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THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHBleeding brakes from Castrol SRF to Motul
Leading reported evidence
Run millers in the 968
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I ran Millers in the 968 when I tracked it, and had put in SRF in my race car, but will be changing it over, as well, based on the fact that the Bryan Herta team has tested the Millers, and will be using it in their IndyCars, as well.
Leading evidence: 'Run millers in the 968' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Replace srf' (1 discussions). For that action, 0 discussions report a resolution and 0 report an unsuccessful attempt. No action has an explicit, attributable resolution report under the current rules. These are forum reports and suggestions, not a confirmed diagnosis.
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I ran Millers in the 968 when I tracked it, and had put in SRF in my race car, but will be changing it over, as well, based on the fact that the Bryan Herta team has tested the Millers, and will be using it in their IndyCars, as well.
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Suggestion
IMO SRF is way over kill I highly doubt any of us can heat the brakes that hot unless you are running an endurance race and drive like an Andretti.
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Performed · outcome unconfirmed
I ran Millers in the 968 when I tracked it, and had put in SRF in my race car, but will be changing it over, as well, based on the fact that the Bryan Herta team has tested the Millers, and will be using it in their IndyCars, as well.
Discussions that performed work without a confirmed outcome
1
0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.
0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.
Performed · outcome unconfirmed
I ran Millers in the 968 when I tracked it, and had put in SRF in my race car, but will be changing it over, as well, based on the fact that the Bryan Herta team has tested the Millers, and will be using it in their IndyCars, as well.
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17 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
Rennlist: 1 discussions
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Generation: 20261027T022239Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
Ok, I have Castrol SRF fluid in my car. I am happy with it, but too expensive I want to try cheap stuff so that I can bleed more often.
But
There is a big disclaimer saying not to mix Castrol SRF with other brake fluid, so what kind of precaution should I take when inserting the new Motul fluid in there ?
They undoubtably will mix a bit at some point...
Anything to worry about ? or not to worry ?
I think they are just covering their aZZ
normally I remove as much fluid as I can out of the master cylinder with a little syringe from the pharmacy (free)
then push about a Qt through the lines...that's plenty - just eyeball each one to be about a 3/4 cup - that saves you enough to end up with the reservoir full
I think the reason for that warning is because if you mix other compatible brake fluid with SRF, it will lower the dry/wet boiling points of SRF. For flushing, I don't see a problem.
As other have said suck out as much out of the master cylinder then bleed to flush out. IMO SRF is way over kill I highly doubt any of us can heat the brakes that hot unless you are running an endurance race and drive like an Andretti. You ared way better off using something cheaper and bleed more often as brake fluid is hydrophillic. The moisture can abosorb in the brake fluid in as short as a year causing earlier boiling point. Motoul has a very high boiling point and is so much cheaper.
actually a less experienced driver can often put more heat into brakes than an experienced one
and at the wrong times
I also wonder about all these brake bleedings...I track pretty heavily and rarely bleed...and have had zero issues - I see people bleeding between runs and think...well, good idea I guess?
I am a newbie and I bet I more than I should overheat the fluid and I'd prefer being able to bleed it a little more often.
I have been very happy with the SRF, since I have it, my pedal is very progressive and no more mush.
Just the price per bottle is nuts...
I might put SRF again but man that is expensive.
I wanted to try the motul to see if that made really a difference for me or not.
That seems pretty reasonable but we are required to do so more often here in the Carolina's even for DE's. And as I said, SRF is the exception. As a newbie, there are too many other things to worry about besides your brakes.
Philooo, if you are new and worried about cooking the brakes, then by all means stay with SRF and bleed an ounce or two as required. But with track pads to help insulate the piston, I bet you are fine.
I believe newbies don't go fast enough to boil over and usually DE ared short run less than 25 minutes. However it does not matter if its SRF or ATE they all absorb moisture at similar rates. SRF just has a higher wet boiling point. Either way almost every one gets by using Blue or motoul which is a 1/4 of the cost of srf so I rather bleed more often just to be on the safe side.
Jetskied, learn me up here. I thought the whole point of SRF was that it was totally non hydroscopic (spelling?) and that is why it is good for a year at the track without a flush.
We had a customer inquire about this yesterday. The Millers we sell is basically the same stuff as the Motul - neither one makes it, it is sourced externally (also also sold as Stop Tech et al). I ran Millers in the 968 when I tracked it, and had put in SRF in my race car, but will be changing it over, as well, based on the fact that the Bryan Herta team has tested the Millers, and will be using it in their IndyCars, as well.
Here is a link to the TDS on SRF from Castrol:
http://datasheets.bp.com/bpglis/Fusi...E-8DHDD7_0.pdf
Key phrase in there is: "It is miscible with all conventional fluids meeting US Federal Standards FMVSS 116 DOT 3 and DOT 4, ISO 4925 and current SAE J 1703 and J1704."
Based on that, a simple flush is probably adequate. I have my personal tendencies of completely draining a system, and blowing out the lines, but I don't have ABS, so it may be easier said than done for all of you.
This is a source reference. Confirm exact model applicability in the original material.
