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Tech1

05 Low Brake Fluid

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Tech1

My 05 suddenly had the brake failure light flashing.  Plugged in a gs911, had codes for low front brake pressure too low (24970) and brake fluid level too low (25193), the brakes still worked fine.  Standard front and rear reservoir levels were ok, so I took a look at the abs unit; the front chamber level was fine but the rear chamber level was definitely low.  I figured that maybe I didn't properly get the air purged and level set on the rear circuit when I flushed the abs a couple years ago and after the pads wore, the level dropped.  I know you should push the pads in before setting the level, but I was a bit impatient and just filled it to the normal level, figuring I would deal with it at the next pad replacement.  All seemed fine, no more warnings.  Now I notice what looks like brake fluid on the floor near the center stand, after sitting a day, after about a 100 mile ride.  I should note that earlier I did do an oil change earlier this season and shortly after I had what I thought at the time was a bit of an oil drip in the same location, I figured I just didn't get something wiped up from around the filter.  Now I am not so sure, thinking that it was probably brake fluid, likely dripping from the overflow.  Thoughts on what could push the fluid out the overflow?

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dirtrider
7 hours ago, Tech1 said:

My 05 suddenly had the brake failure light flashing.  Plugged in a gs911, had codes for low front brake pressure too low (24970) and brake fluid level too low (25193), the brakes still worked fine.  Standard front and rear reservoir levels were ok, so I took a look at the abs unit; the front chamber level was fine but the rear chamber level was definitely low.  I figured that maybe I didn't properly get the air purged and level set on the rear circuit when I flushed the abs a couple years ago and after the pads wore, the level dropped.  I know you should push the pads in before setting the level, but I was a bit impatient and just filled it to the normal level, figuring I would deal with it at the next pad replacement.  All seemed fine, no more warnings.  Now I notice what looks like brake fluid on the floor near the center stand, after sitting a day, after about a 100 mile ride.  I should note that earlier I did do an oil change earlier this season and shortly after I had what I thought at the time was a bit of an oil drip in the same location, I figured I just didn't get something wiped up from around the filter.  Now I am not so sure, thinking that it was probably brake fluid, likely dripping from the overflow.  Thoughts on what could push the fluid out the overflow?

Morning  Tech1

 

Thoughts on what could push the fluid out the overflow?-- Usual cause is overfilling the module reserviour with worn brake pads, then when barke pads are pushed back it kicks excess fluid out of the reservoir vent.

 

Or, sometimes they will kick a little fluid out of the ABS module vent if the motorcycle  is laid on it's side for  while. 

 

If the ABS module is kicking fluid out the vent for no reason & you haven't overheated & boiled the brake fluid (fluid that contained moisture)  then I really don't know what caused it. 

 

Is it possible that the fluid is not leaking out the event but leaking from a line or fitting??? 

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Tech1

It stopped coming out the overflow "again?" and I don't have any warnings.  I will ride for a while and see what happens.  I guess I could understand if I happened to overfill it this time in my haste.  Still I didn't do anything with the pads, so why did it start coming out the overflow about 2 years after it was flushed and end up low?

I have been trying to come up with reasons to buy a new shiftcam, I guess.  The potential issues on the brakes, and now I found a crack starting on one throttle cam, maybe it is time!   Thanks for the input.

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dirtrider
10 hours ago, Tech1 said:

It stopped coming out the overflow "again?" and I don't have any warnings.  I will ride for a while and see what happens.  I guess I could understand if I happened to overfill it this time in my haste.  Still I didn't do anything with the pads, so why did it start coming out the overflow about 2 years after it was flushed and end up low?

I have been trying to come up with reasons to buy a new shiftcam, I guess.  The potential issues on the brakes, and now I found a crack starting on one throttle cam, maybe it is time!   Thanks for the input.

Morning  Tech1

 

Has the motorcycle been over on it's side recently? That can allow fluid onto the vent. 

 

Is the rear wheel crown bearing loose? That can allow the brake rotor to kick the brake pads back.

 

Possible but not likely, there could have been A LOT of moisture in the rear brake fluid,  then using the brakes hard & continuous could have boiled the fluid causing the moisture to turn into steam & expand therefore pushing fluid out. (again unlikely)  

 

 

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Tech1

It hasn't been on it's side in a few years!  I am going to look up when if the rear flange recall was done before or after I did the brake flush and I will do a good check on the crown bearing.  Thanks for pointing out the things to check.

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dirtrider
39 minutes ago, Tech1 said:

It hasn't been on it's side in a few years!  I am going to look up when if the rear flange recall was done before or after I did the brake flush and I will do a good check on the crown bearing.  Thanks for pointing out the things to check.

Afternoon Tech1

 

They probably pushed the rear brake pads back when they did the rear flange recall. (this could explain  the fluid in the vent line)

 

But that doesn't explain how the rear reservoir went low. (make sure you don't have a seeping line or connection)

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Tech1

Went for an 80 mile back roads ride, parked it on the center stand, one tiny drop of something on a paper towel underneath.  Brakes feel fine.  Going to ride a bit longer, hate to waste the great weather we have here right now.  I will tear into it a bit when it is more convenient, unless something pushes me into doing something sooner.  At least I don't have any long distance rides planned this year.

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