Used this method on my Saint M820 lever. Disassembly was slightly different; there's a small metal pin you have to hammer out which was the hardest part for me. I first used both o-rings like you did, but the spring would not push the piston all the way out. Using just the larger o-ring allowed the piston to move properly. I've had 2 rides with this setup, about 5-6 hours total, brakes are feeling so good and no leaking so far. Thanks for the video :)
Hmmm im surprised the second o-ring affects your setup like that, its possible the plunger/piston is designed slightly different for each model, at least the main big o-ring is doing its job :) 👍 Cheers
I compress the plunger with the Allen wrench and then zip tie The other end to the handlebars really tight. Sometimes I use another behind the Allen wrench and wedge it up against the L to keep it from sliding back... That way I have two hands free. I needed to do this because my C-Clip pliers are trash and can't hold the clip strongly enough so I have to use another allen wrench to push the back half of the c-clip while compressing.😅😅😅 But it works 👍 this also works on zoom hydraulic brakes
I just bleed my right brake thinking that would be the solution for the spongie leaver action, but I realized that somehow in the leaver got air , I hope this could solve the problem 😅
Sorry this wont help your spongy feeling brakes, spongy brakes is almost always caused by air in the system so you should look into just doing the basic bleed. My friend had spongy brakes that I fixed but his problem was different, his brake like that connects to the caliper was damaged and when I pulled the brake lever I could feel that part of the brake hose expanding so you should check if maybe you got that problem as well, good luck!
I installed a m8120 2 months ago, and it leaks at the lever after I leave it for 1 month. so as you said in the video, it is a feature of Shimano's skirt seal, it can also be solved by using it more often?
I have used this setup for 2 years now on my other lever without issues, no difference in lever feel but if you use a oring that is too large it can affect the return speed of the lever because the return spring only has so much force
My m820 lever leaks air when I use the lever very slowly and it goes all the way to the handlebars without breaking unless I pull the lever fast. What should I do?
leaks air? there should be no air in the system, attach a funnel with some fluid and top off the system, if its still doing the same thing it sounds like maybe your seals on the piston are possibly worn out, I am guessing this because when you pull fast it puts enough pressure on the seal to expand and do its job, but if you go slow it wont expand enough to seal. I am not 100% sure these fit your model but I imagine they do www.aliexpress.com/item/1005002456932338.html
@@MTBfixHQ that should be the issue, I’ve already replaced the piston but the one I’ve installed was used from a brake whose lever was broken and I think the piston wasn’t new enough, thanks for the link I’ll try to get a new piston. Btw it’s a shigura mt5
Ahh this video and comment is a godsend. Really random but I have the same issue on a Zoom 876e. I suspected it's some sort of valve/rubber issue as at fast pressure it hooks up fine. I'll take it apart and have a look see. Thanks!
I have emmo oxe e bike which has missing part on both sides of brakes ...how do I know what brakes to order ...there no name or part number ? I can show you what part I'm.missing if your interested in helping me
from my experience when I tried cheap black o-rings that came in my big cheap o-ring kit they didn't last as long as these brown FKM ones I ordered, FKM shouldn't matter I think it mostly comes down to the quality of the o-ring but it is possible the FKM o-rings keep their size better in the mineral oil
@@MTBfixHQ I mostly find NBR material in my country. And I don't want to try many o-rings cause I have m820 brakes and they're pain to remove that pin if you know what I'm talking about. You believe NBR material is fine?
Shimano 9120, like the vast majority of Shimano brakes, has a servo wave system, so there are several plastic parts before the piston, which should be carefully disassembled so as not to break.
Excellent tutorial! The 9000 series levers apparently use a slightly different sized piston. You can view this user's experience here ua-cam.com/video/yoHH7qV3dIc/v-deo.html
Used this method on my Saint M820 lever. Disassembly was slightly different; there's a small metal pin you have to hammer out which was the hardest part for me. I first used both o-rings like you did, but the spring would not push the piston all the way out. Using just the larger o-ring allowed the piston to move properly. I've had 2 rides with this setup, about 5-6 hours total, brakes are feeling so good and no leaking so far. Thanks for the video :)
Hmmm im surprised the second o-ring affects your setup like that, its possible the plunger/piston is designed slightly different for each model, at least the main big o-ring is doing its job :) 👍 Cheers
Same here on M520
@@artekh9435 1 or 2 o-rings? I'm trying to solve it on my 520
@@ErnoTokesLive i used 1 o-ring, both were too tight, working for a while
Thanks @@artekh9435
Awesome video! Very helpful. Thanks!
This is really helpful! Great explanation, high production quality and organized links. Well done man!
Thanks for the kind words! I try to make it as clear as I can :)
I compress the plunger with the Allen wrench and then zip tie The other end to the handlebars really tight. Sometimes I use another behind the Allen wrench and wedge it up against the L to keep it from sliding back... That way I have two hands free. I needed to do this because my C-Clip pliers are trash and can't hold the clip strongly enough so I have to use another allen wrench to push the back half of the c-clip while compressing.😅😅😅
But it works 👍 this also works on zoom hydraulic brakes
I just bleed my right brake thinking that would be the solution for the spongie leaver action, but I realized that somehow in the leaver got air , I hope this could solve the problem 😅
Sorry this wont help your spongy feeling brakes, spongy brakes is almost always caused by air in the system so you should look into just doing the basic bleed. My friend had spongy brakes that I fixed but his problem was different, his brake like that connects to the caliper was damaged and when I pulled the brake lever I could feel that part of the brake hose expanding so you should check if maybe you got that problem as well, good luck!
I installed a m8120 2 months ago, and it leaks at the lever after I leave it for 1 month. so as you said in the video, it is a feature of Shimano's skirt seal, it can also be solved by using it more often?
Bro, how long experience do you have with that setup? Does it affect lever feel?
I have used this setup for 2 years now on my other lever without issues, no difference in lever feel but if you use a oring that is too large it can affect the return speed of the lever because the return spring only has so much force
My m820 lever leaks air when I use the lever very slowly and it goes all the way to the handlebars without breaking unless I pull the lever fast. What should I do?
leaks air? there should be no air in the system, attach a funnel with some fluid and top off the system, if its still doing the same thing it sounds like maybe your seals on the piston are possibly worn out, I am guessing this because when you pull fast it puts enough pressure on the seal to expand and do its job, but if you go slow it wont expand enough to seal. I am not 100% sure these fit your model but I imagine they do
www.aliexpress.com/item/1005002456932338.html
@@MTBfixHQ that should be the issue, I’ve already replaced the piston but the one I’ve installed was used from a brake whose lever was broken and I think the piston wasn’t new enough, thanks for the link I’ll try to get a new piston. Btw it’s a shigura mt5
Ahh this video and comment is a godsend. Really random but I have the same issue on a Zoom 876e. I suspected it's some sort of valve/rubber issue as at fast pressure it hooks up fine.
I'll take it apart and have a look see.
Thanks!
@@JLneonhug the issue was very easy to fix, take the lever piston out and change the rubber parts from the piston
Nice! Thanks for this!
Glad to help :)
I have emmo oxe e bike which has missing part on both sides of brakes ...how do I know what brakes to order ...there no name or part number ? I can show you what part I'm.missing if your interested in helping me
thanks! really helpful
You are welcome :)
This o-ring should be FKM material or it doesn't matter?
from my experience when I tried cheap black o-rings that came in my big cheap o-ring kit they didn't last as long as these brown FKM ones I ordered, FKM shouldn't matter I think it mostly comes down to the quality of the o-ring but it is possible the FKM o-rings keep their size better in the mineral oil
@@MTBfixHQ I mostly find NBR material in my country. And I don't want to try many o-rings cause I have m820 brakes and they're pain to remove that pin if you know what I'm talking about. You believe NBR material is fine?
Will this work on low end Mt 200? Great instructions!
don't bother, replace them with Deore or better
You think this will work for m6100??
yeah they use the same piston/plunger from what I see
@@MTBfixHQ could you send me a list of the tools I need for the repair?
Hey, nice work out there!
I want to try this on my m820, both are leaking oil.
Can I get you contact? I would like to get in touch with you.
Can you do this on xtr m9120?
Hi, yes it should work with all M6000-M9000 series brakes, cheers
Shimano 9120, like the vast majority of Shimano brakes, has a servo wave system, so there are several plastic parts before the piston, which should be carefully disassembled so as not to break.
Hi, would be working with SLX m675?
from my understanding it should work
mines leaking at connection of the brake hose
sometimes tightening the nut with wrench can fix the leak
Hello, will this work on a deore bl-m6100?
Hi, Yes it should use the same piston, Cheers
@@MTBfixHQThanks!
This is a Shimano XTR M9000, but I have the M9100 😅
Excellent tutorial! The 9000 series levers apparently use a slightly different sized piston. You can view this user's experience here ua-cam.com/video/yoHH7qV3dIc/v-deo.html
Thanks for letting me know! I made a mistake in my description by saying it works with m9100, I actually meant m9020, cheers
F*** that. I'm bringing my bike to a mechanic