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Old Dec 19th 2018, 06:57 AM   #11
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Originally Posted by RobertH View Post
If the fluid goes dark brown, do the brakes still work properly ?? This is the key point.
It doesn't appear to make too much of a difference to be honest. I ride track days in the fast group and have never had a problem with the brakes due to discoloured fluid.
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Old Dec 19th 2018, 07:23 AM   #12
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My honest opinion its from the rubber hoses used in the braking system... Sports car's don't show that kind of discoloration that fast or if ever to be honest
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Old Dec 19th 2018, 11:46 AM   #13
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Right, nor do any of my other bikes. As long as it doesn't affect the braking performance I don't really care, though it does look bad.
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Old Dec 19th 2018, 05:17 PM   #14
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Sometimes the rubber boot inside will stretch out accordion style from use/pressure etc. If it looks dark all of a sudden, you may be seeing the black of the rubber accordion boot behind the fluid. Like having a black backdrop behind a somewhat transparent foreground.

But, generally, it will brown over time due to a couple of reasons. Brake fluid is constantly trying to absorb moisture (hygroscopic) from anywhere it can. This is why you never leave a bottle unsealed for longer than is necessary. Moisture is just water and water has a much lower boiling point, which will in turn boil and cause steam thus darkening the fluid along with adding air to the line.

DOT 3, 4, and 5.1 are glycol based and are all hygroscopic and will absorb moisture. They also disperse this moisture throughout the system vs. pooling which can occur with silicone based DOT 5. But, DOT 5 will not absorb moisture, however, it is more compressible than it's glycol counterparts, leading to a more mushy brake feel. This is why our bikes come with glycol based fluid.

Another reason is the rubber hoses used in the system. They are made to withstand deterioration/corrosion, but over time, microscopic pieces will erode into the system, again making it darker.

Normal operation/heat will also cause discoloration due to chemical reactions taking place as the temperature rises and falls.

;TLDR; It's normal, it's ok and don't worry about it. Flush it every so often and you're good to go. Buy one of these: Pneumatic Brake Bleeder and some of this: Motul 660 Racing Brake Fluid. Change it in 5-10min tops and have nice pretty golden fluid. I do it before every track day. Mine is golden when I start the day and a dark brown by the end of the day.
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Old Dec 19th 2018, 07:15 PM   #15
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Originally Posted by BenF04 View Post
Every Ducati I have ever had has done it, its just one of those extra special features you get when you own a Ducati.
…yup...same here....Clutch & Rear Brake - and the Clutch Bleed after basically each ride
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Old Dec 22nd 2018, 01:49 AM   #16
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Originally Posted by BenF04 View Post
Every Ducati I have ever had has done it, its just one of those extra special features you get when you own a Ducati.
Just seen the same. Mine included, of course. I don’t no why but always happens and almost inmediatly.
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Old Dec 23rd 2018, 01:40 AM   #17
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Fwiw, KTMs do same. I find that completely bleeding system will stop it blackening so soon. I also wash the diaphragms with soapy water, rinse, dry and coat with rubber grease.
I have several bikes I have had same success with.
Also I don’t bother with special racing brake fluids. Any decent known brand works just fine.

Just one thing to keep in mind is that with abs the system is extensive and if not cleaned out completely , will contaminate your clean fluid. Both front and rear must be bled.
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Old Dec 23rd 2018, 10:11 PM   #18
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Does anyone have the workshop manual ? Can you please share the section that describes how to bleed the brakes ?

Some bikes with ABS may need the computer plugged in to run a special bleeding routine, I wonder if ours is like this ?

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Old Dec 24th 2018, 11:27 AM   #19
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I change my brake and clutch fluid every spring. It's not expensive if you do it yourself. This mini bleeder from Motion Pro really makes the job easier and cleaner. They are only about $25. I never heard of needing any kind of a computer to bleed brakes but honestly I would not be surprised..

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Old Dec 24th 2018, 12:02 PM   #20
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brake, discolour, fluid

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