trialsiain Posted October 11, 2013 Report Share Posted October 11, 2013 (edited) This is really starting to annoy me now, i grind my rim and pretty much 90% of the time in less than 2 weeks the brake is shit and it slips when i gap or anything and i nearly end up on back... ive tried ADMs LGMs Cousts Rockpads. Im using a Rockman singlewall rim and have tried using diamond cutting discs, stone and metal cutting discs (2.5mm). I notice when i take pads off their covered in this silvery stuff ? but even when i clean it off and put them back on the brake is pretty poor and needs a regrind even though grind feels adequate . Thanks Iain Edited October 11, 2013 by trialsiain Quote Link to comment Share on other sites More sharing options...
Kevinfor Posted October 11, 2013 Report Share Posted October 11, 2013 Try to brush the rim off after you grind it or get some compressed air and blow all the metal flakes off 1 Quote Link to comment Share on other sites More sharing options...
trialsiain Posted October 11, 2013 Author Report Share Posted October 11, 2013 Try to brush the rim off after you grind it or get some compressed air and blow all the metal flakes off hmm yea might work thanks. Maybe if i wash wheel straight after grinding ?? Quote Link to comment Share on other sites More sharing options...
Kevinfor Posted October 11, 2013 Report Share Posted October 11, 2013 Water should do the trick, dont add any fancy stuff though as it may form a surface on the rim Quote Link to comment Share on other sites More sharing options...
*gentlydoesit Posted October 11, 2013 Report Share Posted October 11, 2013 I sence a family biker moment coming 2 Quote Link to comment Share on other sites More sharing options...
Blake Posted October 11, 2013 Report Share Posted October 11, 2013 hose with your thumb over the end to get off the swarf Quote Link to comment Share on other sites More sharing options...
FamilyBiker Posted October 11, 2013 Report Share Posted October 11, 2013 I sence a family biker moment coming me not pretty much no idea whats wrong with my compound atm,so i couldnt be much help here... but my guess would be its the rim alloy vs. the wrong pads for it Quote Link to comment Share on other sites More sharing options...
dave33 Posted October 12, 2013 Report Share Posted October 12, 2013 26" rim ? Quote Link to comment Share on other sites More sharing options...
trialsiain Posted October 12, 2013 Author Report Share Posted October 12, 2013 Ayee Quote Link to comment Share on other sites More sharing options...
BradJohnson Posted October 12, 2013 Report Share Posted October 12, 2013 Tried water? 9 times out of 10 when your brakes isn't performing well is because of dirt on the rim. Spray it with some water and ride around dragging your brake for a few seconds and then leave to dry, should do the trick. Quote Link to comment Share on other sites More sharing options...
dave33 Posted October 13, 2013 Report Share Posted October 13, 2013 (edited) What did you clean the rim with ? Maybe it was oil based ? Clean both with hot water and fairy. Other than that have you bleed your magura right ? Clean the rim after you put your tyre on if you remove it to grind Edited October 13, 2013 by dave33 Quote Link to comment Share on other sites More sharing options...
FamilyBiker Posted October 13, 2013 Report Share Posted October 13, 2013 (edited) i use brake cleaner,its even getting off all the old tar when the grind is dead and you use tar Edited October 13, 2013 by FamilyBiker Quote Link to comment Share on other sites More sharing options...
dave33 Posted October 13, 2013 Report Share Posted October 13, 2013 i use brake cleaner,its even getting off all the old tar when the grind is dead and you use tar Doh that leaves a resadue behind Quote Link to comment Share on other sites More sharing options...
FamilyBiker Posted October 13, 2013 Report Share Posted October 13, 2013 Doh that leaves a resadue behind the stuff i have at work is absolutely free of anything that could remain on the rim. mostly isopropylic alcohol Quote Link to comment Share on other sites More sharing options...
trialsiain Posted October 13, 2013 Author Report Share Posted October 13, 2013 I've been doing that Dave and that's what ive been washing pads with too, and I always leave tyre on when I grind the wheel (: Quote Link to comment Share on other sites More sharing options...
bing Posted October 13, 2013 Report Share Posted October 13, 2013 Sand your pads, put a fresh grind on. If it still doesn't work, try different pads 1 Quote Link to comment Share on other sites More sharing options...
bike_dummie Posted October 13, 2013 Report Share Posted October 13, 2013 May be your actual rim that just doesn't like rim brakes kinda like the issues with trialtech rims? Probably cheaper to replace the rim as it's not cheap to keep on buying new pads just to try and get a brake that works? I got a rim you can have for postage if you want it? Presuming you need 26" Quote Link to comment Share on other sites More sharing options...
dave33 Posted October 13, 2013 Report Share Posted October 13, 2013 I've been doing that Dave and that's what ive been washing pads with too, and I always leave tyre on when I grind the wheel (: You washed the rim with hot water and fairy ? It's either rim or pads then, hard to tell without seeing it Quote Link to comment Share on other sites More sharing options...
*gentlydoesit Posted October 13, 2013 Report Share Posted October 13, 2013 Being a noob my thoughts might not be relavent due to lack of experience but ill offer them anyway have you tried a less course grind? I think that the peaks of the course grind are wearing off quickly or being rolled over. Try following the grain of the grind with a rotary wire brush on the next grind, that should remove the loosest material. As an abrasive spins it will take material off but on ally it deposits some of what's on the disc in a friction way, which will come off under load but won't wash off. 1 Quote Link to comment Share on other sites More sharing options...
trialsiain Posted October 13, 2013 Author Report Share Posted October 13, 2013 You washed the rim with hot water and fairy ? It's either rim or pads then, hard to tell without seeing it well cold water and fairy.. Being a noob my thoughts might not be relavent due to lack of experience but ill offer them anyway have you tried a less course grind? I think that the peaks of the course grind are wearing off quickly or being rolled over. Try following the grain of the grind with a rotary wire brush on the next grind, that should remove the loosest material. As an abrasive spins it will take material off but on ally it deposits some of what's on the disc in a friction way, which will come off under load but won't wash off. you may be right ill give it a try next grind Quote Link to comment Share on other sites More sharing options...
dave33 Posted October 13, 2013 Report Share Posted October 13, 2013 all of those pads should work well with that rim, maybe the rim material is the problem but its impossible to say with out seeing it Quote Link to comment Share on other sites More sharing options...
trialsiain Posted October 13, 2013 Author Report Share Posted October 13, 2013 all of those pads should work well with that rim, maybe the rim material is the problem but its impossible to say with out seeing it I should of asked you at shipley Quote Link to comment Share on other sites More sharing options...
US_BenR Posted October 14, 2013 Report Share Posted October 14, 2013 Here's what I do: I attached a spray nozzle to a bottle of 90% alcohol (rubbing), and I simply spray the rim down and wipe off the dirt. Sometime I'll spray the pads too, modulate them whilst the wheel is spinning and wipe off the excess again. It's easy...if I'm riding natural, I'll just throw the bottle in my dufflebag. It also looks like the pads may not be hitting the rim square--facing the mounts may help this. There's a TNN video somewhere on youtube that demonstrates this pretty well, if I am remembering correctly. Lastly, perhaps try altering the angle you are grinding the rim at. I find a near 90 degree angle gives the best results. Lastly (again), are the brakes properly bled? Quote Link to comment Share on other sites More sharing options...
trialsiain Posted October 14, 2013 Author Report Share Posted October 14, 2013 Ive found this on another forum http://www.observedtrials.net/vb/f21/does-happen-your-pads-46566/ Quote Link to comment Share on other sites More sharing options...
*gentlydoesit Posted October 14, 2013 Report Share Posted October 14, 2013 Ive found this on another forum http://www.observedtrials.net/vb/f21/does-happen-your-pads-46566/I just read that but didn't see an answer to the problem? Quote Link to comment Share on other sites More sharing options...
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