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#1
10-09-2014, 09:41 AM
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Brake Fluid - what DOT # do I use for 1981 300SD?
My owners manual does not tell me. Is it DOT3, DOT4 or what? Need to replace the master cylinder.
Thx. 
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#2
10-09-2014, 09:43 AM
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dot 4
__________________
John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread "as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do! My drivers: 1987 190D 2.5Turbo 1987 190D 2.5Turbo 1987 190D 2.5-5SPEED!!!  1987 300TD 1987 300TD 1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!
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#3
10-09-2014, 11:55 AM
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Thanks VSTECH.
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#4
10-09-2014, 12:40 PM
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both DOT 3 and 4 work well.
replace every year (most important bit)
__________________
2012 BMW X5 (Beef + Granite suspension model) 1995 E300D - The original humming machine (consumed by Flood 2017) 2000 E320 - The evolution (consumed by flood 2017)
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#5
10-09-2014, 12:58 PM
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yup.
dry fluid with clean hoses is the most important part. even the best dot 5.1 fluid is worthless with water in there...
__________________
John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread "as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do! My drivers: 1987 190D 2.5Turbo 1987 190D 2.5Turbo 1987 190D 2.5-5SPEED!!! 1987 300TD 1987 300TD 1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!
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#6
10-09-2014, 01:29 PM
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I would look for the synthetic ones. Valvoline used to or does make one. I think Prestone does to. A bit better at no corroding. The local import part store carries Castrol or some other brands for Euro cars. Suppose to be synthetic. If DOT 5 is the silicon stuff, I would not use it. Good hi temp performance, but I have heard some problems with very low temps. So for a summer car it might be good. Although, I do have it in my Bricklin, and can not remember any problems.
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#7
10-09-2014, 01:32 PM
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all brake fluid is synthetic.
__________________
John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread "as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do! My drivers: 1987 190D 2.5Turbo 1987 190D 2.5Turbo 1987 190D 2.5-5SPEED!!! 1987 300TD 1987 300TD 1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!
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#8
10-09-2014, 02:40 PM
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Edit - I was wrong - it is DOT 4 - disregard this post.
__________________
1981 240 D in the Toronto Area Ivory with one black fender Last edited by Prospector; 10-09-2014 at 02:54 PM.
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#9
10-09-2014, 02:56 PM
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Dot5 is silicone fluid. Completely incompatible with dot3 fluid. If it has it in there it was installed after market. Not stock.
__________________
John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread "as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do! My drivers: 1987 190D 2.5Turbo 1987 190D 2.5Turbo 1987 190D 2.5-5SPEED!!! 1987 300TD 1987 300TD 1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!
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#10
10-09-2014, 04:30 PM
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Quote:
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#11
10-09-2014, 05:42 PM
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Quote:
I always tell customers when buying brake fluid that "synthetic" means nothing in regard to brake fluid. It's all synthetic. 3, 4, 5.1 are all glycol and 5 is Silicone not mixable with the others.
__________________
'84 190D 2.2 5MT (Red/Palomino) Current car. Love it! '85 190D 2.2 Auto *Cali* (Blue/Blue) *sold* http://badges.fuelly.com/images/sig-us/302601.png http://i959.photobucket.com/albums/a...0/sideview.png
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