[M2RAW]

Hello, My Castrol srf is going 1 year this nov and the car is my NOT daily, just occasionally canyons run. Did like 2 track days and I have one track day left this year. I'm curious if I should change it now it will be just fine 1 more track. My very first day track I did a lot of braking and second not that much. Anyone here have the same fluid that occasionally track their car?
Also, How do you know if you're brake fluid is going bad?
Thanks
OG M2

[medphysdave]

Originally Posted by M2RAW

Hello, My Castrol srf is going 1 year this nov and the car is my NOT daily, just occasionally canyons run. Did like 2 track days and I have one track day left this year. I'm curious if I should change it now it will be just fine 1 more track. My very first day track I did a lot of braking and second not that much. Anyone here have the same fluid that occasionally track their car?
Also, How do you know if you're brake fluid is going bad?
Thanks
OG M2

I'm at about 18mo with 3 track days on the car. You can have the water content of the fluid checked. I chose SRF because it's one of the most water resistant and has longer change intervals. I plan to change it at the 2yr mark, or I'll have it tested prior to my next track event if that happens sooner. Brakes performed perfectly at last track event.

[M2RAW]

Originally Posted by medphysdave

I'm at about 18mo with 3 track days on the car. You can have the water content of the fluid checked. I chose SRF because it's one of the most water resistant and has longer change intervals. I plan to change it at the 2yr mark, or I'll have it tested prior to my next track event if that happens sooner. Brakes performed perfectly at last track event.

How do you check it?

[Suds]

I get my SRF flushed every 12 months or less.
A good question is how fast of a track will you be on.

COTA is the fastest track I run where for me turn 1 is 135 to 40 and the back straight at 150 to 40 and I need the brakes to work. On slower tracks I wouldn’t be as worried.

Originally Posted by M2RAW

Hello, My Castrol srf is going 1 year this nov and the car is my NOT daily, just occasionally canyons run. Did like 2 track days and I have one track day left this year. I'm curious if I should change it now it will be just fine 1 more track. My very first day track I did a lot of braking and second not that much. Anyone here have the same fluid that occasionally track their car?
Also, How do you know if you're brake fluid is going bad?
Thanks
OG M2

[M2RAW]

Originally Posted by Suds

I get my SRF flushed every 12 months or less.
A good question is how fast of a track will you be on.

COTA is the fastest track I run where for me turn 1 is 135 to 40 and the back straight at 150 to 40 and I need the brakes to work. On slower tracks I wouldn’t be as worried.

Thunderhill east, ill say like 130 top speed

[swampfox94]

I talked to a few people from the last bmw cca event. They generally wanna see it changed every 6 months or 3 track weekends or else they won't pass pre track day track inspection for bmw cca.

[medphysdave]

Originally Posted by M2RAW

How do you check it?

I don't. The shop I take it to does. My guess is they take a sample and let it sit for a bit. Water should separate and a volume ratio could be calculated. Unsure what percentage water is considered the limit for replacement.

[3LiterBeater]

Originally Posted by medphysdave

I don't. The shop I take it to does. My guess is they take a sample and let it sit for a bit. Water should separate and a volume ratio could be calculated. Unsure what percentage water is considered the limit for replacement.

They have electronic testers that can supposedly read water content by measuring resistance between two prongs. I've seen brand new fluid come back as yellow (out of red/ yellow/ green) so I don't trust them entirely

[PackPride85]

Originally Posted by 3LiterBeater

They have electronic testers that can supposedly read water content by measuring resistance between two prongs. I've seen brand new fluid come back as yellow (out of red/ yellow/ green) so I don't trust them entirely

You can get manual test strips as well.

[5.M0NSTER]

Originally Posted by swampfox94

I talked to a few people from the last bmw cca event. They generally wanna see it changed every 6 months or 3 track weekends or else they won't pass pre track day track inspection for bmw cca.

That rule is for people running questionable fluids. Like no name brands, or even Brembo, or fluids requiring a change after a few months (like RBF). SRF is of different ilk.

The beauty of SRF is that WET boiling point is very close to DRY boiling point. I've use the same flush of SRF for 3 years in my M2, with multiple 'Ring and Spa track days.

Now in Camaro SS 1LE which reaches higher top speeds than my M2 did, and I just wrapped up year 2 and 8 track days on this fluid. I will change it before start of next season, but I just did Mid Ohio, which is a fast track with a few BIG brake zones, on hardly any thickness of the brake pads. No issues with fluid at all. SRF is solid for 2-3 year interval. Doing it annually with SRF is like changing you BWM LL oil every 3000 miles.

[DRLane]

Originally Posted by 5.M0NSTER

That rule is for people running questionable fluids. Like no name brands, or even Brembo, or fluids requiring a change after a few months (like RBF). SRF is of different ilk.

The beauty of SRF is that WET boiling point is very close to DRY boiling point. I've use the same flush of SRF for 3 years in my M2, with multiple 'Ring and Spa track days.

Now in Camaro SS 1LE which reaches higher top speeds than my M2 did, and I just wrapped up year 2 and 8 track days on this fluid. I will change it before start of next season, but I just did Mid Ohio, which is a fast track with a few BIG brake zones, on hardly any thickness of the brake pads. No issues with fluid at all. SRF is solid for 2-3 year interval. Doing it annually with SRF is like changing you BWM LL oil every 3000 miles.

SRF is explicitly 18 months. It's pretty cheap, why you wouldn't change it according to their spec?

[5.M0NSTER]

Originally Posted by DRLane

SRF is explicitly 18 months. It's pretty cheap, why you wouldn't change it according to their spec?

Because it works?

Even when saturated with moisture it’s wet boiling point is way better than the competition.

I did sub 8min Nordschleife laps on it during year 3. Plus in every hard braking situation I put it in, it delivered. So why would I change it earlier?

[///393]

“an abundance of caution”
idiom: mainly US

The fact that someone is being extremely careful to avoid a particular risk, even if the risk is small:

E.g - “The airline said that out of an abundance of caution they would temporarily ground their entire fleet of planes.”

SRF may have worked in your extended use case scenario without repercussions but given the risk some choose to change SRF on shorter intervals. To each their own. Ain’t gotta smoke my brand cigarettes to be cool. Running sub 8 ring laps is cool.

[PackPride85]

I use RBF 600 and change it at the beginning of the track season. Never had any issues. It does get pretty dark at the year mark though.

[M2RAW]

Originally Posted by wilson kop

“an abundance of caution”
idiom: mainly US

The fact that someone is being extremely careful to avoid a particular risk, even if the risk is small:

E.g - “The airline said that out of an abundance of caution they would temporarily ground their entire fleet of planes.”

SRF may have worked in your extended use case scenario without repercussions but given the risk some choose to change SRF on shorter intervals. To each their own. Ain’t gotta smoke my brand cigarettes to be cool. Running sub 8 ring laps is cool.

I don't understand what you saying or on but ty lmao

[///393]

Originally Posted by M2RAW

I don't understand what you saying or on but ty lmao

Responding to the post directly above. Also, drugs.

[M2RAW]

Originally Posted by wilson kop

Responding to the post directly above. Also, drugs.

Hop off that

[///393]

Na