jealous you are...

   Stick with the dot 3 or 4 Peter. I once went to silicone and it was a pain to go back to non. Some say that you can't but I haven't had a problem after multiple flushings of the system.
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« Reply #9 on: June 16, 2014, 07:42:55 AM »

So no one accuses me of not following up…

I rebuilt my front calipers and rear drums on my '70 MG a couple weeks ago. Having no idea what brake fluid was in there, and the fact that I replaced all the wet parts, and at least 80% of the brake lines, I figured, flush out the old and replace with DOT 5. Here is the bottle I flushed into after it had sat for several days…


Old, probably DOT 3 or 4 or 3/4 and the clear DOT 5 had separated. I'm guessing that is at least some of the reason not to mix grades of fluid, I suspect the synthetic components of the new style fluid prevent it from staying mixed.

Just thought it was interesting,
Chris
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Connito
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« Reply #10 on: June 16, 2014, 07:58:41 AM »

Interesting indeed!
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azure
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« Reply #11 on: June 17, 2014, 06:36:05 AM »

I wonder if the reason has something to do with 3 and 4 being hygroscopic,  while the 5, which I think is silicon based, is not?
I wonder if it's the water and oil antipathy thing in action?
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andy750
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« Reply #12 on: June 17, 2014, 03:31:56 PM »

I think its more like Chris and brake fluid antipathy  Grin
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azure
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« Reply #13 on: June 17, 2014, 06:32:54 PM »

Fwiw, I saw a urine sample yesterday that looked similarly.
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mick750F
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« Reply #14 on: June 17, 2014, 08:08:40 PM »


   Jeebers Ben, you said you wouldn't mention that to anyone.

   Chris, if you're mucking around with that MG in order to enjoy it why stop at 80% of the lines? Bite the bullet and replace them all so you know they're all good. After all it's really a four wheeled two seater bike...right? Seriously with all this old stuff we seem to like I like to bring important systems up to date whenever possible.

Cheers and beers...Melder
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