SFV4S Brake Bleed

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So why does the fluid in the rear brake reservoir turn dark so quickly? Is it the heat?
 
On my 1199 I just swapped the fluid to a higher heat Motul one...RBF 660 if I remember right. The Motul never changed colors on me.

It may have been Motul 5.1, I cant remember which one I used. DOT 5.1 normally has a higher boiling point, but the Motul 660 is listed as 594 F but it a DOT 4. I'm guessing since its synthetic or made with unicorn tears it has a higher boiling point.

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660 is best DOT 5.1 is still a step below. I gave 5.1 a shot and it was still toast after like 1,000 miles. Same with 660 tho, renew every thousand miles. Probably more of a mental thing for me
 
Haven’t touched the fluid in the rear in 18 months. Looks brand new and I ride a few hundred miles a week. Never had any fluid discoloration brake or clutch. Motul 600/660
 
660 is best DOT 5.1 is still a step below. I gave 5.1 a shot and it was still toast after like 1,000 miles. Same with 660 tho, renew every thousand miles. Probably more of a mental thing for me

To be fair though, you are on a Pani. Hot air is being pushed back through the fairings, over the engine and directly on the rear res. Not so much of an issue on the SFv4.

I have RBF 660 in both brake systems and the clutch and no color change, that I can tell, in about 1000mi. Ofcourse, the SF rear res is smoked, so hard to tell the color change without opening.
 
Yeah factory V4 S model its a birds nest from the factory then ya throw on more wires for gps and phone its always gonna be messy.

Damn that thing has more wiring coming off the top end than some aircraft I’ve seen.
 
So what’s the rationale for putting on a reservoir sock? Protection from UV? To keep the sloshing liquid from distracting a rider?
 
my v4s has smoked reservoir too... unfortunately I can tell by feel that the system needs some tlc
 

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