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Questions tagged [dot4]

Referring to automotive brake fluid. It has a dry boiling point of 230 °C (446 °F) and a wet boiling point of 155 °C (311 °F)

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1 answer

Why don't car brake systems generally use mineral oil as brake fluid?

Most cars use DOT brake fluid, which is hygroscopic. By absorbing moisture, it needs to be periodically changed, typically every 2 years. Thus, for example for a 20 year service life the brake fluid ...
juhist's user avatar
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3 votes
1 answer

Can I put DOT 4 brake fluid into DOT 3 brake?

It's a 16 Tahoe. In my owner's manual and the brake fluid reservoir cap , they say only use DOT3 brake fluid. I'm wondering if I could use DOT4 or DOT4 Low Viscosity brake fluid?
MultiCore's user avatar
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1 answer

Recommended brake fluid type for 2012 Ford Focus

My 2012 Ford Focus manual says to use DOT3 brake fluid, but the cap on the brake fluid reservoir says only use DOT4. Which one do I use?
tracy's user avatar
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2 votes
1 answer

Is it ok to mix different clutch fluid color?

Needed to top up my clutch fluid. Is it ok to mix different clutch fluid color? One I currently have on the reservoir is blue. I will try to look for blue but what if I cannot find one. I really need ...
110100100's user avatar
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2 votes
3 answers

2005 Montero LTD — Brake Warning Light - Intermittent

Brake light just started showing up on the dashboard. First item I will be checking is the Master Fluid Level . . . the manual says DOT3 or DOT4 brake fluid . . . How do I determine which one is ...
05MonteroLTD's user avatar
8 votes
3 answers

What is the difference between DOT4 and DOT5 brake fluid?

I've been going to a lot of muscle car websites the last few days and have seen quite a few recommendations to switch over a brake system from DOT4 to DOT5. The work that's required seems to revolve ...
DucatiKiller's user avatar
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11 votes
5 answers

Mixing DOT 4 with DOT 4 synthetic

I couldn't see an existing question about this but please link to it if you know of one ... I should point out I'm English and the products described are bought in the UK, in case it makes a ...
user2808054's user avatar
10 votes
3 answers

Using DOT4+ in clutch/brakes when DOT3 is recommended?

Looking at Wikipedia's DOT 3 page, it looks like it's been effectively superseded by DOT 4 fluid, but it's still sold and is still recommended on many forums. This question has an answer saying DOT 4 ...
wjl's user avatar
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42 votes
7 answers

what is the difference between DOT3 and DOT4 brake fluids?

What is the difference between DOT3 and DOT4 brake fluids? What could possibly go wrong if I use a (4 times cheaper) DOT3 brake fluid instead of the DOT4 which manufacturer recommends (but allows ...
ria's user avatar
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