Motul RBF600 - GT-R Register - Official Nissan Skyline and GTR Owners Club forum

markyboy.1967 · 23rd January 2006, 09:07 PM

Anyone heard horror stories about this brake fluid.I have just bout some for my R33 GTR and im now hearing stories about it rusting the brake system on cars if left in for around 6 months.I know a few of you guys have this brake fluid, so is there any truth in it?

Read the lower section of this posted link to see what i mean.

http://forums.evolutionm.net/archive.../t-172035.html

slegros · 25th January 2006, 05:40 PM

The first ive heard of it, and ive used it for years in just about anything ive owned. My one complaint about it is that ive never been able to get a really firm pedal using it. The system after having been properly bled(on several cars-new bottle evry time) seems to not give as firm a pedal as some other brake fluids, and I cant even guess why. The RBF has great temperature properties, but ive switched to using BP Super Dot 4 and prefer it. It still offers good resistance to fade and gives a rock hard pedal. A bit cheaper than the Motul as well.

Chris Wilson · 27th January 2006, 09:16 PM

As a general rule the higher the boiling point of none silicone brake fluids the more hygroscopic they are, which means the greater its affinity to water. So a race fluid will tend to pull more water vapour from the atmosphere through the reservoir breather, and via osmosis through rubber brake hoses and caliper seals. As such it should be changed more regularly than a normal road car fluid. If the mositure content gets high you can get internal corossion of the brake system, and fluid boiling when working the brakes hard. Fluid boil will result in the brake pedal hitting the floor with zero braking!! EXACTLY the same will happen with normal brake fluid, but it takes longer to occur, generally speaking.

GTR-Zilla · 28th January 2006, 11:55 AM

what is castrol response super 4.1 like for GTR's? I used this fluid to good effect on previous cars...

Chris Wilson · 28th January 2006, 01:03 PM

Brake fluid is brake fluid... Some have a higher dry oiling point than others, if you want / need the very best use Castrol SRF. I use Motul RBF600 in most things, as I prefer to make the brakes bigger rather than run small ones crazy hot and have to use exotic fluids

ftp://ftp.chriswilson.tv under relevant sounding folders to see the brakes and stuff i have made for my own R33 GTST. Cheers.

23rd January 2006, 09:07 PM	#1 (permalink)
markyboy.1967 New Users Join Date: Feb 2004 Location: Scotland Posts: 1,839	Motul RBF600 Anyone heard horror stories about this brake fluid.I have just bout some for my R33 GTR and im now hearing stories about it rusting the brake system on cars if left in for around 6 months.I know a few of you guys have this brake fluid, so is there any truth in it? Read the lower section of this posted link to see what i mean. http://forums.evolutionm.net/archive.../t-172035.html

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25th January 2006, 05:40 PM	#2 (permalink)
slegros GTR Register Member Join Date: Oct 2005 Posts: 149	The first ive heard of it, and ive used it for years in just about anything ive owned. My one complaint about it is that ive never been able to get a really firm pedal using it. The system after having been properly bled(on several cars-new bottle evry time) seems to not give as firm a pedal as some other brake fluids, and I cant even guess why. The RBF has great temperature properties, but ive switched to using BP Super Dot 4 and prefer it. It still offers good resistance to fade and gives a rock hard pedal. A bit cheaper than the Motul as well.

27th January 2006, 09:16 PM	#3 (permalink)
Chris Wilson GTR Register Member Join Date: Aug 2001 Location: Shropshire Posts: 1,557	As a general rule the higher the boiling point of none silicone brake fluids the more hygroscopic they are, which means the greater its affinity to water. So a race fluid will tend to pull more water vapour from the atmosphere through the reservoir breather, and via osmosis through rubber brake hoses and caliper seals. As such it should be changed more regularly than a normal road car fluid. If the mositure content gets high you can get internal corossion of the brake system, and fluid boiling when working the brakes hard. Fluid boil will result in the brake pedal hitting the floor with zero braking!! EXACTLY the same will happen with normal brake fluid, but it takes longer to occur, generally speaking.

28th January 2006, 11:55 AM	#4 (permalink)
GTR-Zilla Banned Join Date: May 2005 Location: London Posts: 2,099	what is castrol response super 4.1 like for GTR's? I used this fluid to good effect on previous cars...

28th January 2006, 01:03 PM	#5 (permalink)
Chris Wilson GTR Register Member Join Date: Aug 2001 Location: Shropshire Posts: 1,557	Brake fluid is brake fluid... Some have a higher dry oiling point than others, if you want / need the very best use Castrol SRF. I use Motul RBF600 in most things, as I prefer to make the brakes bigger rather than run small ones crazy hot and have to use exotic fluids ftp://ftp.chriswilson.tv under relevant sounding folders to see the brakes and stuff i have made for my own R33 GTST. Cheers.