Tech Q&A

Fix/Workaround: Shimano XT M785 Brake Lever

Moridin's Photo Moridin 11 Apr 2019

Which part exactly? This one? 

attachicon.gifxt brake part.JPG

 

if so i also broke this when removing it the 1st time but just assembled it exactly the same way & more than a year later it still works 100% 

 

 No, the small part just below SALE in the following pic.

 

brake-parts.jpg

MrJacques's Photo MrJacques 11 Apr 2019

No chance of 3d printing it?

Captain Fastbastard Mayhem's Photo Captain Fastbastard Mayhem 11 Apr 2019

 No, the small part just below SALE in the following pic.

 

attachicon.gifbrake-parts.jpg

All I see is a pic taken by a potato

Meezo's Photo Meezo 11 Apr 2019

All I see is a pic taken by a potato


My bad, it was dark and lonely

milky4130's Photo milky4130 11 Apr 2019

No, the small part just below SALE in the following pic.

brake-parts.jpg

ah ok good luck then.

Moridin's Photo Moridin 11 Apr 2019

BTW, if I was to say stuff it all and want to buy Hope brakes, which model would you suggest?

CharldT's Photo CharldT 03 Dec 2019

Reviving an old thread here.

 

Stripped out mate's stuck down M7000 SLX lever last night and found that the piston/plunger head is mushroomed. And seems that my M785 XTs isn't far from reaching that point also.

 

Found these kits on Ali Xpress. Works out to about R190 with shipping if anyone want to attempt to rebuild/revive their lever.

 

https://www.aliexpre....3c344c4d9QAbRL

 

Lead time sux a bit, but will provide feedback on these and the rebuild process if and when they arrive one day

Captain Fastbastard Mayhem's Photo Captain Fastbastard Mayhem 03 Dec 2019

BTW, if I was to say stuff it all and want to buy Hope brakes, which model would you suggest?

For you, race lever, X2 caliper. More than enough power and it's a slightly smaller package.  

 

EDIT: Yes, I know it's like 8 months later and all. 


Edited by Captain Fastbastard Mayhem, 03 December 2019 - 10:38 .

babse's Photo babse 03 Dec 2019

 

 

Found these kits on Ali Xpress. Works out to about R190 with shipping if anyone want to attempt to rebuild/revive their lever.

 

https://www.aliexpre....3c344c4d9QAbRL

 

Lead time sux a bit, but will provide feedback on these and the rebuild process if and when they arrive one day

wonder if this will work in an XTR m9000 lever!?

 

current internals doesnt last for s***t

CharldT's Photo CharldT 03 Dec 2019

wonder if this will work in an XTR m9000 lever!?

 

current internals doesnt last for s***t

according to the comment listed in the product reviews, there are people that used these successfully rebuilt their XTR's with these

Meezo's Photo Meezo 03 Dec 2019

wonder if this will work in an XTR m9000 lever!?

current internals doesnt last for s***t


The feeling on your lever is not the piston getting stuck but rather the lever losing bite, i think the plausible explanation is the bore of the cylinder is phucked. This could be caused by bad maintenance and weight savings in the xtr lever

Meezo's Photo Meezo 03 Dec 2019

Reviving an old thread here.

Stripped out mate's stuck down M7000 SLX lever last night and found that the piston/plunger head is mushroomed. And seems that my M785 XTs isn't far from reaching that point also.

Found these kits on Ali Xpress. Works out to about R190 with shipping if anyone want to attempt to rebuild/revive their lever.

https://www.aliexpre....3c344c4d9QAbRL

Lead time sux a bit, but will provide feedback on these and the rebuild process if and when they arrive one day


Been running those in my Guides.

Work well. Busy reviving another set of guides now, but the internal circlip pliers i order was damaged and CCS don't seem to list them on their site. Time for the dremel

babse's Photo babse 03 Dec 2019

The feeling on your lever is not the piston getting stuck but rather the lever losing bite, i think the plausible explanation is the bore of the cylinder is phucked. This could be caused by bad maintenance and weight savings in the xtr lever

yeah probs...

 

solution = bin them and get XT M8100  :whistling:

droo's Photo droo 03 Dec 2019

The feeling on your lever is not the piston getting stuck but rather the lever losing bite, i think the plausible explanation is the bore of the cylinder is phucked. This could be caused by bad maintenance and weight savings in the xtr lever

 

Lever biting, but then getting closer to the bar under pressure?

 

More likely a worn or damaged seal than lever bore.

 

Strip and check if you've got a bit of time off the bike.

fcwailei@gmail.com's Photo fcwailei@gmail.com 18 Mar 2020

Hi, I'm encountering the same issue on my m785 fron lever is more affected then the rear one.

 

Can someone please tell me the material of the piston inside the master cylinder?  is it from plastic/composite or metal?

 

I'm asking this because on aliexpress i can see that the same seller is selling aprons(rubber o-rings) separately and he is also selling a metal piston together with the o-rings.

 

https://bit.ly/2IYe5eo

 

https://www.aliexpre....3c344c4d9QAbRL

 

And don't know which version is better to buy.

 

Apparently , if the original piston is from plastic, it seems a better idea to buy the whole metal piston, but don't know how will this impact the entire system.

 

Let me know you're thoughts.

Meezo's Photo Meezo 18 Mar 2020

Hi, I'm encountering the same issue on my m785 fron lever is more affected then the rear one.

Can someone please tell me the material of the piston inside the master cylinder? is it from plastic/composite or metal?

I'm asking this because on aliexpress i can see that the same seller is selling aprons(rubber o-rings) separately and he is also selling a metal piston together with the o-rings.

https://bit.ly/2IYe5eo

https://www.aliexpre....3c344c4d9QAbRL

And don't know which version is better to buy.

Apparently , if the original piston is from plastic, it seems a better idea to buy the whole metal piston, but don't know how will this impact the entire system.

Let me know you're thoughts.


It's plastic

I ordered titanium pistons I'm going to fit on my guides.