Tech Q&A

Fix/Workaround: Shimano XT M785 Brake Lever

Thiago Zanella's Photo Thiago Zanella 23 Oct 2018

I got it, I was missing the position of the spring, it's over the lever. Now it's pouring oil and twisting so I have not screwed much.

ChrisF's Photo ChrisF 10 Dec 2018

thanks

Moridin's Photo Moridin 08 Apr 2019

Hi

 

I am misusing this old thread for my problem. I sometimes have pressure when pulling the lever, and sometimes not. Found it impossible to bleed the brakes. I checked for leaks, and have none.

 

What could be the issue?

Captain Fastbastard Mayhem's Photo Captain Fastbastard Mayhem 08 Apr 2019

air in the system

Moridin's Photo Moridin 08 Apr 2019

air in the system

 

Already tried bleeding. It just never develops resistance at the lever. I have bled Shimano brakes many times before, but this time I am not coming right. Which makes me thinks the seals are stuffed.


Edited by Moridin, 08 April 2019 - 11:47 .

Captain Fastbastard Mayhem's Photo Captain Fastbastard Mayhem 08 Apr 2019

yeah, that's another possibility. 

Me rida my bicycle's Photo Me rida my bicycle 08 Apr 2019

Already tried bleeding. It just never develops resistance at the lever. I have bled Shimano brakes many times before, but this time I am not coming right. Which makes me thinks the seals are stuffed.

sounds like lever is stuffed. Had the same issue last week if it's the left side I have a lever for you. Inbox me if interested.

Moridin's Photo Moridin 08 Apr 2019

sounds like lever is stuffed. Had the same issue last week if it's the left side I have a lever for you. Inbox me if interested.

 

Right side, for the rear brake. But thanks for the offer.

milky4130's Photo milky4130 08 Apr 2019

Right side, for the rear brake. But thanks for the offer.

I find rear brakes is very difficult to do especially when you are doing it on your own. Definitely sounds like you are not getting the air all out.

Moridin's Photo Moridin 09 Apr 2019

Shimano can go screw themselves.

 

So I can't get the right hand lever separately. I can't even get just the rear brake assembly separately. I have to buy a whole new brake set because the seals on the piston has gone bad.

 

They just lost me as customer.

 

This is just part of the whole cycling industry raping their customers.

milky4130's Photo milky4130 09 Apr 2019

Shimano can go screw themselves.

 

So I can't get the right hand lever separately. I can't even get just the rear brake assembly separately. I have to buy a whole new brake set because the seals on the piston has gone bad.

 

They just lost me as customer.

 

This is just part of the whole cycling industry raping their customers.

if you are sure its the seal on the piston then you can take the piston from the left hand lever as offered above by another hubber.

Moridin's Photo Moridin 09 Apr 2019

if you are sure its the seal on the piston then you can take the piston from the left hand lever as offered above by another hubber.

 

If i did not break one small part like a muppet when taking it apart, I would have taken him up on his offer. It's that one small part that retains the piston in the sleeve. And yes, it is different between leftie and rightie. It is very fragile and the twisting of the one part with pliers did it.

Meezo's Photo Meezo 09 Apr 2019

If i did not break one small part like a muppet when taking it apart, I would have taken him up on his offer. It's that one small part that retains the piston in the sleeve. And yes, it is different between leftie and rightie. It is very fragile and the twisting of the one part with pliers did it.


I owe you, i might have spare levers, how urgent is it?

Its seems you ok with opening them up? So i could give them to you, to open and use the spares

Moridin's Photo Moridin 09 Apr 2019

I owe you, i might have spare levers, how urgent is it?

Its seems you ok with opening them up? So i could give them to you, to open and use the spares

 

Not very urgent. Ja, no problem opening them up. I know now the trick to opening them up.

Meezo's Photo Meezo 09 Apr 2019

Not very urgent. Ja, no problem opening them up. I know now the trick to opening them up.


I'll scratch out those levers and let you know

milky4130's Photo milky4130 10 Apr 2019

If i did not break one small part like a muppet when taking it apart, I would have taken him up on his offer. It's that one small part that retains the piston in the sleeve. And yes, it is different between leftie and rightie. It is very fragile and the twisting of the one part with pliers did it.

Which part exactly? This one? 

xt 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%