XT brake failures

[Patrick Green]

My wife and I have experienced rear brake master cylinder (hand lever) failures. Angela's XT (8000) twice in about 3000km where the cylinder weeps and needed bleeding regularly.

As they cannot be overhauled or serviced, they have been replaced at huge expense.

 My 8100 XT have not even done a 1000km, and there's sign of leakage from the same place. 

 

As a comparison, my 2006 Anthem's XT brake set are still fully functional, and have never given a day's trouble.

 

Anyone else?

[Me rida my bicycle]

Yip for some reason it's always XT. 

My 785 and 8000 had issues but SLX and Deore levers have never given problems must be that stupid adjuster screw (that doesn't do anything anyway) 😁. 

I replaced my 8000 levers with the latest Deore and they feel so much better. 

 

[cadenceblur]

Same issue on my front. I used to hang my bike from front wheel, can no longer do this. 

M8000 version.

[Chadvdw67]

@thebob

[thebob]

My master cylinders are fine, pistons not so much. Also, Aliexpress has full rebuild kits available for the master cylinders and calipers

Edited August 25, 2022 by thebob

[MTBRIDER1234]

19 minutes ago, thebob said:

My master cylinders are fine, pistons not so much. Also, Aliexpress has full rebuild kits available for the master cylinders and calipers

I know a guy who has used the aliexpress titanium pistons kits many times. He swears by them for guides and shitmanos. They cost next to nothing, so they are definitely worth a try for sure.

[Patrick Green]

41 minutes ago, thebob said:

My master cylinders are fine, pistons not so much. Also, Aliexpress has full rebuild kits available for the master cylinders and calipers

Do you have a link?

 

 

[RobertWhitehead]

Yes, you can service them, but why would you as a supplier of the product provide service kits if you can force the market to buy new?

it is actually quite a simple exercise to get right. One can even attempt a DIY 🤪

Edited August 25, 2022 by RobertWhitehead
Added more

[Patrick Green]

Just now, RobertWhitehead said:

Yes, you can service them, it is actually quite a simple exercise to get right. One can even attempt a DIY 🤪

I used to be a motor mechanic and overhauled many tandem brake master cylinders 

[RobertWhitehead]

2 minutes ago, Patrick Green said:

Do you have a link?

 

 

I am placing an order with them within the next week or so, I can add some for you, no worries. Here's the link to what I am going to order: 

https://www.aliexpress.com/item/32973287602.html?spm=a2g0o.productlist.0.0.242d472eGSOx4A&algo_pvid=f2734565-057d-4d6f-980a-85c76985d581&algo_exp_id=f2734565-057d-4d6f-980a-85c76985d581-17&pdp_ext_f={"sku_id"%3A"12000020910060902"}&pdp_npi=2%40dis!ZAR!136.5!0.17!!!36.21!!%40210318cf16614087688272613e275a!12000020910060902!sea&curPageLogUid=SUZltt2mcWmX

Just bear in mind that the delivery will take a couple of months to reach our shores

[Patrick Green]

8 minutes ago, RobertWhitehead said:

I am placing an order with them within the next week or so, I can add some for you, no worries. Here's the link to what I am going to order: 

https://www.aliexpress.com/item/32973287602.html?spm=a2g0o.productlist.0.0.242d472eGSOx4A&algo_pvid=f2734565-057d-4d6f-980a-85c76985d581&algo_exp_id=f2734565-057d-4d6f-980a-85c76985d581-17&pdp_ext_f={"sku_id"%3A"12000020910060902"}&pdp_npi=2%40dis!ZAR!136.5!0.17!!!36.21!!%40210318cf16614087688272613e275a!12000020910060902!sea&curPageLogUid=SUZltt2mcWmX

Just bear in mind that the delivery will take a couple of months to reach our shores

I used red rubber grease to assemble all DOT4 brake fluid cylinders. I wonder if its compatible with mineral oil?

 

 

[lechatnoir]

17 minutes ago, RobertWhitehead said:

I am placing an order with them within the next week or so, I can add some for you, no worries. Here's the link to what I am going to order: 

https://www.aliexpress.com/item/32973287602.html?spm=a2g0o.productlist.0.0.242d472eGSOx4A&algo_pvid=f2734565-057d-4d6f-980a-85c76985d581&algo_exp_id=f2734565-057d-4d6f-980a-85c76985d581-17&pdp_ext_f={"sku_id"%3A"12000020910060902"}&pdp_npi=2%40dis!ZAR!136.5!0.17!!!36.21!!%40210318cf16614087688272613e275a!12000020910060902!sea&curPageLogUid=SUZltt2mcWmX

Just bear in mind that the delivery will take a couple of months to reach our shores

use aramex global shopper as a shipping forwarder?

[thebob]

New caliper pistons:

Heppe Bike Hydraulic Brake Caliper Ceramic Piston Mtb Road Bike Disc Brake Piston For M640 M810 M820 M7120 M8120 M9120 4-piston - Bicycle Brake - AliExpress

Master cylinder rebuild parts:

Slx M7100 Xt M8100 Hydraulic Brake Handle Repair Accessories Diaphragm Piston Spring Oil Seal Screw Brake Handle Parts - Bicycle Brake - AliExpress

Edited August 25, 2022 by thebob

[Chadvdw67]

3 hours ago, MTBRIDER1234 said:

I know a guy who has used the aliexpress titanium pistons kits many times. He swears by them for guides and shitmanos. They cost next to nothing, so they are definitely worth a try for sure.

I made my own pistons from ally when I had guide brakes, super simple things to make

[dasilvarsa]

She Man Ho Brakes do not like you to store bike where the caliper is higher than the lever, like upside down or hanging from a wheel. Even a short Time is enough for bleeding problems.