[Cobra427]

Looking for a link to some good high temp brake fluid for out cars. No point of me installing better pads and rotors if I’m just going to cook the fluid anyway. I would prefer a recommendation based on somebody’s prior use. Thanks again.

 

[FunktasticLucky]

The only compatible fluid is going to be DOT 5.1. Not to be confused with DOT 5 which is NOT to be used in our DOT 4 vehicles. The fluids are not compatible.

Sent from my VS996 using Tapatalk

 

[DaMiFo]

Did they change the fluid spec on the newer Fusions/MKZ's? My '17 requires DOT 4 LV fluid. Although DOT 5.1 is compatible as a replacement for the older specs and will have a slightly better boiling point. (As FunktasticLucky said, not DOT 5, only 5.1)

 

[Cobra427]

So only option is DOT 5.1?
Our cars use DOT 4?
And don't use DOT 5?

 

[ArthurUSCG]

So only option is DOT 5.1?
Our cars use DOT 4?
And don't use DOT 5?

We use Dot 4 LV nothing else is compatible from what I can tell.

Sent from my Pixel 4 XL using Tapatalk

 

[FunktasticLucky]

5.1 is compatible. It's propylene glycol like DOT4 is. But I don't know how much a difference you need. We are talking like 20-25C difference.

Sent from my VS996 using Tapatalk

 

[Cobra427]

5.1 is compatible. It's propylene glycol like DOT4 is. But I don't know how much a difference you need. We are talking like 20-25C difference.

Sent from my VS996 using Tapatalk

Honestly what it comes down to is any little bit helps

 

[ArthurUSCG]

5.1 is compatible. It's propylene glycol like DOT4 is. But I don't know how much a difference you need. We are talking like 20-25C difference.

Sent from my VS996 using Tapatalk

But it last I looked all Dot 5.1 didn't meet the specs for viscosity stability that dot 4 LV requires. The abs system is also tuned for the thinner viscosity.

Also unless your using high temp race pads the higher temp brake fluid is pointless. Usually to get to where you need high temp brake fluid, most street pads would be far outside of the temp range and the over heated pads would be why the brakes would turn to mush.

Get dot 4 LV fluid and do yearly flushes to get it closer to the dry boiling point.

Sent from my Pixel 4 XL using Tapatalk

 

[FunktasticLucky]

The LV is only for low temps though. I'll ldo some research later and see if I can find the viscosity ratings for all the breaker fluid.

Sent from my VS996 using Tapatalk

 

[Cobra427]

Would this be okay to use?

 

[DaMiFo]

No, regular DOT4 it's going to be more viscous than 4 LV.

Lower viscosity is OK, but a higher viscosity may negatively affect ABS performance & overall brake feel.

Sent from my SM-G986U using Tapatalk

 

[FunktasticLucky]

It looks as if 5.1 has a similar viscosity to 4 lv. Ford makes a 5.1 fluid but their sds documents don't list the viscosity of it

Sent from my VS996 using Tapatalk

 

[Vidmo]

I've been reading up on this topic for a while after boiling the Motorcraft PM-20 on a short track stint with EBC Red pads (not even Yellow or Blue). From my research (and said above) you could probably get away with just about any DOT 5.1 fluid as the viscosity is close to but not quite the same as DOT 4 LV.

FYI This site is a great resource on Brake Fluids:
Brake Fluid Comparison Shopping (lelandwest.com)

Here are my final choices that should work well in our cars and be a bit better than the stock PM-20.

	MPN	Dry boiling point	Wet boiling point	Viscosity at -40°C (-40°F)
Motorcraft DOT 4 LV High-Performance Brake Fluid	PM-20	509° F/265° C	338° F/170° C	750 mm²/s
Bosch ESI6-32N Brake Fluid	ESI6-32N	520° F/271° C	360° F/182° C	685 mm²/s
ATE Super DOT 5.1	706602	509° F/265° C	356° F/180° C	750 mm²/s
AMSOil DOT 3 and DOT 4 Synthetic	BFLVCN-EA	520° F/271° C	368° F/187° C	817 mm²/s
Motul DOT 5.1 Low Viscosity Brake Fluid	100951	522° F/272° C	365° F/185° C	820 mm²/s
TBM DOT 5.1 Extreme 6 Brake Fluid	7-0102	612° F/322° C	400° F/204° C	900 mm²/s
P.MU Racing BF6 DOT5.1 ISO:Class6		521° F/272° C	359° F/182° C	900 mm²/s
Champion DOT 5.1 Brake Fluid	4056K/12	530° F/276° C	356° F/180° C	900 mm²/s