nbrown69

I had a massive improvement in brake feel and consistency through a two day DE event when my tech suggested I switch Castrol SRF React Fluid. It was a great suggestion. Good luck!

AudiOn19s

I'm surprised more people haven't jumped on board with Endless. Best pedal feel I've ever had, extended bleed intervals compared to other "race" fluids.

I'm pretty certain this is the fluid that comes in all cup cars 997.2 to present.

aznkuja328

same here - great pedal feeling. i have used srf for longer than 2 years, and then switched to rf650. so far the feeling is comparable, but i have heard that they will last longer. with motul rbf600, i had to change the fluid every 6 months, srf was about 9 months, and i hope the rf650 will last longer. although the boiling points on the rf650 isn't as high as srf, but i have noticed that srf absorbs water sooner than the endless.

KA MOTORSPORT

The 991 Cup comes with the PFC fluid as with all the other components in the brake system (calipers, pads, discs, etc...). The 997 came with Endless fluid.

We use Brembo HTC64 now as FIA GT3 platforms are now supplied with that fluid as spec. We have used Endless and the Brembo HTC is very similar in performance.

The Brembo has slightly better pedal feel due to the lower compressibility of the fluid from our driver feedback. It is also slightly cheaper and much more readily available.

Not sure about the OEM GT3 fluid.

Superman32

I use endless and project mu brake fluid. Very good feeling and don't need change as often as srf. Project Mu fluid will change colour to clear when need to change.

fester

Endless is what cup cars use but the whole flush and replacement job is about $600 at Porsche dealership workshops. If I’m going to use anything beyond what comes from factory recommended, I’d use Endless.

RDCR

I know this is an old thread but I wanted to mention the only time I've had a soft pedal on a Porsche on track was in a Cayman R with OEM fluid. Switching to Endless solved that problem. I've been an endless guy since.

mdrums

To me Castrol SRF pedal feel is too mushy. I prefer the pedal feel of either Motul 660 or Endless. Also the stock brake fluid in GT cars IS NOT Castrol SRF

Perimeter

Could it possibly be ATE 2000 with an OEM label?

Keadog

I found this as I'm coming up on the 2 year mark and looking to do a brake fluid flush this Spring before switching to my 991.2 C4 cab (with the smaller black caliper brakes) as a DD.
Does using a higher boiling temp fluid negatively impact daily street driving in any way? Any downsides to using something like Endless in a 99.999% street car? Other than cost, which as pointed out above it minimal compared to tires and brakes.
Thanks.

GrantG

There really is no benefit to use racing fluid for a street driven car and it may slightly shorten the change intervals (though I have used Endless on a Daily Driver for well over 2 years without issue). If you are going to change fluid annually, then Endless is a great choice. If you are going to change fluid every 2 years, then it's still probably a great choice (though it's probably recommended in a track car to be changed more frequently than that). It will not have any downside to the street driving - just don't leave it in the system forever without following 2 year change schedule for the car.

Keadog

Thanks for the response. I wouldn't go over two years but only drive the car about 3500 miles per year and have yet to do a DE event (where I happily reside in the slowest or second slowest group). We try to take a couple road trips in it every year (pre/post COVID), so a lot of the miles are highway.
It looks like I would need to buy 3 500 ml cans to insure a complete flush. Correct? And, is it really clear in color?

GrantG

I think 3 cans should do it. It's fairly clear, but not like water - it has a slightly tinted appearance.

Keadog

Thanks!

flyjets

Motul 660 is my choice.2 Can's

Ian