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General TR Dot 4 Brake Fluid

KVH

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I just read a long series of comments/a blog about synthetic Dot 4. A number of folks say you can’t use that Dot 4 without first replacing wheel cylinder and master cylinder seals with non-rubber composition, and even then I should expect to be addressing leaks. What? Really? Why bother? Shouldn't we just hunt down a non-synthetic Dot 4 if it exists and can be found.
 

TR3driver

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LarryK

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Used to be DOT 3 was used in the US domestic cars for the use of neoprene seals in brake systems. DOT 4 was used in European cars because of rubber seals. I don't think it matters anymore. I have always used the Castrol DOT 4 for everything. Bought a newer Rover and it says use synthetic DOT 4 and showed a black Castrol bottle. Went up to Ford dealer and asked for a bottle of synthetic DOT 4 as Raptor systems are close. Parts guy said they don't use synthetic. So I ordered in new bottles of Castrol. Then I looked at one of my old white bottles and it too said synthetic. Well, went to Advance Auto and there was Firestone synthetic DOT 4. DOT 4 has a higher heat tolerance and moisture control. For racing the Ford truck brake fluid has a really good heat tolerance.
 
OP
KVH

KVH

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Yes I’m good with Dot 4 as well. I was reading too many disparate complaints, stories and woes about isolated experiences and a lot of confusion between synthetic and silicone. MOSS has a good article in the subject.

Gosh, I’ve been absorbed in other matters and it’s sinking in that Blaine Graham retired. I’d been learning from him for a long time. And from many more here, and you know who you are. Keep driving TRs.
 

martx-5

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You mean the earth ain't flat??
 

TR3driver

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You mean the earth ain't flat??
At the risk of sounding like a former president, that depends entirely on what definition of "flat" you use.

Merriam-Webster gives
cJIqBHS.jpg


and

SUc0e24.jpg


So by those definitions, the earth is pretty near flat!
:^)
 

sp53

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It is flat; how else are you going to have horizontal? Do you think everything will return at the finest infinitesimal angle from infinity to go full circle?
 
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