Page 1 of 4 1 2 3 4 LastLast
Results 1 to 25 of 79
  1. #1
    GL1
    GL1 is offline
    mtbr member
    Reputation:
    Join Date
    Mar 2007
    Posts
    362

    XT-XTR BR-M785 Warranty Brake Leaking Issue

    Hi All,

    So I thought I'd post as a Public Service Announcement.

    I have the new design 2011 XT Trail Brakes. First and foremost, let me just say they are the BEST brakes I've ever ridden hands down. So, don't let this post deter you from purchasing a truly great product at what I think is a good value.

    But, after wrestling with an issue on my front brake for a few weeks and consulting with one of the best LBS's here in CO I finally have an answer.

    It appears that LBS's are beginning to see a common leakage issue with these brakes in the factory lines. The leak takes place right above the banjo nut where the fitting intersects the line itself (left side of the caliper) and trace amounts of mineral oil get down onto the pads/rotor. Apparently this is becoming "known" so check yours if you're having issues. I am getting a new hose warranty etc... I'll explain more below.

    As far as symtoms, I had a noticeable loss of power (because oil was on the pads/rotors). It was even to the point of my being able to push the bike with the front brake on hard. But, this went away if I used them on an extended downhill because it burned the oil off and then the power would increase again. You can also have howling and noise although I didn't have too much of that. The giveaway is that if you ride in dusty conditions like I do, you will see the dirt gather on the oil all over the caliper. Compared to my rear brake (that does not yet have this issue) it was easy to see the difference. Of course the final thing is that you will get some air in your line which I also notices when I tipped the bike upside down or on the back wheel and back down (the lever went nearly to the grip but "pumped" up again once the bike was again level.

    So anyway, I think I saw a post on this awhile back. I'd be interested to hear if others have had this issue. Again, I think the brakes themselves are OUTSTANDING and for me, Shimano is standing by this and giving me new lines etc. I am assuming the LBS will also get reimbursed for the subsequent bleed oil/labor from Shimano as well. The only component I'm not sure on is the pads. They did get mineral oil on them and I have heard that can damage them. We will see what happens but at $45 a pop I wouldn't mind a warranty pair of those as well.

    Let me know if you have had or heard of this issue as well.

  2. #2
    mtbr member
    Reputation:
    Join Date
    Nov 2005
    Posts
    310
    Helpful post thank you, I guess the next question is whether Shimano has redesigned the hose and if Jagwire or others offer a good aftermarket alternative

  3. #3
    GL1
    GL1 is offline
    mtbr member
    Reputation:
    Join Date
    Mar 2007
    Posts
    362
    Quote Originally Posted by baltik View Post
    Helpful post thank you, I guess the next question is whether Shimano has redesigned the hose and if Jagwire or others offer a good aftermarket alternative
    Yeah, I hope whatever they give me for a warranty is a redesigned one. I just saw another post on these and this banjo nut leak issue has been experienced by others on the XT's and XTR's. I'll have to watch my rear one as well.

    The jagwire has mixed reviews but it does come in an array of colors. I don't know if they have a different banjo nut that comes with them and/or whether that would be better. The Shimano hose itself seems to get good reviews less this banjo bolt leakage issue.

    I would be interested to know whether anyone makes stainless braided cables for these. If so they would probably be $$$. A quick search found one UK company...HEL Performance Mountain Bike Brake Line Kits

  4. #4
    mtbr member
    Reputation:
    Join Date
    May 2009
    Posts
    108
    The same thing happened to me. Both front and rear were leaking where the hose went into the fitting. My LBS quick fix was to heat up the pads, scuff the rotors and crazy glue the line at the leek to keep them from seeping and saturating the pads again. Here is my problem...they tell me Shimano refuses to believe there is a problem with the brakes. So now I have $400 worth of brakes that make noise, dont stop worth a damn and need hoses and pads replaced. Its been a week on Friday, gonna call them tomorrow and see whats up. If not, then Shimano gets the call from me.

  5. #5
    GL1
    GL1 is offline
    mtbr member
    Reputation:
    Join Date
    Mar 2007
    Posts
    362
    Quote Originally Posted by JayMac View Post
    The same thing happened to me. Both front and rear were leaking where the hose went into the fitting. My LBS quick fix was to heat up the pads, scuff the rotors and crazy glue the line at the leek to keep them from seeping and saturating the pads again. Here is my problem...they tell me Shimano refuses to believe there is a problem with the brakes. So now I have $400 worth of brakes that make noise, dont stop worth a damn and need hoses and pads replaced. Its been a week on Friday, gonna call them tomorrow and see whats up. If not, then Shimano gets the call from me.
    Well, keep on it for sure and let your LBS call the reps. It sounded to me from my LBS guys that Shimano is beginning to acknowledge the problem and it sounds legitimate based on what you see on other threads on this forum.

    I also thought about some ways to do a "quick fix" but apparently they are getting my warranty line in a few days. I can still ride on mine and it actually works good on long DH's when the rotors get hot and the mineral oil burns off. Mine is not leaking like crazy either...but enough.

    Anyway, despite all this I still have to say that they are awesome brakes. Shimano may just need to address this issue and make it right. Funny how the smallest link (banjo nut fitting) can mess with an otherwise amazing system.

  6. #6
    mtbr member
    Reputation:
    Join Date
    Jun 2009
    Posts
    144
    As stated, this is a known issue at shimano and if the dealer calls them they will send out a replacement, provided you send in your leaking one. I called our rep and got it all taken care of, including pads. The hose and fitting look exactly the same, i was told it was an issue with the crimping machine using not enough force and all has been remedied now.

  7. #7
    mtbr member
    Reputation:
    Join Date
    Jan 2004
    Posts
    360
    My rear M785 brake started leaking at the banjo / hose junction. I bought mine from treefort bikes, they got me a RA# and I sent it back to Shimano. I asked if I could just send in the line since the lever and caliper were fine, but I had to send in the whole thing. My replacement is on its way to me in the mail. No issues with my front brake (knock on wood), but I'll be watching the hose like a hawk.

  8. #8
    mtbr member
    Reputation:
    Join Date
    Jan 2004
    Posts
    360
    Quote Originally Posted by avbcon12 View Post
    As stated, this is a known issue at shimano and if the dealer calls them they will send out a replacement, provided you send in your leaking one. I called our rep and got it all taken care of, including pads. The hose and fitting look exactly the same, i was told it was an issue with the crimping machine using not enough force and all has been remedied now.
    Everyone knows when it comes to ho(ses) that crimpin' ain't easy...

  9. #9
    74 & 29 pilot
    Reputation: MTB Pilot's Avatar
    Join Date
    Oct 2010
    Posts
    1,968
    Quote Originally Posted by JayMac View Post
    The same thing happened to me. Both front and rear were leaking where the hose went into the fitting. My LBS quick fix was to heat up the pads, scuff the rotors and crazy glue the line at the leek to keep them from seeping and saturating the pads again. Here is my problem...they tell me Shimano refuses to believe there is a problem with the brakes. So now I have $400 worth of brakes that make noise, dont stop worth a damn and need hoses and pads replaced. Its been a week on Friday, gonna call them tomorrow and see whats up. If not, then Shimano gets the call from me.
    WOW!! Your LBS SUCKS!! I'd be on the phone with Shimano yesterday.

    I just had this issue on Saturday with my rear brake and it pissed all the oil out during the last 3-4 miles of my ride. Luckily I have two sets and was able to use one off another bike, but my LBS called Shimano and got a new hose and pads coming under warranty. Shimano knows about the issue, and doesn't have a problem doing the right thing. \\ Wonderful brakes otherwise!!

    MTBP
    Attached Thumbnails Attached Thumbnails XT-XTR BR-M785 Warranty Brake Leaking Issue-img_0655.jpg  

    MTBP
    "GIVE ME LIBERTY OR GIVE ME DEATH!"
    Turn on the truth: http://www.ronpaulchannel.com/

  10. #10
    mtbr member
    Reputation:
    Join Date
    Jan 2011
    Posts
    29
    Have the same problem with both m XTR brakes. Thank you very much for the info!

  11. #11
    mtbr member
    Reputation:
    Join Date
    Jan 2011
    Posts
    87
    My M775's leaked at the front outside piston.

    Shimano replaced with M785's.

  12. #12
    GL1
    GL1 is offline
    mtbr member
    Reputation:
    Join Date
    Mar 2007
    Posts
    362

    Good job! Follow Up

    Wanted to post a follow up on my warranty issue.

    So Shimano is sending me a new line, new pads, and apparently a new ICE tech rotor! Oh, and taking care of the labor I believe as well but not 100% sure on that yet.

    My LBS really came through for me and Shimano apparently agrees that once a brake has this issue and mineral oil gets on the pads and rotor, all those components need to be replaced. So, that was a nice surprise. I didn't know the rotor was included...and it was an ICE Tech at that...so between that and the pads there's some $$$ there in this warranty.

    Anyway, everything is on it's way so hopefully I'll get this resolved in the next week or so. Since this causes such an issue when the failure occurs I am thinking about proactively changing the rear brake line...or maybe I'll just wait and see if it develops an issue and then take it in for warranty as well IF that happens. I haven't decided yet.

    Anyway, a kudos to my LBS, Wheat Ridge Cyclery in CO here for taking care of me like they always do. Support your LBS. I don't buy everything at the LBS due to lower prices online but I do make an honest attempt to give them business in both service and parts...even sometimes when it's a few bucks more. Also, thanks to Shimano for making things right and standing behind their product.

    And as I've said along and will continue to say...even after this these are the BEST brakes I have ever ridden!

  13. #13
    mtbr member
    Reputation:
    Join Date
    Jan 2004
    Posts
    360
    I just got my new warranty replacement rear brakeset from Treefort. I mounted it up, and everything's looking good after a few rides, no sign of leakage at the banjo. I noticed that the crimp lines on the new brake line look more defined than the ones on my front brake line. I'll be keeping a very close eye on both banjo fittings.

  14. #14
    mtbr member
    Reputation:
    Join Date
    Aug 2010
    Posts
    1,378
    I'm having a lot of the same symptoms with a rear XT brake. It has been squealing and has a loss of power. After storing the bike upside down for a few days, the lever would bottom out on the handlebars, but then pumped back up after many pumps. I'll have to take a closer look at the banjo fitting and see if the there is leakage there.

    Has anyone called Shimano directly instead of working through a dealer?

  15. #15
    mtbr member
    Reputation:
    Join Date
    May 2012
    Posts
    35
    Just fitted these myself,but as id started seeing reports on different forums regarding the hose leaks I bought the components seperately and opted to fit Jagwire Hy-Flow lines instead. But I had leakage from the lever end as Jagwires supplied Olives werent holding the hose correctly,my LBS corrected this and I think that they used the Shimano olives on the Jagwire hose,so far no leaks and great braking.

  16. #16
    Lightly salted
    Reputation: fuenstock's Avatar
    Join Date
    May 2006
    Posts
    1,210
    I've also been running Jagwire hi flow hose on my front and rear xtr trail brakes for several months with out issue. Great brakes now that they are working right. Both my front and rear shimano hose's leaked right form the start.

  17. #17
    GL1
    GL1 is offline
    mtbr member
    Reputation:
    Join Date
    Mar 2007
    Posts
    362

    Still waiting..

    I'm still waiting for my parts from Shimano...hopefully next week.

    In the mean time, I put super glue around the banjo nut...seems to help. Temporary fix.

    See pic...
    Attached Thumbnails Attached Thumbnails XT-XTR BR-M785 Warranty Brake Leaking Issue-img_0575.jpg  


  18. #18
    GL1
    GL1 is offline
    mtbr member
    Reputation:
    Join Date
    Mar 2007
    Posts
    362

    Yep

    Quote Originally Posted by jabrabu View Post
    I'm having a lot of the same symptoms with a rear XT brake. It has been squealing and has a loss of power. After storing the bike upside down for a few days, the lever would bottom out on the handlebars, but then pumped back up after many pumps. I'll have to take a closer look at the banjo fitting and see if the there is leakage there.

    Has anyone called Shimano directly instead of working through a dealer?
    Sounds like a classic case of this and you've got air in the line for sure now if your lever is doing that. You can ride it but it's not great. Check that banjo nut. It's a slight leak...more like a seep but typically if you have a thin layer dust on the caliper and lines you can see it.
    Last edited by GL1; 05-12-2012 at 10:34 AM. Reason: misspell

  19. #19
    mtbr member
    Reputation:
    Join Date
    Feb 2010
    Posts
    788
    awe...man. I want to get a set of these but is worth the hassle.....?

  20. #20
    mtbr member
    Reputation:
    Join Date
    Jun 2009
    Posts
    144
    Quote Originally Posted by big JC View Post
    awe...man. I want to get a set of these but is worth the hassle.....?
    There really isnt any hassle, not everyone is having this issue and if you do shimano fixes it.


  21. #21
    mtbr member
    Reputation: rgeniec's Avatar
    Join Date
    Feb 2007
    Posts
    199
    Same issue with me on front and rear. The front drips onto rotor. The rear still leaks but drips on the underside of the caliper and has not infected the pads yet. I see a dust sludge trail like the front. Getting both replaced under warranty hopefully. I will let u know the results soon.

  22. #22
    Hello
    Reputation: charlesinoc's Avatar
    Join Date
    May 2009
    Posts
    307
    How do I request for warranty repair if you did a self install? Anyone have an experience.

    Thank you for posting this information, very helpful.

    sent from my rotary phone

  23. #23
    007
    007 is offline
    b a n n e d
    Reputation: 007's Avatar
    Join Date
    Jun 2005
    Posts
    5,283
    Has anyone tried retrofitting the new XT/XTR's with braided lines?
    Alcohol may lead nowhere, but it sure is the scenic route!

  24. #24
    g3h6o3
    Reputation: PissedOffCil's Avatar
    Join Date
    Oct 2007
    Posts
    3,708
    Ended up having the leaking front hose, I epoxied it because I have a race this weekend. I might end up replacing it in the long run for Jagwire Hyflow or Goodridge lines since I doubt Shimano will replace the brakes since I bought them over Ebay. I also have a leak of my rear brake but at the lever this time... I wonder if the seals might have been damaged when riding in freezing temps this winter. Anyhow, bad situation before a race! At least they stop enough for me to race this weekend.
    Check out my SportTracks plugins for some training aid software.

  25. #25
    Lightly salted
    Reputation: fuenstock's Avatar
    Join Date
    May 2006
    Posts
    1,210
    Quote Originally Posted by PissedOffCil View Post
    I might end up replacing it in the long run for Jagwire Hyflow or Goodridge lines since I doubt Shimano will replace the brakes since I bought them over Ebay..
    I replaced my front and rear leaking shimano hose with Jagwire hyflow and has been leak free since. I didn't want to try shimano hose again because I had heard of people getting replacment shimano hose and have it leak again. Heres a picture of the jagwire hyflow setup.


Page 1 of 4 1 2 3 4 LastLast

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •