Puzzle: Black "Greasy" stuff on Front Disk


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SilverDave
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Puzzle: Black "Greasy" stuff on Front Disk

Post by SilverDave »



My 1200 brakes were working perfectly about a week ago, and went " mushy" about 3 days ago. When I got home , I felt behind the Disk cover ... a lot of black greasy stuff on the right front disk.
AGH ! ( Grease is just brake pad dust thickened oil, I presume )

About 9 months ago, I "repaired" the leaky right front fork seal with a " Seal Doctor " ..
.. Easy to do , and held all summer !
But its back ... with a vengeance !

Questions and Possibilities :

1) It could be fork oil .. but the top seal area , and top of fork seems "dry " ... Could the leaky seal fork fluid drip away , or blow away ?
Bottom 4 inches of fork are also covered with spots of this " Grease ".... but top seems clear .... Hmmm

2) I guess it could be brake fluid ... but hand brake lever still seems very firm .. I guess it would have to be leaking thru the piston ?? Is this possible ?

3 ) (which I have never heard of ) Lower Fork could be leaking fork oil THRU the anti dive mechanism ??
Those large o rings are probably original ( 31 years )

and choice 4) I have somehow angered the motorcycle gods .. I must get one of those little bells ... LOL

Bike comes off road this week .. and at least , new brake pad , and clean up of disks and stuff.
Possible new fork seals as well.


So from #1 , #2 #3 which is the most likely culprit, in the opinion of the board ??

Thanks to all
SilverDave



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thrasherg
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Re: Puzzle: Black "Greasy" stuff on Front Disk

Post by thrasherg »

It could also be grease from the front wheel bearings. When they start to fail they often start to leak grease and it gets on the disk!! Just something else to consider, is it the side that has the speedo drive?

Gary

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SilverDave
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Re: Puzzle: Black "Greasy" stuff on Front Disk

Post by SilverDave »

No ... its the right side , away from the GL1200 speedo unit ...
Can axel grease fail from either end ?

SilverDave

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roadwanderer2
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Re: Puzzle: Black "Greasy" stuff on Front Disk

Post by roadwanderer2 »

well, if you want to find out if its brake fluid, put a dab on your finger and taste it but DON'T SWALLOW IT, spit it out, you'll know if its brake fluid or not. yes, its possible it could be axle grease, the wheel has grease seals on both sides. i would check the axle seals, replace them if needed, then check the caliper piston boots for any rips, tears or leaks in them and replace them if needed. while you have the front wheel off, run you hand up and down the entire length of both forks and anti-dives to see if you have any fork oil leaks and replace the fork seals if needed.

remember, if your brake pads are contaminated with any kind of grease or brake fluid, you MUST replace them. that grease or fluid will seep thru them and the pads are ruined. no amount of brake cleaner or sanding will get that fluid out of the pads. make sure when you install the new pads not to get any fluid or grease on them, if you do, clean them as quickly as possible with brake cleaner and sandpaper so the new pads dont get ruined.

stuart.

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Re: Puzzle: Black "Greasy" stuff on Front Disk

Post by Rusty Bike »

You say brake pedal went mushy 3 days prior to this discovery, right front caliper is suspect. Yes, they can leak past piston seals. Should be pretty easy to find source of leak. Take off any bling and look. Good luck...Rusty

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geraldm
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Re: Puzzle: Black "Greasy" stuff on Front Disk

Post by geraldm »

if its the pistons there will be oil behind the rubber dust seals on the pistons . same as the anti dive if the o ring is leaking there will be oil behind the tiny SOFT rubber seal so be careful with it they are very delicate . if its the top fork seal it will show up on the dust scraper seal as a oil film and most definitely there should be some dust where ever it is leaking if indeed it is leaking there . does your brakes ever feel like they are dragging after stopping at a light , it is possible also that your pads are wearing at a fast rate . spin your wheel and see if the brakes drags or the wheel brgs make noise .

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Re: Puzzle: Black "Greasy" stuff on Front Disk

Post by stinvinn »

[quote][/quote]well, if you want to find out if its brake fluid, put a dab on your finger and taste it but DON'T SWALLOW IT, spit it out


HAHAHA I LOLD :lol: :lol: :lol: :lol: :lol:

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Re: Puzzle: Black "Greasy" stuff on Front Disk

Post by geraldm »

stinvinn wrote:
well, if you want to find out if its brake fluid, put a dab on your finger and taste it but DON'T SWALLOW IT, spit it out


HAHAHA I LOLD :lol: :lol: :lol: :lol: :lol:
I'd be hoping for brake fluid If it doesnt taste like brake fluid you never know what it might be :mrgreen:

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Re: Puzzle: Black "Greasy" stuff on Front Disk

Post by Rusty Bike »

Hmm, I'll have to go taste some for future reference. A shot of DOT 4 please!

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Re: Puzzle: Black "Greasy" stuff on Front Disk

Post by roadwanderer2 »

thats ok guys, laugh if you want, but if you've ever gotten a taste of brake fluid by accident, you'll know what it tastes like, but if you haven't, may i suggest you do so you'll know what to expect. have you ever tried to siphon gas from a hose and got some in your mouth? same thing can happen if you've ever tried to siphon brake fluid from a caliper with a small tube. trust me, it don't taste good.

stuart.

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SilverDave
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Re: Puzzle: Black "Greasy" stuff on Front Disk

Post by SilverDave »

LOL.... so basically , I should poison myself in order to find out what this stuff is ??

LOL LOLOLOL

Then I would not have to fix the forks , as I might be in the emergency ward ....

Is there not a less dangerous way, like paper Chromatography ??

SilverDave

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Re: Puzzle: Black "Greasy" stuff on Front Disk

Post by geraldm »

Just feel it between your fingers oil is slippery brake fluid is not.

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Re: Puzzle: Black "Greasy" stuff on Front Disk

Post by roadwanderer2 »

look, its not like im not telling you to DRINK the stuff, just wipe a drop on your fingertip and touch it to your tongue. it's not that hard to do. it's not gonna kill ya.

stuart.
Last edited by roadwanderer2 on Sat Dec 03, 2016 4:33 pm, edited 1 time in total.

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roadwanderer2
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Re: Puzzle: Black "Greasy" stuff on Front Disk

Post by roadwanderer2 »

geraldm wrote:Just feel it between your fingers oil is slippery brake fluid is not.
if the brake fluid is clean and fresh, it will feel slippery.

stuart.

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Re: Puzzle: Black "Greasy" stuff on Front Disk

Post by julimike54 »

SilverDave what's going on here??????????????
Image
Riding anything is a good day!
Mike

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Re: Puzzle: Black "Greasy" stuff on Front Disk

Post by SilverDave »

Well firstly its very cold here, and my garage is unheated, and most of the forks are (cold) metal ... so everything is on hold for awhile.

The puzzle was ( and still is ) how did any oil get all over the pads and brake disks, and not leave any trace along the upper part of the fork ???

However, before I covered it up for a month, I gently eased up the fork dust covers :
-one was dry and clean
-the other had about 2 cc of fork oil on top of the seal , under the dust seal .

Aha .. so a seal job is in order , when it warms a little ...
.... and new pads I guess , unless they can be safety cleaned .

but I am still puzzled, the upper fork had no oil on it , that I could feel . Perhaps it washed away , or blew away in the fall weather ??

SilverDave

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Re: Puzzle: Black "Greasy" stuff on Front Disk

Post by roadwanderer2 »

Dave, im gonna tell you straight out, by the time you get around to working on the brakes, those pads WILL be ruined. i have my ASE certification in brakes and im telling you unless you clean and sand down the pads OR shoes right away, they are no good anymore. the fluid WILL seep thru them to the steel backing. since the pads for these wings are cheap enough, just replace them. make sure you don't get any grease, brake fluid or fork oil on them when installing them. if you do, clean them with brake cleaner and sand them down until you get a clean surface.

stuart.

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Re: Puzzle: Black "Greasy" stuff on Front Disk

Post by SilverDave »

Thanks RW
You are right ...
but pads are pretty cheap , compared to my life, So I am just gonna replace them , I think.
I appreciate your concern , though ..

SilverDave

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Re: Puzzle: Black "Greasy" stuff on Front Disk

Post by roadwanderer2 »

your very welcome.

MERRY CHRISTMAS EVERYBODY FROM Mr. and Mrs. roadwanderer2.

stuart.

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Re: Puzzle: Black "Greasy" stuff on Front Disk

Post by Rusty Bike »

@ Silverdave, ya know, there are drain plugs/bolts at the bottom of the forks, I wonder if they are loose??? I can't remember which bolts they were, they are on the side of the fork by the Trac system. I'd have to look at my bike to spot them.

Thanks Stuart, Merry Christmas to you and yours, be safe...Rusty

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Re: Puzzle: Black "Greasy" stuff on Front Disk

Post by roadwanderer2 »

and a merry Christmas and a happy and healthy new year to you and yours also rusty.

Mr. and Mrs. roadwanderer2.
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