bjap2022 Posted December 13, 2022 Report Share Posted December 13, 2022 Hi All, Has anyone experienced issues with Hope Trial Zone disc setups? Specifically with the rear calliper making a "clunking" noise when on the rear wheel? I love a quiet riding bike, so find this super annoying! For context, below is my setup: - Frame = 24" Inspired FourPlay, Brake = Hope Trial Zone, Hub = Hope Pro 2, Rotor = Hope Trial Zone (200 mm). In detail, I tend to find that when on the rear wheel, a clunking noise emanates when completing forward/rearward/upward moves. Below follows the steps I've taken to resolve: 1) Early on, I found that the upper most frame/adapter bolt would routinely work loose. I put this down to torque reversals, which eventually would ruin the threads inside the adapter. 2) I then replaced the adapters, used longer bolts so the threads of the adapter are fully utilised, applied a small amount of thread lock and applied a decent torque (11 nM). This appears to have resolved that particular issue. 3) I still was getting clunking noises from the rear, so threw away the Tarty bikes chain stay protector and adapted a tube to dampen chain noise. OK the bike now runs quieter, but still the clunking noise is present... 4) I then wondered if the rotor itself was working loose, so replaced the hub bolts and torqued them upto 6 nM. They appear to be holding fine now, and still the clunking noise continues. 5) With the bike on the flat, I clamped the rear brake and rapidly rocked the rear wheel back and forth to re-create the forces. Definitely the noise is coming from the calliper. In conclusion, I believe that the pads probably "rock" to some degree within the calliper, despite them bolt holding the pads in place being tightened to 5 nM. Has anyone else experienced similar issues? Super annoying if you like a quiet running bike! Cheers Ben Quote Link to comment Share on other sites More sharing options...
AdamR28 Posted December 13, 2022 Report Share Posted December 13, 2022 Pads moving in caliper, nothing to do with pad pin (clearance is necessary for brake function, the pin only stops them dropping out). Its normal, and will bed in / go away with use. Quote Link to comment Share on other sites More sharing options...
Daan Posted December 13, 2022 Report Share Posted December 13, 2022 What Adam says. I find sanding away the paint on the back of the pads helps (it's what the pistons do after a while anyway). Quote Link to comment Share on other sites More sharing options...
bjap2022 Posted December 13, 2022 Author Report Share Posted December 13, 2022 @AdamR28 and @Daan - That's truly really kind of you to come back to me so quickly. I'll have a go at sanding the rear of the pads! Nice one guys. Quote Link to comment Share on other sites More sharing options...
bjap2022 Posted December 14, 2022 Author Report Share Posted December 14, 2022 I checked out the pads (Trialtech Sport) and its clear the piston has bedded into the rear of the pad.... + No paint to sand! Doesn't appear as though the wear mark is in anyway highlighting that the pad is moving over the piston. Squinting with a fine eye, it may appear the wear "circle" of the piston is ever so slightly asymmetrical perhaps. In that respect, the top loop definitely appears asymmetrical though suggesting movement in some way within the calliper. Quote Link to comment Share on other sites More sharing options...
AdamR28 Posted December 15, 2022 Report Share Posted December 15, 2022 Hmm. Looks a bit grubby. The circle should be bright and shiny. I'd give the back of the pad a clean and a sand, and degrease inside the caliper carefully. Quote Link to comment Share on other sites More sharing options...
bjap2022 Posted December 18, 2022 Author Report Share Posted December 18, 2022 Just came across this Ali C video - Suggests using tape to stop the pads moving around. I wonder if sanding the pads down would affect the pistons. I know some manufacturers make brake pistons from magnesium which is a soft metal, so assume a sanded brake pad may have the potential to erode a piston? No idea what material Hope are using for their pistons in the trial zone calipers. Quote Link to comment Share on other sites More sharing options...
AdamR28 Posted December 18, 2022 Report Share Posted December 18, 2022 Aluminium piston on the Trial Zone. Who allegedy makes pistons from magnesium? That would be a very strange choice. Have you followed the steps I described yet? Quote Link to comment Share on other sites More sharing options...
bjap2022 Posted December 18, 2022 Author Report Share Posted December 18, 2022 Ah nice, good to know. Going to look at it tomorrow I think. Quote Link to comment Share on other sites More sharing options...
Target Posted December 18, 2022 Report Share Posted December 18, 2022 (edited) I had similar clunking noise when I first installed a rear Hope TZ with new Jitsie pads. I red on the forum that this sound will go away eventually. I kept riding and waiting, but the sound didn't go away, and it was really annoying! At some point, I kind of got used to the sound and stopped noticing it. Also the pad backings finally bed in, and the clunking stopped. I think it took about 2-3 months until the sound completely disappeared. So my point is, the easiest way to fix the issue could be just to ride more and wait for backings to bed in. It may take longer than you expect though. Edited December 18, 2022 by Target Quote Link to comment Share on other sites More sharing options...
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