Break Fluid: DOT3 or DOT4
Thread Starter
Rookie
Joined: Oct 2020
Posts: 58
Likes: 6
From: BR
Break Fluid: DOT3 or DOT4
Well, I searched here and didn't find any discussion about brake fluids.
The rx350 manual says to use DOT3... but it's getting harder and harder to find. I read that using DOT4 can corrode the master cylinder, which is why Toyota insists on DOT3.
What is your experience?
The rx350 manual says to use DOT3... but it's getting harder and harder to find. I read that using DOT4 can corrode the master cylinder, which is why Toyota insists on DOT3.
What is your experience?
Intermediate
Joined: Apr 2018
Posts: 438
Likes: 189
From: MA
I didn't know Dot 3 was getting scarce.
As far as I know, Dot 4 is perfectly acceptable where Dot 3 is recommended, but "the internet" says not to mix the two.
I still have plenty of Toytota Dot 3, so I haven't bought any brake fluid in a while.
As far as I know, Dot 4 is perfectly acceptable where Dot 3 is recommended, but "the internet" says not to mix the two.
I still have plenty of Toytota Dot 3, so I haven't bought any brake fluid in a while.
Pole Position
Joined: Dec 2019
Posts: 2,993
Likes: 608
From: The Jet City
Dot 3 is very popular vs dot 4. Main thing about dot 3 is it'll absorb less water then dot4, but dot 4 has higher boiling points. How many ppl flush the brake fluid? That's where a dot 3 comes in.
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