Brake Fluid

[ak_stylez]

Hey people,

Installing some new slotted rotors + pads tomorrow so I'm gonna get my brake fluid flushed and refilled while i'm at it. The reserve says to use only DOT 3 fluid. So is it not safe to use DOT 4 or 5.1 which are supposedly better?

[Slim Mat]

I think higher is ok.

[djr81]

Use dot 4 fluid.

[skybarge]

Just use Dot 4 cheaper and works

[/2on]

Yeah just use a dot 4 or a super dot 4 one and you will be fine

[adam-__-]

Yeah, just use DOT4 should be alright. A higher 'DOT' means that it can take more heat? Is this right or?

[BHDave]

pretty much. usually means it needs to be changed more often as well as it soaks up moisture quicker

[MANWHORE]

pretty much. usually means it needs to be changed more often as well as it soaks up moisture quicker

Yeah, definitely. When I first got my skyline, I used motul dot 5.1. After a while, I was like why bother - needs to be changed more frequently even though it only costs $1 more than dot 4.1.

I'm not too worried about the cost, since they're only around 10-13$ a bottle for motul dot 5.1, its just the hassle of changing it.

I've never boiled super dot 4, even on the track, so its good enough for me

[ak_stylez]

hey thanks for all the replies... unfortunately didn't read them all in time

I ended up using some DOT 3 penrite with a dry boiling point of 275 degrees celcius. Pretty damn high if you ask me considering the dot standards..

Dry Boiling Point Wet Boiling Point

DOT 3 205°C (401°F) 140°C (284°F)

DOT 4 230°C (446°F) 155°C (311°F)

DOT 5 260°C (500°F) 180°C (356°F)

DOT 5.1 270°C (518°F) 191°C (375°F)

[BHDave]

Sounds good. The reason that it is still dot 3 is it likely fails on the higher dots on the wet boiling point, so make sure you change it regularly!

[djr81]

hey thanks for all the replies... unfortunately didn't read them all in time

I ended up using some DOT 3 penrite with a dry boiling point of 275 degrees celcius. Pretty damn high if you ask me considering the dot standards..

Dry Boiling Point Wet Boiling Point

DOT 3 205°C (401°F) 140°C (284°F)

DOT 4 230°C (446°F) 155°C (311°F)

DOT 5 260°C (500°F) 180°C (356°F)

DOT 5.1 270°C (518°F) 191°C (375°F)

And the winner is the 600 degree fahrenheit boiling point dot 4-600 fluid you can get from your friendly local Motul distributor for $25 a bottle. Motul RBF 600. At worst it will degrade to be the same as normal dot 4 fluid.

[Jax]

And the winner is the 600 degree fahrenheit boiling point dot 4-600 fluid you can get from your friendly local Motul distributor for $25 a bottle. Motul RBF 600. At worst it will degrade to be the same as normal dot 4 fluid.

True, but it's not only the boiling point. As fluid absorbs moisture, it becomes more and more corrosive. So you need to change it regularly for that reason, even if braking performance is OK. Corroded/leaking cylinders, etc., more expensive than fluid changes.

[R TUNE]

hi mate.

im putting r33 gtst front brakes on my r31 and i have sloted disc rear.

im about to put motul 5.1 in, which im going up from castorl super dot4. just because i go to track days and the like and

im userly brakeing hard so i need high temp fluid.

i would say go as high as you can.