?????????

 

The disk is probably warped. BTDT. Get another one and rebuild the system...~$200, more or less for pads, kits, hardware, and fluid. I bet that once you have done that, you will not have any problems for years to come.

 

If he's not moving the scooter ( as he states ) a warped rotor should have zero effect on the problem

 

Rebuild your calipers. It's sort of common on the 03/04's

 

I dunno. I had to pump mine. I rebuilt front master cylinder. I though maybe there was pitting and I needed a new one. I put new pads in, and it went away.

 

I am guilty of assuming that he was stating that his brakes were not working and that how could he know the brakes are not working if he is not moving the bike? If the disk is not warped, then I cannot even guess what would be wrong, and I would stop dicking around with it and rebuild the entire system....(I still think it is a warped disk)

 

Hopefully the OP will chime in on what resolved his problem

 

Wow, I never got any notifications on most of these posts, so sorry for the VERY late reply. I had previously rebuilt the caliper, cleaning everything out and putting in new seals. There was gunk built up, but not a whole lot. I just got around to rebuilding the master cylinder and finished that last night. The problem still exists. Right now, I am leaning towards the bent rotor. I am about to go out and see if it in fact loses pressure only when the engine is running, or if I have to move it to get it to drop. It's weird though because the rotors don't feel like they are warped or anything. There is no pulse like you would get in a car, but I guess since the rotor is a single plane it would make sense? I will let you all know.

 

Yep, it's a bent rotor. Didn't think to see if it happened with engine off and the bike moving. If you get on the brakes really hard you can feel it pulse a little bit... Oh well, the master cylinder seals had seen their better days too, so I don't feel bad about messing this one up.

 

Thankx alot ive been driving myself nuts for a wk over this very issue rebuilt master cylinder bleed brakes over nad over but the problem was a bent rotor. I never noticed cause was so slight unless you braked hard you never noticed. Thanks again for the info finally after a week i have good rear brakes again.