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M2 Technical Topics > Mechanical Maintenance: Break-in | Oil & Fluids | Servicing | TSB | Recalls > What Brake Fluid Recommended for Track?

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      10-01-2017, 02:50 PM   #1
mailman411
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What Brake Fluid Recommended for Track?

One track day at Big Willow and my brakes are already feeling soft and mushy. Is there a specific brand and type of high temp brake fluid that is good for M2? I will probably pick up the Pagid RS 29 pads (first time ever, will see if I can live with it for DD).

Thanks!
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      10-01-2017, 03:07 PM   #2
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Castrol SRF best all round. Similar to other top brands for dry boiling point but better - in some cases far better - wet boiling point.
You get what you pay for as its expensive.
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      10-01-2017, 05:33 PM   #3
mailman411
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https://www.amazon.com/Castrol-SRF-R...000JL760C?th=1

Want to make sure this is it in the Amazon link. Also, would 1 bottle be enough?

Thanks!
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      10-02-2017, 12:36 PM   #4
greasypeanut
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That link is correct. 1 liter should be enough. If it's your first time doing it yourself, maybe pick up some extra
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      10-03-2017, 11:38 AM   #5
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Thanks guys.
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      10-03-2017, 01:53 PM   #6
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I use RBF600
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      10-03-2017, 06:44 PM   #7
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I use RBF600
+1
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      10-03-2017, 06:48 PM   #8
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I went with SRF. I got two bottles because it was difficult to tell when the stock fluid was flushed out. You could definitely get by with one but if you want to be extra certain you got the stock fluid out go with two bottles.
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      10-09-2017, 08:40 PM   #9
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Quote:
Originally Posted by M+M View Post
Castrol SRF best all round. Similar to other top brands for dry boiling point but better - in some cases far better - wet boiling point.
You get what you pay for as its expensive.
+1. I change it once per season. SRF saves time and time is money.
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      10-09-2017, 10:13 PM   #10
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I have used Motul 660 on all my track cars including the M2...it's all you need and price appropriate.
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      10-10-2017, 03:49 AM   #11
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https://rennlist.com/forums/racing-a...strol-srf.html

Here is the range of debate in this thread. Wet boiling point is key especially if use is in wet or high humidity conditions. My understanding is that fluid absorbs a lot more moisture as it heat cycles in wet conditions as in racing (vs just sitting at constant temp open bottle on a shelf). My application is rally - winter and summer - so I regard it as cheap insurance not expensive fluid.
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      10-13-2017, 10:59 AM   #12
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Quote:
Originally Posted by Polo08816 View Post
+1. I change it once per season. SRF saves time and time is money.
Agree. SRF is cheaper for this reason. Been changing/flushing only once per season for many years.
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      01-29-2018, 05:46 PM   #13
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+1 on RBF600, use that on my race motorcycle. RBF660 offers a little better feel but seems to soak up moisture faster and require more frequent flushing.

This is on a motorcycle however, so brake feel is huge and what seems like small changes are more noticeable.
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      01-29-2018, 10:28 PM   #14
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Anybody have any problems on the stock fluid for one day? Car only has like 1800 miles on it...so just barely broken in. Or should I just swap to SRF? Going to be running Pagid RS29.

What is the stock fluid?
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      01-29-2018, 11:29 PM   #15
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Quote:
Originally Posted by lax01 View Post
Anybody have any problems on the stock fluid for one day? Car only has like 1800 miles on it...so just barely broken in. Or should I just swap to SRF? Going to be running Pagid RS29.

What is the stock fluid?
Honestly, it depends on your driving style. If you are a beginner learning to do threshold braking then you'd be fine; however, brake fluids are cheap, and gives you a lot of confidence turn after turn. On the plus, it great for canyon driving as well!

I don't know what's the standard brake fluid in our cars.
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      04-29-2018, 07:02 PM   #16
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Quote:
Originally Posted by lax01 View Post
Anybody have any problems on the stock fluid for one day? Car only has like 1800 miles on it...so just barely broken in. Or should I just swap to SRF? Going to be running Pagid RS29.

What is the stock fluid?
After my second track day (first time running RS29s), I boiled the OEM brake fluid. Thinking of switching to SRF.

I believe if you're running stock pads they'll fade before you boil your fluid.
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      04-29-2018, 07:57 PM   #17
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FWIW, I swapped to SRF for my first day in this car (not first track day) and I didn't have any problems
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      05-01-2018, 12:05 PM   #18
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Been looking for break fluid recommendations, great to find this thread. I've been running RS29s with stock fluid but I think it's time to change for the next track days.

On a side note, does anybody have a guide to flush the brake fluid on the M2? Looked online but couldn't find much (specifically for M2...unless it's the same as other BMW models). Thanks.
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      05-02-2018, 10:32 AM   #19
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Quote:
Originally Posted by norberts View Post
On a side note, does anybody have a guide to flush the brake fluid on the M2? Looked online but couldn't find much (specifically for M2...unless it's the same as other BMW models). Thanks.
You could use the F80 guide for the M3/M4. Same brakes.


As for which fluid, Motul RBF660 is great if you are only going to track. Updated performance slightly over the RBF600, but if you are regularly driving on the street, the 660 will pick up more moisture and require more frequent changes. RBF600 is a better dual-purpose fluid. I hear great things about on-track performance of the Castrol SRF, but I haven't heard much about how it is to drive on the street.

I've always used RBF600.
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      05-02-2018, 11:04 AM   #20
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Quote:
Originally Posted by norberts View Post
Been looking for break fluid recommendations, great to find this thread. I've been running RS29s with stock fluid but I think it's time to change for the next track days.

On a side note, does anybody have a guide to flush the brake fluid on the M2? Looked online but couldn't find much (specifically for M2...unless it's the same as other BMW models). Thanks.
I'm running SRF and Pagid RSL29s. No issues at all on track.

Flushing the brakes on the M2 is the same as any 2/3/M car with brembo calipers. Guides for those cars will also work for you. I use a Schwaben bleeder to pressurize the master cylinder reservoir to push the fluid out. 1L is more than enough for the entire system.


Quote:
Originally Posted by TampaF87 View Post
I hear great things about on-track performance of the Castrol SRF, but I haven't heard much about how it is to drive on the street.
SRF works just fine on the street. You won't notice a difference in feel vs the stock fluid.
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      05-03-2018, 08:41 AM   #21
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We usually use RBF660 and RSL29's
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      05-10-2018, 12:41 PM   #22
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RBF600
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