Dman Posted March 23, 2016 Report Share Posted March 23, 2016 Brake issues again. I'm currently in France on a riding trip, my brakes went to shit, really noisy, not working, I've had to buy new discs and pads, just set it all back up, cleaned everything, no signs of any leaks, got calipers and rotors aligned perfectly. Now I need to bed them in, is there a video or anything showing the best bedding in procedure? Thanks Quote Link to comment Share on other sites More sharing options...
Mark W Posted March 23, 2016 Report Share Posted March 23, 2016 Bit of water on the pads/rotor, then pedal around on flat pulsing the brake on and off. You don't need to get them hot (as that just increases the chances of them glazing which slows the whole process down), you're effectively just scrubbing the surface of the pads and rotors. Repeat that a few times and you should be set. You'll feel and hear them starting to work better. You can clean them off with some clean kitchen towel or a clean rag if you want to, but I generally just do the water thing a couple of times and they're good to go. 2 Quote Link to comment Share on other sites More sharing options...
Dman Posted March 23, 2016 Author Report Share Posted March 23, 2016 I don't get what the water does? Quote Link to comment Share on other sites More sharing options...
bing Posted March 23, 2016 Report Share Posted March 23, 2016 It acts like a cutting agent, helps to get the pads flat/keyed to the rotor surface 3 Quote Link to comment Share on other sites More sharing options...
Dman Posted March 23, 2016 Author Report Share Posted March 23, 2016 Cool, what is the main cause of squeal? There was a lot of black stuff on rotor and pads. Quote Link to comment Share on other sites More sharing options...
Mark W Posted March 23, 2016 Report Share Posted March 23, 2016 On the old or new? If it's the new, it's generally just the kind of cutting paste that the water and the pads/rotor form. If it's the old one it could be a similar-ish substance, but if you've contaminated the brake with anything it might be that getting in the mix as well. Equally, if that was with the old one it could be that the pads might be a bit glazed, but if you've got the TT/Jitsie style pads they usually come good again really quickly without needing to do much extra to them. Quote Link to comment Share on other sites More sharing options...
Dman Posted March 23, 2016 Author Report Share Posted March 23, 2016 The old ones Quote Link to comment Share on other sites More sharing options...
ben_travis Posted March 24, 2016 Report Share Posted March 24, 2016 (edited) 13 hours ago, Mark W said: Bit of water on the pads/rotor, then pedal around on flat pulsing the brake on and off. You don't need to get them hot (as that just increases the chances of them glazing which slows the whole process down), you're effectively just scrubbing the surface of the pads and rotors. Polar opposite to what i've always done (pedal around like f*ck dragging the brake and then pour water on it)...and I think i'll be doing it your way in future. #brakenoob Edited March 24, 2016 by ben_travis Quote Link to comment Share on other sites More sharing options...
Dman Posted March 24, 2016 Author Report Share Posted March 24, 2016 I always ruin brakes Ben, most stuff online says roll down a hill pulling brake in gradually until you stop, then repeat. Quote Link to comment Share on other sites More sharing options...
AdamR28 Posted March 24, 2016 Report Share Posted March 24, 2016 That's why you aren't having much luck with them... As Mark said, keep things cool - this is a trials bike, not a DH bike If the old pads / rotor were covered in black shit that's contamination. Even touching the rotor will your fingers will contaminate the brake and reduce performance... Quote Link to comment Share on other sites More sharing options...
Dman Posted March 24, 2016 Author Report Share Posted March 24, 2016 It's like an operating theatre when I install brakes never touch anything. Not sure what goes wrong. I'm off to bed then in now see what happens. Quote Link to comment Share on other sites More sharing options...
AdamR28 Posted March 24, 2016 Report Share Posted March 24, 2016 Haha. Probably other people - I used to get that all the time, didn't have the balls to tell them to do one though 1 Quote Link to comment Share on other sites More sharing options...
Dman Posted March 24, 2016 Author Report Share Posted March 24, 2016 Do you also recommend water @Adam@TartyBikes Quote Link to comment Share on other sites More sharing options...
AdamR28 Posted March 24, 2016 Report Share Posted March 24, 2016 Yep, exactly as Mark said - I taught him after he spent ages fecking about doing it a different way 2 Quote Link to comment Share on other sites More sharing options...
bing Posted March 24, 2016 Report Share Posted March 24, 2016 I've always done it cold, pour water on, ride round with brake on, water on again, ride with brake on, water on again, ride with brake on, let it cool down and clean with solvent brake cleaner. Works everytime for me Quote Link to comment Share on other sites More sharing options...
Dman Posted March 24, 2016 Author Report Share Posted March 24, 2016 Just after the water they are really good but it seems to fade to just OK after a while? @Adam@TartyBikes @Mark W Quote Link to comment Share on other sites More sharing options...
JJ Leigh Posted March 24, 2016 Report Share Posted March 24, 2016 1 hour ago, Dman said: Just after the water they are really good but it seems to fade to just OK after a while? @Adam@TartyBikes @Mark W keep going a couple more times, just ride and pulse the brakes. It SHOULD just eventually go away out of nowhere. Any shit in your pistons? brakes topped up properly/bled properly? bpc adjusted etc? Shouldn't really have to adjust anything if bled correctly. If your using sram guides I reckon it COULD be the problem... Only because everybody I know who uses them/has used them has had problems with them, apparently the fluid is bizarre too and literally gets hot or something I've not used them myself but could be something along those lines. who knows. Quote Link to comment Share on other sites More sharing options...
AdamR28 Posted March 25, 2016 Report Share Posted March 25, 2016 18 hours ago, Dman said: Just after the water they are really good but it seems to fade to just OK after a while? @Adam@TartyBikes @Mark W What brakes and pads? Quote Link to comment Share on other sites More sharing options...
Dman Posted March 25, 2016 Author Report Share Posted March 25, 2016 (edited) Sram guide ultimate, sintered pads, shimano rt66 rotors, fronts fine, rear is good just after water then seems to lose a bit of power? @Adam@TartyBikes Edited March 25, 2016 by Dman Quote Link to comment Share on other sites More sharing options...
bing Posted March 25, 2016 Report Share Posted March 25, 2016 If they are owt like avids, you need avid pads and rotors to get maximum effectiveness. Prob best to get standard SRAM pads and those fancy disks with the slots in Quote Link to comment Share on other sites More sharing options...
Dman Posted March 25, 2016 Author Report Share Posted March 25, 2016 Already done that, it happens to all my brakes, guides, saints, zees only brakes I had no trouble with was hope trial zones. Quote Link to comment Share on other sites More sharing options...
Paperclip Posted March 25, 2016 Report Share Posted March 25, 2016 The mind boggles, he's new pads and rotors both pretty decent. Bedded them in fine nothing I wouldn't do but they just don't seem right. At first I thought it was just Karl being a tard and not pulling them right but after going on then they're slightly off. I think the rear personally is just way underpowered so it's just about good enough but when you really need it it's not there 100% to me fronts bang on. I'd go as far as finding a better caliper that uses the same fluid as the levers are really nice. Quote Link to comment Share on other sites More sharing options...
Dman Posted March 25, 2016 Author Report Share Posted March 25, 2016 These new ones are different calipers than the old guide rsc. Quote Link to comment Share on other sites More sharing options...
Ali C Posted March 29, 2016 Report Share Posted March 29, 2016 from my use on the Sram brakes they do seem generally under powered compared with others. Quote Link to comment Share on other sites More sharing options...
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