How much is TOO much?

abm89 · 09-24-2015, 06:57 PM

Quote:

Originally Posted by osbornsm

Was a 75 Degree day, and relatively not-humid.

I also got a spongy pedal after the 4th run, so i packed it up after nearly-boiling the Motul i'm running.
Didn't want to flush a brake system that was still 300F.

Dang, i've never had any issues with the RBF600, granted the track I usually go to is not hard on braking.

ban25 · 09-24-2015, 08:19 PM

Quote:

Originally Posted by osbornsm

Was a 75 Degree day, and relatively not-humid.

I also got a spongy pedal after the 4th run, so i packed it up after nearly-boiling the Motul i'm running.
Didn't want to flush a brake system that was still 300F.

Try Castrol SRF. It's wet boiling point is 518F.

Rusty · 09-24-2015, 09:29 PM

Quote:

Originally Posted by osbornsm

Was a 75 Degree day, and relatively not-humid.

I also got a spongy pedal after the 4th run, so i packed it up after nearly-boiling the Motul i'm running.
Didn't want to flush a brake system that was still 300F.

You have brake coolinig ducts?

2011 Nismo#91 · 09-25-2015, 03:44 PM

Quote:

Originally Posted by abm89

Dang, i've never had any issues with the RBF600, granted the track I usually go to is not hard on braking.

You can boil any brake fluid if your dragging them.

rear brakes dragging?

Might not be your specific issue but with RBF600 AND cooling ducts there should be no reason to boil the fluid, unless it's full of water of course.

Hard tracking shouldn't boil fluid with that setup.

osbornsm · 09-25-2015, 05:28 PM

Quote:

Originally Posted by Rusty

You have brake coolinig ducts?

I have the stillen setup, and yes... brakes are still WAY hot.
- I have a full data log of the sessions in question, as listed above, however... brake pedal pressure/application is not one of the ECU fields.

Any chance moving from Carbotech XP8 to XP10 would help?
- or would that introduce more heat to the system??

I had to cut my last track day short because the Motul was getting spongy pedal results, and i didn't want to full bleed the system @ the track. *sigh

Thoughts?!?

2011 Nismo#91 · 09-25-2015, 05:52 PM

When was the last time you replaced your brake fluid? A tester isnt too expensive either, will tell you when theres too much water in the fluid.

osbornsm · 09-27-2015, 01:57 PM

Quote:

Originally Posted by 2011 Nismo#91

When was the last time you replaced your brake fluid? A tester isnt too expensive either, will tell you when theres too much water in the fluid.

Brake fluid is Motul RBF600 and gets bled before every session.

Oh, and bump for video added

09-25-2015, 05:52 PM	#21 (permalink)
2011 Nismo#91 A True Z Fanatic Join Date: Mar 2011 Location: NJ Posts: 2,400 Drives: slowly Rep Power: 40569	When was the last time you replaced your brake fluid? A tester isnt too expensive either, will tell you when theres too much water in the fluid.