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Post by illwill420 on Aug 31, 2011 17:19:20 GMT -5
Okay I removed my front tire and replaced it with a new one,but now it seems my brake piston is stuck. The tire will move...I actually rode it around a bit with the new tire earlier,but the disk is rubbing really badly against the pads. I was thinking that pumping the lever would free it up but no dice. Anyone have any suggestions on freeing the damned thing so my brakes work properly again?
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Post by Premier Scooters on Aug 31, 2011 17:43:30 GMT -5
First flush your brake fluid. It is probably pretty nasty stuff in there. Then remove your brake lever and grab the end of the piston with some needle nose vice grips. Work it in and out a few times. That usually frees it up.
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Post by illwill420 on Sept 2, 2011 14:56:20 GMT -5
Okay flushing the brake fluid I get,been meaning to do that anyhow...but why would I need to remove the brake lever?
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Post by Premier Scooters on Sept 2, 2011 21:19:01 GMT -5
Removing It will let you grab the end of the piston in the master cylinder to pull it out.
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Post by illwill420 on Sept 4, 2011 10:54:03 GMT -5
Confusing,is there a piston in the master cylinder as well? The one that is stuck is the one in the brake housing,so I'm havin a hard time seeing how removing the handle will allow me access to the stuck cylinder. I've changed brake pads in cars before and I know for that you have to depress the cylinder with a c-clamp. On my old Kymco I changed a tire and didnt have this problem at all,but with this one it's def. an issue. I plan on replacing/bleeding the brake fluid on my next day off. Just tryin to get some clarity here so I dont screw anything up. Thanks
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Post by Premier Scooters on Sept 4, 2011 11:14:37 GMT -5
yes there's a piston in the master cylinder, but if that ones stuck you will will have a lot of free play in your brake lever. If that's not stuck you could try pushing the caliper piston in with a c-clamp. But first I would flush the fluid.
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Post by illwill420 on Sept 5, 2011 23:19:28 GMT -5
Yeah replacing the fluid was first order of business as when I opened the master cynander that stuff was FAR from the color of normal brake fluid. I have alot of free play in the lever but I can physically see the one in the boot stuck. Gunna spend tomorrow doing all that since I got no work or school. Thanks for the input.
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Post by fleeter on Sept 6, 2011 0:08:57 GMT -5
are you sure it's the brakes? over-tightening the axle can severely impact how freely your wheel spins.
You may need to back the nut off a little and make sure to loctite it.
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Post by illwill420 on Sept 6, 2011 10:06:15 GMT -5
110% positive its not the the axle. Actually both pistons were stuck,I freed up the one in the boot with a c-clamp but having some issues with the one in the master cyl. I think it may be jammed because even after pulling it out and pushing it in a buncha times its still slow to "bounceback" once depressed. It will move and the cylinder in the brake shoe definitely responds,but it s-l-o-w-l-y comes back out. Now is this indicative of poor brake fluid pressure (perhaps some air in the system from flushing the MC or is that thing supposed to move fairly freely?
In my Haynes scoot guide it shows how to "renew" the MC by completely removing it and taking it apart,but part of me...a major part of me,thinks I may be better served by replacing the master cylinder completely.
Any input?
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Post by fleeter on Sept 6, 2011 11:09:32 GMT -5
good to know you at least found the culprit... unfortunately I've never done anything with the MC... we'll have to wait for someone with a little more experience in that field.
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Post by illwill420 on Sept 7, 2011 9:47:06 GMT -5
Well so far no answers,but the master cylinder for my scoot is only 44.00 new so it dont seem like a real expensive thing to do. Much less stress than taking it apart and possibly losing crucial pieces.
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Post by illwill420 on Sept 24, 2011 17:20:28 GMT -5
For those who were following along at home,I did buy a new master cylinder for 44 bux and replaced it,and now I can pretty much stop on a dime,and honestly the replacement took me about an hour and that was including me riding up the road for about 15 mins...so total ab out 45 mins replacing and then bleeding the system. The longest part was bleeding the cylinder, I had air bubbles coming up what seemed like forever. Bleeding the caliper was only tedious because I kept having to bend around to check the hose and pump the brake.
All said and done,44.00 for the new MC,5 bux for a bottle of DOT4 and about 45 minutes to fully replace and bleed. Not a bad repair at all.
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Post by larsliederhausen on Sept 16, 2012 15:36:11 GMT -5
Hello, I'm new to the scooter world and I believe i may have had the same problem. I lost pressure in my front brake lever. Then I noticed my brakes were stuck on the rotor and I had a slight leak where the brass bolt connects to the brake assembly. I put teflon tape around the threads of that bolt and tightened it up to the o-ring. I filled the reservoir up top and worked the hose until all air bubbles are out. I got good pressure in the lever now but....the piston that moves the brake pad onto the rotor..WILL NOT RETRACT. Is this the same problem you had or was your different. I cant figure out how to get the piston to retract. Please help.
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