NickGM Posted January 11, 2017 Share I was wondering if anyone else has experienced this issue. I have some sram guide brakes which I've had really good service from for the last year now. However in the last few weeks I've noticed that, if I ride anywhere and the temp is in the mid 30s, the one brake lever (rear) very quickly becomes very "sticky" in that it does not return back to its original position quickly and the pistons have pushed out to the point where the pads are now grabbing the disc (braking, in other words). But if I go for a ride in cooler weather - not a problem. So my first guess is that there is a bit of air in the system. Air expands faster/more than hydraulic fluid so may push the pistons out and may contribute to the sticky feel of the lever. So I will give them a bleed just as soon as I get my hands on some Dot fluid. But....I have done a bit of digging and found this disappointingly common issue:http://forums.mtbr.com/brake-time/guide-rs-levers-not-returning-replaced-under-warranty-1011229.html Many of the thread's comments echo the exact same sentiment - the levers get sticky once the outside temp gets a bit warm. So if anyone has had similar experiences and solutions - please let me know. And just to pre-empt, "Buy some shimano brakes" is not really a solution yet. I've always been a shimano guy but the guides were part of a very well priced build. Link to comment Share on other sites More sharing options...
Meezo Posted January 11, 2017 Share check out thread with XT brakes doing the same, my suggestion is probably a very good clean and rebleed and see if its the same, otherwise this might give you some kind of idea https://community.bikehub.co.za/topic/155987-fixworkaround-shimano-xt-m785-brake-lever/ Captain Fastbastard Mayhem and NickGM 2 Link to comment Share on other sites More sharing options...
ALLMTB Posted January 11, 2017 Share Yip, I know of three people who have had the exact same issue. Two of them on the same day...Guide RS and RSC. The brakes work flawlessly until you spend some time outside in 30 degree plus heat. In all cases the brakes were replaced under warranty. Captain Fastbastard Mayhem 1 Link to comment Share on other sites More sharing options...
NickGM Posted January 11, 2017 Share check out thread with XT brakes doing the same, my suggestion is probably a very good clean and rebleed and see if its the same, otherwise this might give you some kind of idea https://community.bikehub.co.za/topic/155987-fixworkaround-shimano-xt-m785-brake-lever/Thanks! that's thorough. I'll give it a read this evening. Link to comment Share on other sites More sharing options...
Captain Fastbastard Mayhem Posted January 11, 2017 Share Yeah, agree with Meez. Sounds like it's an air problem coupled with maybe gummy pistons. Link to comment Share on other sites More sharing options...
stefmeister Posted January 11, 2017 Share Mine (RS) did this as well, bleeding etc didn't fix it.Had them replaced under warranty as it's apparently a well known issue due to the piston expanding and getting stuck. Link to comment Share on other sites More sharing options...
Chavo Posted January 11, 2017 Share I've experienced this exact same thing and also only with the rear brake. I bled and cleaned the brakes only a couple months back and haven't done that much riding since to suggest they need a rebleed and clean. Nonetheless I had planned to do this and see what the outcome is. But from what Stefmeister says it may be pointless... Link to comment Share on other sites More sharing options...
NickGM Posted January 11, 2017 Share I've experienced this exact same thing and also only with the rear brake. I bled and cleaned the brakes only a couple months back and haven't done that much riding since to suggest they need a rebleed and clean. Nonetheless I had planned to do this and see what the outcome is. But from what Stefmeister says it may be pointless...OK well if you do find the issue coming up again, get in touch with Cape Cycle Systems as they deal with Sram warranties. I suspect if a bleed didn't fix it then you have the same (now well known) issue. Chavo 1 Link to comment Share on other sites More sharing options...
RiverInTheRoad Posted January 11, 2017 Share Classic SRAM.... Link to comment Share on other sites More sharing options...
droo Posted January 11, 2017 Share Yup. Got 3 sets in the shop this week for the same issue. The tolerance between the piston and the lever bore somehow goes for a loop when the lever gets too hot and the piston jams. Lever rebuild should sort it out, otherwise we've successfully modded a set by skimming about 0.1mm off the piston bushes before reinstalling. NickGM and Meezo 2 Link to comment Share on other sites More sharing options...
Meezo Posted January 11, 2017 Share Yup. Got 3 sets in the shop this week for the same issue. The tolerance between the piston and the lever bore somehow goes for a loop when the lever gets too hot and the piston jams. Lever rebuild should sort it out, otherwise we've successfully modded a set by skimming about 0.1mm off the piston bushes before reinstalling. coming from a shimano brake fan, this is the nice thing about sram brakes, it can be rebuilt as for shimano the McGuyver fix can/should work! unrelated to this thread, droo where is the new lab? bikehub not doing a review on the new store, Nils says you closer by to us now Donovan Le Cok 1 Link to comment Share on other sites More sharing options...
Captain Fastbastard Mayhem Posted January 11, 2017 Share coming from a shimano brake fan, this is the nice thing about sram brakes, it can be rebuilt as for shimano the McGuyver fix can/should work! unrelated to this thread, droo where is the new lab? bikehub not doing a review on the new store, Nils says you closer by to us now Opposite Pennypinchers in woodstock. Pickwick Road Edited January 11, 2017 by Myles Mayhew Link to comment Share on other sites More sharing options...
Meezo Posted January 11, 2017 Share Opposite Pennypinchers in woodstock. Prestwich street. wow CSixx Stoke Suspension Woodstock CycleWorks and Pennypinchers less than a km radium from me work! WIN! still think Nick and the team must do a store review thingy Chavo and Captain Fastbastard Mayhem 2 Link to comment Share on other sites More sharing options...
Capricorn Posted January 11, 2017 Share hmm, swelling plastic pistons: this old crap again. What does SRAM say about all this?That thread on MTBR is enough to put even me off SRAM brakes... Link to comment Share on other sites More sharing options...
cpelser Posted January 11, 2017 Share Ag nooit. Paid R5k for Guide brakes about 14 months ago and I've noticed my rear brake also getting sticky. What is the warranty period? My wife's front Guide RSC was also rebuilt just two weeks ago. Link to comment Share on other sites More sharing options...
droo Posted January 11, 2017 Share wow CSixx Stoke Suspension Woodstock CycleWorks and Pennypinchers less than a km radium from me work! WIN! still think Nick and the team must do a store review thingy Pickwick Rd. Coffee on your way to buy building supplies. And new and interesting ways to spend your leftover cash. We're still getting a few things tidied up, but we'll be getting onto here with some promo stuff in the next month or so, don't worry... Meezo, Wannabe and Chavo 3 Link to comment Share on other sites More sharing options...
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