Reply With QuoteSounds like you have the wrong brake fluid in it...
Master cylinder part #H0205.1AA
I also have a used one if your interested...
Intermittently my rear brake has been seizing up. If I pump it a few times it usually let's off. Now it locks up and then won't unlock the rear brake. If I break free the sensor that's screwed into it, then the brakes release. So I'm sure the problem is what I would call the rear brake master cylinder. Has anyone had this happen? Can I rebuild it or do I have to replace the entire assembly? Part numbers? Thanks for any help.
Sounds like you have the wrong brake fluid in it...
Master cylinder part #H0205.1AA
I also have a used one if your interested...
I'll check the fluid. Brake was seized up when I bought the bike. It was somewhat abused. But it freed up then locked up a few different times. But in 4 months of driving it's only locked up 4 times but then released. Now it doesn't release. I'll take it apart and see what it looks like. And ill change the fluid. How much do you want for the used one shipped to 36305? Thanks for your help.
That's 4 times to many. Need a new one or rebuild it.
ASB has a rebuild kit. It's cheap and easy.
If u need a quick fix but by no way a proper fix take it off and squeeze the plunger of the caliper all the way in and push the pedal back out then squeeze the plunger back in...its worked on long rides for me on my KTM till I got a new one..
.also check to make sure the pedal moves freely. I powdercoated mine and forgot to clean out the inside of the hole which led to a sticky brake
i would NOT ride this thing until problem solved. you need to attend to both the caliper and the master cylinder. in essence the pads are generating heat, the heat and fluid pressure is pressing the pads against the rotor....they won't retract because the piston bores are corroded and/or the master cylinder is internally corroded and bleed-off return hole clogged. if you're not comfortable removing and checking both the m/cyl and caliper then have a pro do it. these 2 items are intricate pieces, a bit complex, and not for the amateur to work on. sounds as if both need examined and rebuilt and reinstalled with proper system bleed and Dot-4 fluid.
Right now it is released. I can't not ride it. It calls to me "ride me Tony". I just don't use the rear brake. I'll take it apart this weekend. What is the bleed hole return? Sounds like that would be the issue. I know the problem is in the master cylinder. Just not sure what's wrong with it yet.
You have poor braking technique & even poorer judgement. As lunatic says, I'd stay off the bike until you've got the brake fixed. I'd also recommend a refresher rider training course to get you reacquainted with how to brake. That rear brake is pretty essential in emergencies...I can't not ride it. It calls to me "ride me Tony". I just don't use the rear brake.
arikam: GO is one of the most knowledgeable people on this board. i concur with his opinion. riding without a rear brake is inherently dangerous. i'll reiterate: have the entire brake system gone thru. if you don't have front brake problems now you will shortly. your caliper piston is stuck in its bore from either corrosion, air, or master cyl. problem. what i said earlier.
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