Has any of you guys used this? I recently bought 2 bottles and plan to bleed my old brake DOT 3/4 out and put in the Motul DOT 5.1. My question is... once i put in the Motul 5.1, is it possibly to use lower DOT 3/4 ever again? Or ever mix them? From what I've researched, it looks like i can mix DOT 3, 4 , or 5.1 together in theory because they contain Poly glycol. But I also read not to mix types or brands together either. What do you guys think? Thanx

 

Yes you can mix. Dot 3, Dot 4, and Dot 5.1 are compatible with each other. The only thing you want to avoid mixing is silicone based stuff which is DOT 5.0 (it doesn't absorb moisture).

I like motul...good stuff!

 

whast the difference with brake fluids... why is one better than the other

 

DOT 5.1 has a higher dry/wet boiling point than typical DOT 3 or 4. Basically the fluid can handle hard braking without giving up braking quality. Typically used for upgraded brakes like slotted rotors or performance pads and/or steel braided brake lines.

 

did you get ss lines? goodridge? neuspeed? =P

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by RotaryBzzzz &raquo;</TD></TR><TR><TD CLASS="quote">Yes you can mix. Dot 3, Dot 4, and Dot 5.1 are compatible with each other. The only thing you want to avoid mixing is silicone based stuff which is DOT 5.0 (it doesn't absorb moisture).

I like motul...good stuff!</TD></TR></TABLE>

no dude, you can step up from dot3 to dot4 but if you going from 4 to 3, you might have your brake fiuld overheated and your brake not work at all.

dot 5 is silicone based, just like you said(good knowledge) and dot 3-4 is oil based(crude oil product)

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by accordm3 &raquo;</TD></TR><TR><TD CLASS="quote">whast the difference with brake fluids... why is one better than the other</TD></TR></TABLE>

not better, i just the different grade of the fluid, one is not better than the other, it's what is design to used in your car.

dot3=most common
dot4="upgrade" version of dot3 with a higher boiling point
dot5=redesign version with silicone base instead of oil based fluid

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by iam7head &raquo;</TD></TR><TR><TD CLASS="quote">

not better, i just the different grade of the fluid, one is not better than the other, it's what is design to used in your car.

dot3=most common
dot4="upgrade" version of dot3 with a higher boiling point
dot5=redesign version with silicone base instead of oil based fluid</TD></TR></TABLE>

Don't forget about DOT 5.1 which has even a higher wet/dry boiling point than DOT 4 and 3. Which is still poly glycol based and could be used in normal vehicles.

Silicone based stuff on the other hand like DOT 5.0 is used more in military vehicles if i read correctly and doesnt absorb moisture well.

 

5.1=too new for my ASE cert. manual

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by iam7head &raquo;</TD></TR><TR><TD CLASS="quote">

no dude, you can step up from dot3 to dot4 but if you going from 4 to 3, you might have your brake fiuld overheated and your brake not work at all.

dot 5 is silicone based, just like you said(good knowledge) and dot 3-4 is oil based(crude oil product)</TD></TR></TABLE>

True. But more or less it's safe to mix 3/4/5.1. They are chemically similar.

 

lowering boiling point of the brake fluid is not recommended in oem honda shop manual, all data systerm, mitchell on demand nor ase certified manual

just remember 3-4=okay
4-3 = let's wish you have a strong leg

 

oh yeah, one more note before you kill your abs box

you CANNOT use dot 5(dont know about 5.1) in abs equipped car, it will kill the abs system.

it happen when it first dot5 came out, the police department put dot 5 in their ford thinking it's safe to use dot 5 on dot 4 equipped abs car, couple months later, there's no brakes on them

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 2+2=5 &raquo;</TD></TR><TR><TD CLASS="quote">oh yeah, one more note before you kill your abs box

you CANNOT use dot 5(dont know about 5.1) in abs equipped car, it will kill the abs system.

it happen when it first dot5 came out, the police department put dot 5 in their ford thinking it's safe to use dot 5 on dot 4 equipped abs car, couple months later, there's no brakes on them </TD></TR></TABLE>

Yea DOT 5.0 is silcone based that doesn't absorb water. While DOT 5.1 is poly glycol based like DOT 3 and 4. I have researched it all into detail

 

my question remains, is it safe for abs equiped car?

i know for sure 5.0 is not

dot5 is mostly used in boat trailer, doombuggie, etc

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 2+2=5 &raquo;</TD></TR><TR><TD CLASS="quote">my question remains, is it safe for abs equiped car?

i know for sure 5.0 is not

dot5 is mostly used in boat trailer, doombuggie, etc</TD></TR></TABLE>

I took a look at my Motul DOT 5.1 brake fluid. It says it works great with ABS systems.
Sidenote: I'm doing my rear disk brake conversion tomorrow with some SS lines and aem brake pads and some brembo blanks and bleeding all my old fluid out for the motul DOT 5.1. I'll keep you guys updated with some pics

 

very very exciting news indeed, so they got around with the abs issue.

keep us updated and perhaps take some picture for the rear disk swap!