5.1 and 4 brake fluid

[Daniel306]

Is it ok to use 5.1 brake fluid? the cap dose say dot 4 only tho

[Dum-Dum]

IIRC only if you have the whole system bled through with 5.1, you cant use a mixture of them.

I usually use 5.1 when i bleed brakes on a 306.

[Connor]

You can use what you like, but just don't mix different dots together, 3 and 4 can mix, but anything else is a big no no

[Toms306]

Why can't you mix them?

I was told that if it needs DOT 4, then anything DOT 4 and above would be fine....as it'll just have a higher boiling point.

[Connor]

Because they can react to each other... Should have been thought that at college

[Toms306]

Because they can react to each other... Should have been thought that at college

Ah didn't know that, cheers. What happens if they do react? Air bubbles I guess?

BTW, you'd be surprised what we aren't taught in college! hock:

[Connor]

Well its like water and oil, they don't mix... same thing for brake fluid, dot4 is a different liquid to dot5.1

[Toms306]

Oh, fair enough.

[Connor]

And I wouldn't be surprised at what they don't teach you, any time we had to go into the workshop at college, we always had to fix all the full time students f*ck ups...

[Dum-Dum]

Isnt it something to do with semi synthetic and fully synthetic or am i going nuts again?

[Toms306]

And I wouldn't be surprised at what they don't teach you, any time we had to go into the workshop at college, we always had to fix all the full time students f*ck ups...

Lol, we spend a lot of the time fixing the school kids/level 1's muck ups (whats up with the swear filter!?).......they treat the cars there like shit tbh, wouldn't wanna let them loose near my car!!