scott40

It's a way off I know, but for next Spring's track prep, what should I do brake fluid-wise for the RS? The car will have break in miles by then. Car has PCCB. I don't know what Porsche puts in OE. What is recommended? Motul? Castrol SRF?

beentherebaby

Everyone has their favorite brake fluid... Motul RBF 600 is very popular as is Castrol SRF. Some folks find the increased time interval between bleeding on the SRF a cost effective measure while some prefer to bleed the lower cost RBF 600 before each track event. Either approach seems to work just fine.

GrantG

I've been using Endless RF650 which is factory-fill for the GT3 racecars.

https://rennlist.com/forums/997-gt2-...id-review.html

wapita

i've been using Endless RF-650. Costs slightly more than motul, but still quite a bit less srf still

Bob Rouleau

Motul RBF 660

Carrera GT

What's the status on the Castrol synthetic and Motul red?
Last I heard from Porsche, neither was approved -- the Castrol is too corrosive and the Motul causes seal failure.
Endless is something I have tried.
http://www.endless-brake.info/e_layer_product.htm
Strange that their Web site uses the image of a brake coming to its end.

I flush with ATE alternating blue/yellow once a year, I never have to bleed and have zero trouble with the pedal.

serickson

Has anyone ever placed a non-reversing temperature label on the calipers to measure the maximum temperature? Mcmaster Carr has 9/16" diameter labels that has 5 temperature points. I am thinking of getting 340f-380f (9246T23) and 390f-435f (9246T25). I am thinking this way you can determine your caliper temperatures and give you a better idea about the brake fluid needed. Any thoughts?

beentherebaby

Temp indicators take all the guesswork out of it... Those temp ranges should be good.

Land Jet

My tech has been using SRF in track Porsches for years and says he never saw any problems with it. He says that is an urban myth. I have used SRF in my heavier turbo for 3 years now. Even though I track it, I never had to bleed it or give it a second thought. Never had any brake problems either.

Carrera GT

If there's an urban myth, it's that it's an urban myth. The same "I've been doing this for years" observation comes up every time. Me too -- I've been around people running Motul red for two decades, but that all adds up to an insignificant sample size. Porsche sees every reported case and that has to be the largest sample size. If someone has the resources to dig up the TSB, it's been an issue since the 996.1 but I'm always curious to see if there's been any recent updates.

Also, given that ATE works, I see no merit in the expensive 600F stuff.

As for temp tags, the only thing would be to get advice from a brake oem to determine where to put the tags to get indicative temps.

The only "trick" I can suggest for better brake performance from the piston/fluis side, is a Titanium insulation plate slotted in behind the pad backing plate once the pad is down 10-20% wear (it often won't fit in behind a fresh pad) but this won't help the rotor heat soak that would jeopardize the CCBs.

savyboy

Had SRF in my RS since May, approx 23 track days. No bleeding. No problems.

scott40

I ran ATE superblue in my TT which had GT3 brakes. Tracked it pretty hard and no issues. Maybe I should not rock the boat and just stick with it. I just seem to remember guys knocking it, claiming it was no better than OEM/street fluid.

mooty

impressive.
i am chicken little. i bleed often.

obsessedone

I've tried most of them, finally went to Castrol SRF despite the high cost and I am sticking with it. Costs more but I am not getting constant soft peddle and don't need to bleed every event like I did with other fluids.

Not sure I can quite say you'll save the cost with less bleeding if DIY (like I do), but you sure will if you're paying someone to bleed for you.

bgiere

Why not just use the cup car factory fill? it's less expensive and easy to find. Endless RF650