XT BR-M775 - serviceable?

[Once A Hero]

I've got a set of these on my Giant Anthem which is in the LBS at the moment, I hoped for a simple brake bleed of the front brake. I wanted them to do the work as I'm always getting boxes from them and spending very little. However they've told me both callipers are leaking and they aren't serviceable so need to be replaced - at quite considerable expense.

Is this correct that they can't be serviced?
If not where can I get service items?



I'm collecting the bike later as I don't have the budget for what they've quoted me to replace them

 

[wesmamyke]

Shimano does not sell seals or pistons if I recall. Search ebay or any other site and after market seal/piston kits come up. All Shimano calipers are basically interchangeable as long as they take the same hose. You can replace them whatever is cheapest if you don't care about them being XT. Some of the weirder groups cane be super cheap, like Hone or LX trekking stuff.

There was a guy with a blog/site blue liquid labs that had tried to fix leaking issues by swapping out slightly different seals and o-rings. The page is gone now from his site, although one of the pictures comes up in search.

 

[drystonepaul]

Tech docs here:
https://si.shimano.com/en/pdfs/ev/BR-M775-F-2691/EV-BR-M775-F-2691D.pdf
https://si.shimano.com/en/pdfs/ev/BR-M775-R-2764/EV-BR-M775-R-2764D.pdf

Unfortunately Shimano have never listed or supplied o-rings or service options for any of their disc brake calipers since the BR-M755 was introduced in 2000.
Very much seen as a non servicable and therefore disposable part when they start leaking.

You can get more or less any modern Shimano caliper to work with older levers though.
The BR-MT500 is a good option at less than £30 per caliper.

 

[bikeworkshop]

If you dismantle the caliper you can try to clean up the pistons then try for a match for the seals.
Customers of ours claim to have succeeded, but we wouldn't try because of the time taken and the inability to offer a guarantee on the work.

The trouble is that the pistons and bores may well be worn or damaged, so any repair could well be short lived.

 

[Once A Hero]

OK chaps thanks.
'Modern' bike stuff eh!

Already bought a new shock for the bike earlier in the year (c.£300), so I suppose a new set of XT brakes should be bought.
Appears I can get a new f&r set for £150
Way cheaper than buying a new bike I suppose!

 

[ishaw]

Possibly not far off what would be charged to bleed both brakes.

 

[Once A Hero]

Possibly not far off what would be charged to bleed both brakes.

Actually I was pleasantly surprised that the bleed quote was only £15 per brake - which I was happy to pay, just not the significant upsell...

 

[bikeworkshop]

You could get new calipers from 50, and probably same again to get them set up and bled, so a full repair would be £100.

If they were our stock id fit new calipers - we've probably got some spare flatmounts, and there are quite a few bikes flatbar/,flatmounts but little stock to suit.