Motul RBF600 or 5.1 brake fluid - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

JoeBoxer · 12-18-2012, 12:36 PM

It's hard to search stuff such as "5.1", i know a lot of people are running the RBF600 but i was wondering if the 5.1 would be worth upgrading over stock. I plan to visit a track maybe once next year but other that it's just my DD. The 5.1 is about half the cost and while the RBF600 isn't expensive if i don't need it i'd rather save the money.

AJ PwR · 12-18-2012, 09:02 PM

5.1 has much higher boiling temperature. RBF are made for race and they are not good for seals if you don't bleed and flush it often.

getbent · 12-18-2012, 10:32 PM

Race brake fluid is typically more hygroscopic, so unless you are going to be changing it regularly you would be better off with a standard DOT 3/4/5.1 fluid for a daily driver.

JoeBoxer · 12-18-2012, 10:37 PM

Cool thanks guys I don't plan on changing that often so I will get the 5.1 ordered.

CSG Mike · 12-28-2012, 12:29 PM

Use the "lowest" grade brake fluid that will get the job done. The higher the boiling point, the more hygroscopic the fluid generally is...

Also, pay attention to the wet boiling point; that's how tolerant the fluid is of water absorbed.

We use Project Mu G-four, as it is the highest dry boiling temp DOT4 fluid readily available to us. Castrol SRF is higher, but it's DOT5, and.... ULTRA expensive, and a general pita to switch to.

JoeBoxer · 12-28-2012, 12:52 PM

I have some GTR brake fluid just sitting here, thought about using that lol.

AZP Installs · 12-28-2012, 05:47 PM

Quote:

Originally Posted by AJ PwR

5.1 has much higher boiling temperature. RBF are made for race and they are not good for seals if you don't bleed and flush it often.

Actually I believe you are talking about 5.0 which is silicone based and not good for seals. 5.1 is fine for seals, it is usually more expensive and often times not needed unless you are actually racing.

-Mike Paisan

11+ Years Maintaining, Modifying and Educating TriState Subaru Enthusiasts.
Call directly as We carry almost every manufacturer now, so before you buy parts call us.
Like us on Facebook! | E-mail: sales@azpinstalls.com | 725 Fairfield Ave | Kenilworth, NJ 07033 | 908.248.AZP1 (2971) | T-1 Certified Amsoil Direct Jobber |AIM: AZP Installs
"Race Tested, Enthusiast Approved!"

AZP Installs · 12-28-2012, 05:50 PM

We have been racing and using ATE Superblue for the past 10-12 years. Very affordable, and has great properties both wet and dry. What we actually do is alternate between the ATE Superblue and the ATE Gold or the Motul RBF660.

The key is to flush the brake fluid every 2-3 years/30k miles on a street driven car. On a tracked car, even if you track it 1x a year you should also flush the brake fluid 1x a year.

-Mike Paisan

11+ Years Maintaining, Modifying and Educating TriState Subaru Enthusiasts.
Call directly as We carry almost every manufacturer now, so before you buy parts call us.
Like us on Facebook! | E-mail: sales@azpinstalls.com | 725 Fairfield Ave | Kenilworth, NJ 07033 | 908.248.AZP1 (2971) | T-1 Certified Amsoil Direct Jobber |AIM: AZP Installs
"Race Tested, Enthusiast Approved!"

12-18-2012, 12:36 PM	#1
JoeBoxer Senior Member Join Date: Jul 2012 Drives: Whiteout FR-S Location: Arkansas Posts: 4,154 Thanks: 1,666 Thanked 1,627 Times in 997 Posts Mentioned: 72 Post(s) Tagged: 0 Thread(s)	Motul RBF600 or 5.1 brake fluid It's hard to search stuff such as "5.1", i know a lot of people are running the RBF600 but i was wondering if the 5.1 would be worth upgrading over stock. I plan to visit a track maybe once next year but other that it's just my DD. The 5.1 is about half the cost and while the RBF600 isn't expensive if i don't need it i'd rather save the money.

12-18-2012, 10:32 PM	#3
getbent Senior Member Join Date: May 2012 Drives: 2013 FR-S Blue MT Location: Raleigh, NC Posts: 162 Thanks: 4 Thanked 37 Times in 26 Posts Mentioned: 3 Post(s) Tagged: 0 Thread(s)	Race brake fluid is typically more hygroscopic, so unless you are going to be changing it regularly you would be better off with a standard DOT 3/4/5.1 fluid for a daily driver. __________________ 2013 Scion FR-S \| 6MT \| UltraMarine

12-28-2012, 05:50 PM	#8
AZP Installs Join Date: Oct 2011 Drives: '11 STi->'14 BRZ \| '14 Touareg TDi Location: Kenilworth, NJ Posts: 1,269 Thanks: 359 Thanked 558 Times in 371 Posts Mentioned: 49 Post(s) Tagged: 0 Thread(s)	We have been racing and using ATE Superblue for the past 10-12 years. Very affordable, and has great properties both wet and dry. What we actually do is alternate between the ATE Superblue and the ATE Gold or the Motul RBF660. The key is to flush the brake fluid every 2-3 years/30k miles on a street driven car. On a tracked car, even if you track it 1x a year you should also flush the brake fluid 1x a year. -Mike Paisan 11+ Years Maintaining, Modifying and Educating TriState Subaru Enthusiasts. Call directly as We carry almost every manufacturer now, so before you buy parts call us. Like us on Facebook! \| E-mail: sales@azpinstalls.com \| 725 Fairfield Ave \| Kenilworth, NJ 07033 \| 908.248.AZP1 (2971) \| T-1 Certified Amsoil Direct Jobber \|AIM: AZP Installs *"Race Tested, Enthusiast Approved!"* Last edited by AZP Installs; 12-28-2012 at 06:40 PM.

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12-18-2012, 09:02 PM	#2
AJ PwR Join Date: Jan 2012 Drives: R35 R56 CZ4A ZC6 Location: Vancouver B.C. Posts: 284 Thanks: 1 Thanked 190 Times in 77 Posts Mentioned: 6 Post(s) Tagged: 0 Thread(s)	5.1 has much higher boiling temperature. RBF are made for race and they are not good for seals if you don't bleed and flush it often.

12-18-2012, 10:37 PM	#4
JoeBoxer Senior Member Join Date: Jul 2012 Drives: Whiteout FR-S Location: Arkansas Posts: 4,154 Thanks: 1,666 Thanked 1,627 Times in 997 Posts Mentioned: 72 Post(s) Tagged: 0 Thread(s)	Cool thanks guys I don't plan on changing that often so I will get the 5.1 ordered.

12-28-2012, 12:29 PM	#5
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)	Use the "lowest" grade brake fluid that will get the job done. The higher the boiling point, the more hygroscopic the fluid generally is... Also, pay attention to the wet boiling point; that's how tolerant the fluid is of water absorbed. We use Project Mu G-four, as it is the highest dry boiling temp DOT4 fluid readily available to us. Castrol SRF is higher, but it's DOT5, and.... ULTRA expensive, and a general pita to switch to.

12-28-2012, 12:52 PM	#6
JoeBoxer Senior Member Join Date: Jul 2012 Drives: Whiteout FR-S Location: Arkansas Posts: 4,154 Thanks: 1,666 Thanked 1,627 Times in 997 Posts Mentioned: 72 Post(s) Tagged: 0 Thread(s)	I have some GTR brake fluid just sitting here, thought about using that lol.

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