SamKidney Posted February 3, 2011 Report Share Posted February 3, 2011 (edited) Right guys. I had a fresh grind applied to my rear rim on saturday and was very pleased with how the brake was performing. However, I rode some natural last night and mud, water ect got into the grind. Went in, cleaned the grind and the pads. Set it up again. 3 hours riding today and the brake is nothing short of rubbish. No real bite, hold or noise, which is very off putting. Grind is still sharp and deep. Setup is TrialTech sport 19" TNN LGMs V!Z clamps. Medium, Deep grind. Any ideas why the brake my be lacking in performance? Edit; Pics now added. Clean pads. Still need to be sanded flat Rim as is. Still sharp and deep Edited February 3, 2011 by Echo Lite 09 Quote Link to comment Share on other sites More sharing options...
Mark W Posted February 3, 2011 Report Share Posted February 3, 2011 Did you move the cylinders when you were cleaning everything? Quote Link to comment Share on other sites More sharing options...
monkeyseemonkeydo Posted February 3, 2011 Report Share Posted February 3, 2011 What did you use to clean the rim and pads? Quote Link to comment Share on other sites More sharing options...
SamKidney Posted February 3, 2011 Author Report Share Posted February 3, 2011 Brake cylinders didnt move. I took out the wheel, then the pads. Gave the pads a quick sand to remove any surface grime, and jet washed the grind to remove any dirt. Grind is very clean, deep and sharp, pads are clean too. When i put the wheel back in i made sure that the tyre didnt touch the pads (deflated obvs) and set up my snail cams as they were before. (Ive drawn a little mare with a sharpee to make sure my wheel is always in the same place. Inflated tyre. Went out this morning and its shocking. I checked my pads again and there just seems to be a silvery smudge on them all the time now, wheras before they were always green. Never had this problem with any other rim than trialtech. Quote Link to comment Share on other sites More sharing options...
Luke Dunstan Posted February 3, 2011 Report Share Posted February 3, 2011 If your pads aren't put back in the exact same way you took them out, they'll be contacting at a different angle. Which can make both bite and hold feel pretty sloppy. Inspect the ads and make sure they are where they should be. Quote Link to comment Share on other sites More sharing options...
SamKidney Posted February 3, 2011 Author Report Share Posted February 3, 2011 If your pads aren't put back in the exact same way you took them out, they'll be contacting at a different angle. Which can make both bite and hold feel pretty sloppy. Inspect the ads and make sure they are where they should be. Definatley in the same way, as I didnt remove the slaves when I cleaned everything. Pads came out, cleaned, and went back in. Slaves are in exactly the same postion Quote Link to comment Share on other sites More sharing options...
Theta2 Posted February 3, 2011 Report Share Posted February 3, 2011 Definatley in the same way, as I didnt remove the slaves when I cleaned everything. Pads came out, cleaned, and went back in. Slaves are in exactly the same postion You say you sanded the pads but adjusted nothing? Try the TPA? Quote Link to comment Share on other sites More sharing options...
SamKidney Posted February 3, 2011 Author Report Share Posted February 3, 2011 You say you sanded the pads but adjusted nothing? Try the TPA? Ive taken the full brake setup apart now. Rim is getting a good clean, Pads are getting sanded flat. Will all be set up nice and square later and bedded in again. Quote Link to comment Share on other sites More sharing options...
N.Wood Posted February 3, 2011 Report Share Posted February 3, 2011 To be honest I've found it doesn't matter what you clean your rim with, it'll always be shit. Could you just whack on a fresh grind? Quote Link to comment Share on other sites More sharing options...
Pepo09 Posted February 3, 2011 Report Share Posted February 3, 2011 (edited) Try cleaning the surface of the rim with thinner so that all the grease on the rim goes out then wait until it dries and sand the pads again just a little bit and check if it works I did this with mine and worked perfectly Edited February 3, 2011 by Pepo09 Quote Link to comment Share on other sites More sharing options...
Dave Anscombe Posted February 3, 2011 Report Share Posted February 3, 2011 ive had this with my lmg......i ride losts of natural /muddy stuff/and through streams.....i just wait till it comes back to normal..... ive found this problem has only ever happend with the lmg brake pads...everyother pad has been fine.....when it works it works well ... phat pads on the way Quote Link to comment Share on other sites More sharing options...
SamKidney Posted February 4, 2011 Author Report Share Posted February 4, 2011 right, Went out tonight and thing have begun to improve. Rode around draging the brake to get the pads worn in again, and the brake seems to be biting allot better Hold is getting there too. Im going to get a power sander on the pads tomorrow to ensure they are properly flat surfaced, as they look a little rounded. Will see how things go Quote Link to comment Share on other sites More sharing options...
Dan6061 Posted February 4, 2011 Report Share Posted February 4, 2011 Pour water on the rim/pads. Ride around dragging the brake. Repeat. Pads probably need to bed in again. Just give them time! I used to do this with mine, then leave pour water on one last time, leave it in the sun to dry (good luck with that...) and then it'd be amazing again! Quote Link to comment Share on other sites More sharing options...
SamKidney Posted February 4, 2011 Author Report Share Posted February 4, 2011 Im inpatient and riding tomorrow morning So want it working proper like Quote Link to comment Share on other sites More sharing options...
Dan6061 Posted February 4, 2011 Report Share Posted February 4, 2011 Do it oldskool and pour a fizzy drink on the rim then. Used to do that with my Magura when my rim's sidewalls were too thin to grind anymore... Quote Link to comment Share on other sites More sharing options...
Azarathal Posted February 4, 2011 Report Share Posted February 4, 2011 Do it oldskool and pour a fizzy drink on the rim then. Used to do that with my Magura when my rim's sidewalls were too thin to grind anymore... Up to rear. Tuck too far. Anally raped by a wasp. Quote Link to comment Share on other sites More sharing options...
SamKidney Posted February 5, 2011 Author Report Share Posted February 5, 2011 Very pleased to say my brake is now working again Maybe not quite the same but holds well enough and the bites good too. Thanks for the tips! Quote Link to comment Share on other sites More sharing options...
Greetings Posted February 6, 2011 Report Share Posted February 6, 2011 Pour water on the rim/pads. Ride around dragging the brake. Repeat. People often forget how good this method is for improving braking performance. Definitely worth a go - no matter how good your brake is, it will improve it further (not aimed at the topic poster). Works with disc brakes too. Quote Link to comment Share on other sites More sharing options...
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