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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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      05-11-2018, 10:33 AM   #23
CosmosMpower
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I use RBF600 and Hawk DTC 70 with no issues.
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      05-16-2018, 03:48 PM   #24
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+1 Motul RBF 600 or 660

SRF is great, too.

Although I flush regularly given the heat stress to the fluid, so I don't go the SRF route
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      05-25-2018, 07:37 AM   #25
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Quote:
Originally Posted by TampaF87 View Post
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.
Did you have a link to the F80 guide you speak of, per chance?

Thanks!
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      09-18-2019, 01:28 PM   #26
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Everyone recommends SRF but it's Silicon based instead of Glycol based.

Does that raise any concerns?
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      09-18-2019, 02:21 PM   #27
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Quote:
Originally Posted by Insane_Dawe View Post
Everyone recommends SRF but it's Silicon based instead of Glycol based.

Does that raise any concerns?
I believe it's not actually Silicon based, that's a common misconception. Silicon based is DOT 5.1. I think.
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      09-18-2019, 11:08 PM   #28
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Been using Gulf R1000 on a few cars and on M2 with great success !
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      09-19-2019, 02:49 AM   #29
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Quote:
Originally Posted by Insane_Dawe View Post
Everyone recommends SRF but it's Silicon based instead of Glycol based.

Does that raise any concerns?
Itís a DOT3/DOT4 fluid and compatible with all DOT3 and 4 fluids. Not DOT5 (silicone).

https://msdspds.castrol.com/bpglis/F...JAE-B8VK5T.pdf

Iíve been using SRF for roughly 25 track days from June 2018 to last weekend. Iíve gotten the brakes hot enough to discolor the calipers (as many have), and to heat check the rotors. Pedal has never gone soft. Iíve done a full flush twice, and a couple bleeds in between. The fluid Iíve removed has been close enough to new in color that it has been difficult to identify the fresh fluid when flushing. First flush was at the start of the season, and second was when I rebuilt the front calipers due to slightly uneven pad wear on one side and cooked dust seals.

Iím confident thereís no need to flush more often than 1x/year. Agree with others that itís long life and consistent performance is worth the added cost, and probably comes out cheaper in the long run vs more frequent flushes with other fluids.
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