Trialsben Posted August 27, 2009 Report Share Posted August 27, 2009 Got some KOT forks about 2 years ago with my KOT frame and been happily using them with Magura's since. Changed to the old shim set-up Hope Mono Trial discs a couple of months ago and it seems impossible to stop them squealing! Had the disc mounts faced but they seem to need a huge amount of material taking off of them to get them straight, it seems as if the disc mount has been welded on at the wrong angle.Just wondering if anyone has had this problem and found a fix or if there's anything else I can do to stop the squealing and rubbing as it's doing my nut!I always pump the brakes up held on the disc then align them so i can see a gap either side of the pads. they ride fine for about 10mins then just start rubbing again. Bleeding the brakes seems to make no difference either.Any help would be much appreciated.Thanks. Quote Link to comment Share on other sites More sharing options...
Alex Dark Posted August 27, 2009 Report Share Posted August 27, 2009 sounds like sticky pistons? polish them with autosol and lube them with dot fluid....or for bets results ask muel, as he's a bit of a hope wizard as far as i can make out Quote Link to comment Share on other sites More sharing options...
Trialsben Posted August 27, 2009 Author Report Share Posted August 27, 2009 Thanks, will give that a try. Given them a quick wipe and clean but not gone as far as as polishing them as they've had very little use to be honest.Still got a sneaking suspicion my disc mount is out of alignment as they seem almost impossible to face, the facing tool says I should be almost taking half the lower tab away to get it straight Quote Link to comment Share on other sites More sharing options...
Muel Posted August 27, 2009 Report Share Posted August 27, 2009 or for bets results ask muel, as he's a bit of a hope wizard as far as i can make out I try. If the alignment is constantly changing so the pads start rubbing, I'd say you're getting dry/sticky seals.How old's the brake? Has it been ridden much in the rain? If it gets very wet, then the pistons corrode where the seals sit, and this may be the cause of this problem.I was going to do a video guide, but my Dad was away with the camera when I last rebuilt my brake, but I'll right up a wiki thing tommorrow and post a link in here, might help. Quote Link to comment Share on other sites More sharing options...
Trialsben Posted August 27, 2009 Author Report Share Posted August 27, 2009 If the alignment is constantly changing so the pads start rubbing, I'd say you're getting dry/sticky seals.How old's the brake? Has it been ridden much in the rain? If it gets very wet, then the pistons corrode where the seals sit, and this may be the cause of this problem.I was going to do a video guide, but my Dad was away with the camera when I last rebuilt my brake, but I'll right up a wiki thing tommorrow and post a link in here, might helpThe brake is pretty old, it's one of the first ones they made I think. It's probably been used about 20 times max though and been bled twice.A video guide or "How to" would be really cool though if you have time. Thanks! Quote Link to comment Share on other sites More sharing options...
Pashley26 Posted August 27, 2009 Report Share Posted August 27, 2009 The brake is pretty old, it's one of the first ones they made I think. It's probably been used about 20 times max though and been bled twice.Thats your problem...Pop the pistons out and polish them up, then lubricate them ever so slightly with some brake fluid as suggested. http://www.hopetech.com/database/Mono_Trial_Caliper.pdf Quote Link to comment Share on other sites More sharing options...
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