One of the distinction of Endless RF-650 brake fluid is the low compressibility, thus providing a harder brake pedal feel than other brake fluids. That is why Porsche uses it for their GT cars. My question is for those that use the regular fluid and then change to Endless RF-650, do you notice a distinct difference in providing harder brake pedal ? Or is it just a placebo effect ?

 

What DOT rating is that fluid. I don't understand how this fluid could have less compressability than say a Motul RBF 600 and even if it does, how it could be enough to actually feel a difference. The whole premise on which brake systems function is that the fluid isn't compressible. You. Push on the brake pedal and the force of the piston in the. Master cylinder r transits that force to the caliper pistons and pads forcing them against the rotor. If brake fluid was really compressible thee would be a major delay in braking engagement. Rubber lines can expand a bit upon pressure application which is why Teflon lined braided stainless are better, but I would strongly doubt you'd feel a difference with brake fluid.

If that fluid is a DOT 5.1, don't even think about it as the brake system needs to be virgin clean (like brand new) to use that silicone based fluid, and you won't get an existing brake system clean enough to not have cross-contamination and ruin the complete system.

 

I thought 5.0 was the bad stuff and 5.1 was just a higher boiling point 3 or 4
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Yep, you're totally right. I didn't realize there were two designations of Dot 5, a 5 and a 5.1. It's the 5 you don't want to switch to.

 

https://thebuildjournal.com/tech-gui...view-analysis/

It is also factory brake fluid for Porsche GT cars.

 

You could fill the system with pee and it would have the same compressability as the most expensive brake fluid.

Is that company making the claim that their fluid compresses less than other brands, or are they saying that theirs boils at a higher temperature so your pedal won't go soft as quickly on the track?

 

From the article, it looks to me like it's the latter, that it doesn't boil as early. In their Tier 2 fluid summary, anyone who is boiling Motul RBF600 isn't driving and braking properly. They'd be better off spending more time with an instructor to learn how to carry speed than testing various fluids.

 

Probably no difference. I've tried all sorts of high temp fluid because that was what was available at the time I needed it. They all worked fine on the track meaning, I had no concerns. I typically use SRF. If you are looking at high temp fluid, just buy it and try it. If you are on the street and a multi-year freq changer, don't wast your money.

 

I'm placing the same thread over at the GT forum. Since the GT cars come with this brake fluid and see what the owners say about it.

 

Endless is good stuff. So is SRF.

Endless has a lower dry and higher wet boiling point than SRF so it effectively lasts longer but fresh SRF does offer a higher boiling temp.

I’ve used both and never had an issue when the fluid is reasonably fresh.

 

If you track, you will notice the pedal firmness from Endless to SRF and other brands. Just to clarify, the street GT cars don't come with Endless. Many of the race teams that support Cup cars do use Endless, however, certain spec series like Pirelli Trophy must use the spec brake fluid which is PFC. Also, Team Corvette used to use Endless brake fluid for their AP Racing brake systems.

 

Have been using this in all of our Porsche track and race cars for years. Highest dry boiling point, low aeration during manufacturing (made in USA), and typically 2/3 of the cost of SRF.
Has a lower wet boiling point than SRF, but who cares if you're maintaining it often (as you should).