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Old Dec 18th 2018, 03:26 PM   #1
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why does the brake fluid discolour ?

Any ideas ? My rear brake reservoir looked like it has coffee in it, and the front wasn't much better. I took it back to the dealer and asked them to flush the system & bleed the brakes. They did so in what I thought was perhaps a suspiciously short time, given all the ABS system. Rear has discoloured again 1-2 weeks later.

This seems to show up in some online photos eg from accessories : https://www.revzilla.com/motorcycle/...gale-v4-s-2018 (look closely at the rear)

Does this happen to everyone ? Any thoughts ?

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Old Dec 18th 2018, 03:30 PM   #2
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Great question, let's see what pops up.
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Old Dec 18th 2018, 03:41 PM   #3
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Dealer said "oh yeah those Brembos, they all do it"
"Bullshit, this is a safety issue" I said

What do you guys think, does this happen to everyone, is it a concern, does it affect braking performance ?

How do you really bleed the brakes ? Anyone with the workshop manual care to share the procedure ? I suspect it may need the computer.

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Old Dec 18th 2018, 03:49 PM   #4
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I Ride: '18 V4 "S" '12 1199 Tricolore '09 Xerox 848 '03 1100XX '09 Repsol 1000RR 50th Anv
I had this issue with my V4 S it seems it is a common malady with the rear brake reservior mine went a purple/black colour.
I had a Ducati Corse sock over it like my other reserviors up top to stop solar degredation if you leave your bike in the sun allot we get plent of sun here in the west.
Anyway its to do with A) The location of the reservior getting allot of heat from the rear cylinder B) The type of brake fluid used by Ducati.

My dealer flushed & bled the system (F.O.C) and put in some hi tec stuff think it was a racing type brake fluid that could handle high temps.
Anyway a few weeks in and @1500 klms it seems ok it looks like the "R" is going to have the same problem.
Funny thing is there was another V4 in for 2 tyres when mine went in his had 6.5K klm's on it and his rear brtake fluid was not discoloured.
I think that maybe the sock held in more heat than normal but I am keeping a close eye on it definately do not want issues with the back brake.
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Old Dec 18th 2018, 04:48 PM   #5
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Every Ducati I have ever had has done it, its just one of those extra special features you get when you own a Ducati.
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Old Dec 18th 2018, 06:22 PM   #6
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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.
My Multistrada does the same thing. My rear master cylinder sits right above the exhaust pipes and just behind the vertical cylinder. It gets discolored a lot faster than the front brakes and clutch fluid.
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Old Dec 18th 2018, 07:33 PM   #7
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If the fluid goes dark brown, do the brakes still work properly ?? This is the key point.
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Old Dec 19th 2018, 01:42 AM   #8
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Best solution i've read so far is: put a sock over your reservoir
When you don't see it, the problem is not there
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Old Dec 19th 2018, 03:24 AM   #9
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race teams put those wrist/sweat bands over the reservoir to catch fluid and protect the fluid and plastic from shock and maybe even sunlight possible temp regulation

sunlight IMO is not the concern . it probably doesn't get past the plastic.

the dark color is from heat and contamination .

I've seen pieces of black rubber inside the fluid that is a real problem. this browning affect is simply part of the process .

you'd be surprised how dark the suspension fluid is in your bike. it goes in clear and comes out black or grey . and this color change starts to happen almost the second you drive away from the dealership. same goes for brake fluid .
(suspension fluid gets way more contamination from metal to metal contact though )

My guess is that the reason the clutch fluid stays clear longer is because it is not exposed to the heat that the brakes are . my best guess.
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Old Dec 19th 2018, 03:49 AM   #10
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Originally Posted by RobertH View Post
Dealer said "oh yeah those Brembos, they all do it"
"Bullshit, this is a safety issue" I said

What do you guys think, does this happen to everyone, is it a concern, does it affect braking performance ?

How do you really bleed the brakes ? Anyone with the workshop manual care to share the procedure ? I suspect it may need the computer.

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Fyi there is a common mistake people make when riding where they unknowingly drag the rear brake while riding. I've seen people doing it on the track during performance schools.
I don't use my rear brake much on the street so I cannot imagine the rear brake fluid is any darker than my front on my street bike or my track bike for that matter.
dragging the rear brake can cause the fluid to boil which in turn will eventually cause the rear wheel to lock up potentially

also
this is not a ducati or a brembo thing All bikes do this -trust me
I've owned over 30 brand new bikes and they all do this I't is much more noticeable in the bikes that have the clear plastic cup style reservoir .

key point here to understand:
If brembo was slightly more prone to darkening the fluid its because brembo brakes are better and they are hands down better to the crap that comes on the japanese bikes. again trust me on this one.
brembo is simply better at making friction and friction converts kinetic energy into heat . more heat will darken the fluid slightly faster. so this is the life of owning a performance bike and it is on you to change your fluid when it is due .
stay safe and enjoy your bike
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