How To Fix/Replace GY6 Scooter Master Cylinder(Disc Brakes)

Master cylinder disassembly to repair or replace a faulty piston/seals, and also show you how to bleed the brakes. My brake lever was intermittently hanging up, and no longer provided smooth operation/braking. This video shows how I solved the problem. You can either repair the master cylinder like I do in this video(if you can find parts), or buy a new master cylinder to correct your problem.
Thanks For Watching!
**If you enjoy watching my videos, please show your support by SUBSCRIBING, posting links to my videos on other websites & blogs, rating a "THUMBS UP", and watching my video playlists. Doing so will help to ensure that many more videos will be released in the future(More Demand = More Videos)**

[@loranhaworth5987]

This is a very good and instructive video. Easy to understand with great video and instruction.

[@electronicsNmore]

Glad you enjoyed the video! I have a lot of excellent videos on my channel that cover many different subjects, so be sure to check out my extensive video playlists for other videos of interest to you, rate thumbs up, and share my channel with others. Thank You

[@icfrench28]

Just what I needed, thanks!

[@electronicsNmore]

Rob Thanks for watching! Be sure to rate thumbs up, share my channel with others, and check out my extensive video playlists.

[@omkarom5868]

thank you so much, for such a esplendid video. i would like to ask you a question. can i make myself the rubber seals of this piston? i am having trouble to find them where i live in madrid.

[@electronicsNmore]

omkar om No. You need to buy them, look for another master cylinder to remove the parts from, or swap out the entire master cylinder.
Thanks For Watching!

[@d.p_oljke856]

Good bro, now i see how to repair, i broke my rear brake trigger on gy6.... now i go fix. TNX

[@electronicsNmore]

Your Welcome. Be sure to watch my other videos as well and rate Thumbs Up. Thanks!

[@5-ht2a]

this realy help,thanks.

[@electronicsNmore]

Glad to hear! Be sure to check out my GY6 video playlist and share. Thank you

[@jamest.5001]

Do you still have a scooter? Are the sliders worth the 2-3x the price of roller weights? Also I was thinking of using a dry film lube in the variator, in the roller/back plate , is that a good idea? I'm thinking about venting the cover also, the other scoot I had, I could smell the hot belt at times, for now it runs well, it does 0-25mph up grade fairly quickly, I'm expecting about 55, on flat land, it's close to where I want it, (you can only get so much from stock 139qmb cases) I am thinking about swapping to a 150cc, 157qmj, with head work, and maybe a big bore, 171cc or so, I doubt I'll get over 100mpg with it though, although a 232cc stroker would be nice, it would be hard to descuise it as a 50cc! Haha, with the big bore, and cam, it doesn't sound like a 50! It still needs carb tuning, it is running rich, I think a needle adjustment will help it.. I figured I would need larger jets, with the 20mm carb, and no stock filter box, I think 1-2 sizes smaller will do it if the needle doesn't! I think sliders with the performance moving side and ramp plate, I think it allows for more movement, ( making a larger pulley on top end) it seems sliders will push out further than the rollers! The back half of the variator is available coated for less wear of the rollers, I think a dry lube will do about the same, a Teflon or ceramic coating, or moly or carbon powder, I'll look at what others are doing, great videos!

[@electronicsNmore]

If you want, apply a VERY light coating of graphite powder for locks, on the sliders before installing them. That's what I did.

[@StephenRobinson-nov2874]

Thank you, it really helped.

[@electronicsNmore]

Great to hear! Be sure to check out my GY6 and automotive/mechanical video playlists, rate thumbs up, and share. Thanks

[@oarlimiousinetaxiservices4307]

Thanks

[@electronicsNmore]

You're welcome! Be sure to check out my "GY6" video playlist and share. Thank you

[@antonioenache5869]

Does anyone know the screw type/name for the screws on top of the master cylinder? Many thanks in advance!

[@electronicsNmore]

You can buy new screws for the master cylinder cover at any hardware store.

[@hobohacker258]

I like to use small zip ties to get o-rings/seals I wanna reuse. Less chance nicking/cutting them.

[@electronicsNmore]

Whatever works. :-) Thanks for watching!

[@76chyanne]

I have no brake handle at all thinking need new pads no resistance at handle at all

[@electronicsNmore]

76chyanne Maybe the fluid leaked out.

[@mperez5920]

Questions are from years ago, are you still available for questions?

[@electronicsNmore]

Yes, just keep them short.

[@mperez5920]

No compression after bleeding rear brake, master cylnder empty?