Cooked my brake fluid!!! - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

markitect · 06-25-2013, 04:21 PM

I ran my second HPDE this weekend, the car is over a year old, and my stock brake fluid rapidly degraded. It had no noticeable change after the first track day last year, but the result this time were this:

I didn't notice any color change until after the last session, when I noticed I had spongy brakes at the end of the last session(clearly boiled some fluid), and then the color changed significantly.

I find it odd that it would go that quickly. I've tracked with toyota stock fluid in my last car, and never had this happen. I also checked the other 3 FR-S at the track, and their fluid is the proper color (their cars are all newer). Is subaru brake fluid known for doing this? Is is simply designed to change color to indicate it needs replaced? Or is their possibly some other problem?

CSG Mike · 06-25-2013, 04:32 PM

You're just improving as a driver (and your original fluid is getting old). Time to step up to a better fluid.

Rejor11 · 06-25-2013, 05:42 PM

I find it odd that you didnt notice any fluid boiling before on your first session! Youre simply braking harder than you initially did. Time to step up to race pads and high temp fluid. I recommend carbotech pads.

kvnchu · 06-25-2013, 05:48 PM

Quote:

Originally Posted by Rejor11

I find it odd that you didnt notice any fluid boiling before on your first session! Youre simply braking harder than you initially did. Time to step up to race pads and high temp fluid. I recommend carbotech pads.

Yeah agreed, rbf600 is a pretty good standard and xp10 all around. Prty much what alot of us use. CounterSpace carries it all if you were wondering, js ask Mike.

orthojoe · 06-25-2013, 06:41 PM

Congrats! This means you're a better driver now. Time to flush with some RBF600 and get some track pads now.

Dezoris · 06-25-2013, 07:53 PM

Looks like a nice aged whiskey. Get rid of it save the headaches, it's not designed for steady high temps.

icemang17 · 06-26-2013, 06:22 PM

interesting................I have found my FRS brake fluid just fine, but the pads are horrible...granted I am a racer who pushes the car quite hard.....but I don't think 1 year old fluid will boil.....

The stock brakes are good for maybe 15 minutes at best when pushed hard...I think your driving improved and now you are pushing beyond the limits of the stock brake pads.....fresh pads and better fluid will solve the issue...

My example...when I run on track I run with all traction control off.... I can almost make a 20min session before the brakes are cooked....with traction in sport mode....5-6 minutes at best....

A properly setup brake system will run for HOURS with no issues......my racer can run for around 25 hours before the pads wear to a point I need to replace them and change the fluid

Feffman · 06-30-2013, 08:31 AM

The Motul and Elf HTX brake fluids are what I've used a in a variety of cars for years and never had any brake fading issues. Contact Barry at Performance Oil Store (www.PerformanceOilStore.com) for either brake fluid.

Feff

markitect · 07-01-2013, 02:21 PM

Quote:

Originally Posted by icemang17

interesting................I have found my FRS brake fluid just fine, but the pads are horrible...granted I am a racer who pushes the car quite hard.....but I don't think 1 year old fluid will boil.....

The stock brakes are good for maybe 15 minutes at best when pushed hard...I think your driving improved and now you are pushing beyond the limits of the stock brake pads.....fresh pads and better fluid will solve the issue...

My example...when I run on track I run with all traction control off.... I can almost make a 20min session before the brakes are cooked....with traction in sport mode....5-6 minutes at best....

A properly setup brake system will run for HOURS with no issues......my racer can run for around 25 hours before the pads wear to a point I need to replace them and change the fluid

We were running 15 min sessions, on stock tires, so I was surprised to see it happen too.

CSG Mike · 07-01-2013, 02:23 PM

A few guys at the track cooked their brake fluid on stock pads, fluids, AND tires this past weekend. Novices too.

Maybe we need to put together a "first time track go-er" package.

RAWR BRZ · 07-01-2013, 02:41 PM

Quote:

Originally Posted by CSG Mike

A few guys at the track cooked their brake fluid on stock pads, fluids, AND tires this past weekend. Novices too.

Maybe we need to put together a "first time track go-er" package.

Well it was 117F that day... Track package sounds like a great idea.

Quote:

Originally Posted by icemang17

A properly setup brake system will run for HOURS with no issues......my racer can run for around 25 hours before the pads wear to a point I need to replace them and change the fluid

There is no way your car can run for 25hr with the same braking performance without replacing at least the pads... Unless you arent driving it hard the whole time.

sw20kosh · 07-01-2013, 06:59 PM

Cooked fluid does not mean better driver. All it tells you is you are using your brakes harder than the fluid can withstand.

Not saying you are one but I have seen bad drivers, who think that flailing the car back-and-forth and side-to-side braking as hard as they can makes them faster around the track, cook their fluid and pads.

/ducks for cover

kosoku · 07-08-2013, 08:40 PM

Quote:

Originally Posted by orthojoe

Congrats! This means you're a better driver now. Time to flush with some RBF600 and get some track pads now.

rbf600 DOT4?

CSG Mike · 07-08-2013, 08:45 PM

Quote:

Originally Posted by kosoku

rbf600 DOT4?

Sure is.

06-25-2013, 04:21 PM	#1
markitect Senior Member Join Date: Jun 2011 Drives: Scion FRS Location: Michigan Posts: 216 Thanks: 17 Thanked 59 Times in 39 Posts Mentioned: 1 Post(s) Tagged: 0 Thread(s)	Cooked my brake fluid!!! I ran my second HPDE this weekend, the car is over a year old, and my stock brake fluid rapidly degraded. It had no noticeable change after the first track day last year, but the result this time were this: I didn't notice any color change until after the last session, when I noticed I had spongy brakes at the end of the last session(clearly boiled some fluid), and then the color changed significantly. I find it odd that it would go that quickly. I've tracked with toyota stock fluid in my last car, and never had this happen. I also checked the other 3 FR-S at the track, and their fluid is the proper color (their cars are all newer). Is subaru brake fluid known for doing this? Is is simply designed to change color to indicate it needs replaced? Or is their possibly some other problem?

06-25-2013, 06:41 PM	#5
orthojoe Senior Member Join Date: Nov 2012 Drives: BRZ Location: USA Posts: 485 Thanks: 199 Thanked 339 Times in 158 Posts Mentioned: 20 Post(s) Tagged: 10 Thread(s)	Congrats! This means you're a better driver now. Time to flush with some RBF600 and get some track pads now. __________________ 2013 Subaru BRZ

06-25-2013, 07:53 PM	#6
Dezoris Senior Member Join Date: Aug 2012 Drives: FR-S Location: IL Posts: 2,857 Thanks: 519 Thanked 2,998 Times in 1,095 Posts Mentioned: 159 Post(s) Tagged: 1 Thread(s)	Looks like a nice aged whiskey. Get rid of it save the headaches, it's not designed for steady high temps. __________________ SAVAGEGEESE

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06-25-2013, 04:32 PM	#2
CSG Mike Join Date: Jul 2012 Drives: S2000 CR Location: Orange County Posts: 14,562 Thanks: 8,942 Thanked 14,211 Times in 6,854 Posts Mentioned: 970 Post(s) Tagged: 14 Thread(s)	You're just improving as a driver (and your original fluid is getting old). Time to step up to a better fluid.

06-25-2013, 05:42 PM	#3
Rejor11 Member Join Date: Jun 2012 Drives: Mini Cooper Location: Jacksonville, FL Posts: 90 Thanks: 1 Thanked 28 Times in 15 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	I find it odd that you didnt notice any fluid boiling before on your first session! Youre simply braking harder than you initially did. Time to step up to race pads and high temp fluid. I recommend carbotech pads.

06-26-2013, 06:22 PM	#7
icemang17 Senior Member Join Date: Jun 2012 Drives: Scion FR-S/ Subaru BRZ Location: Stockton CA Posts: 182 Thanks: 2 Thanked 107 Times in 55 Posts Mentioned: 13 Post(s) Tagged: 0 Thread(s)	interesting................I have found my FRS brake fluid just fine, but the pads are horrible...granted I am a racer who pushes the car quite hard.....but I don't think 1 year old fluid will boil..... The stock brakes are good for maybe 15 minutes at best when pushed hard...I think your driving improved and now you are pushing beyond the limits of the stock brake pads.....fresh pads and better fluid will solve the issue... My example...when I run on track I run with all traction control off.... I can almost make a 20min session before the brakes are cooked....with traction in sport mode....5-6 minutes at best.... A properly setup brake system will run for HOURS with no issues......my racer can run for around 25 hours before the pads wear to a point I need to replace them and change the fluid

06-30-2013, 08:31 AM	#8
Feffman Banned Join Date: Jun 2012 Drives: None Location: Gateway To The West Posts: 54 Thanks: 0 Thanked 10 Times in 9 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	The Motul and Elf HTX brake fluids are what I've used a in a variety of cars for years and never had any brake fading issues. Contact Barry at Performance Oil Store (www.PerformanceOilStore.com) for either brake fluid. Feff

07-01-2013, 02:23 PM	#10
CSG Mike Join Date: Jul 2012 Drives: S2000 CR Location: Orange County Posts: 14,562 Thanks: 8,942 Thanked 14,211 Times in 6,854 Posts Mentioned: 970 Post(s) Tagged: 14 Thread(s)	A few guys at the track cooked their brake fluid on stock pads, fluids, AND tires this past weekend. Novices too. Maybe we need to put together a "first time track go-er" package.

07-01-2013, 06:59 PM	#12
sw20kosh Senior Member Join Date: Jul 2012 Drives: 2013 Black FR-S Location: SF Posts: 3,030 Thanks: 881 Thanked 2,014 Times in 990 Posts Mentioned: 153 Post(s) Tagged: 1 Thread(s)	Cooked fluid does not mean better driver. All it tells you is you are using your brakes harder than the fluid can withstand. Not saying you are one but I have seen bad drivers, who think that flailing the car back-and-forth and side-to-side braking as hard as they can makes them faster around the track, cook their fluid and pads. /ducks for cover

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