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-   -   Hydraulic brake issues... (http://www.twowheelfix.com/showthread.php?t=12304)

Sean 12-19-2009 12:07 PM

Hydraulic brake issues...
 
The brakes on my KTM don't grab until the lever is basically on the bar. Is that necessarily air in the lines or is it something else? It grabs fine, not spongy at all, just way late.

I'm supposed to go ride today and I don't have any brake fluid so I'm hoping it's something else but I can't find anything :/

BobTheBiker 12-19-2009 02:06 PM

sounds like air in the lines, or a MAJOR problem. I'd go buy some brake fluid, and begin looking for the cause. not safe to ride until problem is fixed IMO.

Kerry_129 12-19-2009 02:13 PM

Sounds like a mechanical issue w/ the lever/pivot/plunger, if it's not spongy at all.

Agreed on not riding until identifying & correcting.

Sean 12-19-2009 04:48 PM

Quote:

Originally Posted by BobTheBiker (Post 308132)
or a MAJOR problem.

Such as?

I'm an pretty pathetic with tools...I'll go bleed 'em and see if it fixes anything, but beyond that it's likely going to a shop. The plunger looks ok /shrug

Sean 12-19-2009 07:32 PM

Well bleeding made it grab in the normal spot, but when I bled it it was mostly air that came out. I think there's a leak around the bleeder. It grabs earlier now but it's super grabby and doesn't have much modulation.

Kerry_129 12-19-2009 07:48 PM

Quote:

Originally Posted by Sean (Post 308191)
It grabs earlier now but it's super grabby and doesn't have much modulation.

Maybe there's been an air pocket slowly forming there for a while & you've gotten used to it, making it feel 'grabby' now in comparison?

BobTheBiker 12-19-2009 10:09 PM

I'd still do a good check to make sure nothing is amiss. a brake system shouldnt let air in, at all.

Gas Man 12-19-2009 11:18 PM

Does it ever firm up?

The brakes you F'in homos!

BobTheBiker 12-19-2009 11:40 PM

Quote:

Originally Posted by Gas Man (Post 308264)
Does it ever firm up?

thats what SHE said!

Sean 12-19-2009 11:40 PM

Did I have a post deleted? Yes, it gets firm, but it becomes totally grabby. It never bleeds clean though, it constantly coughs up a ton of air.

Gas Man 12-20-2009 12:31 AM

So it does pump up firm?

Are you rolling it when it becomes spongy again?

BobTheBiker 12-20-2009 06:34 AM

this indicates you either have a HUGE air pocket, or you need to take it to the shop to be repaired due to a major air indtroductory point somewhere.

Tmall 12-20-2009 08:55 AM

Plus one to Bob. Be careful, hate to have you seriously injured over this.

wildchild 12-22-2009 02:34 PM

if it isn't bleeding out clean then you aren't done yet. The air pockets can be quite large and sometimes frustrating to get out. Keep trying.

i think what gas is saying is when the lever goes to the bars can you pump it a few times (this is not while bleeding, but while riding) and it begins to feel more normal?
kind of like a car, when the brakes are spongy you "pump them up" same thing. if this is the case and the lever remains firm as you squeeze it after pumping it up then you probably just have an air pocket.
if you have a leak the lever will most likely not firm up from pumping.

Sean 12-24-2009 03:59 PM

Well it stops fine now. But it's still coughing up a ton of (mostly) air when I bleed it. I wonder if I'm just doing it wrong but I sure don't think I am.

Homeslice 12-24-2009 04:45 PM

Check the slave cylinder down near the engine to see if it's leaking fluid.

Sean 12-24-2009 05:47 PM

Quote:

Originally Posted by Homeslice (Post 310395)
Check the slave cylinder down near the engine to see if it's leaking fluid.

Hrm? Cable goes from the handlebar down the forks, nowhere near the motor...were you thinking the rear brake? This is for the front...or am I missing something?

BobTheBiker 12-24-2009 06:43 PM

I think he was thinkin hydro clutch.

Homeslice 12-24-2009 07:58 PM

Yeah as soon as I heard hydraulic, I thought you were talking about clutches.


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