modifiedridah2k9 Posted September 11, 2010 Report Share Posted September 11, 2010 (edited) Ahh ... Sorry I'm really angry at my brakes just now. So heres whats happening...: I keep getting lazy pistons and somehow oil keeps getting onto my rim even after sanding my pads and a new grind, the oil isnt the problem though. The lasy pistons... When you have a lasy piston does it make your brake worse? Also my brake with heatsink yellows and a water bleed and is perfectly square is CRAP. The hold is okay but the bite... Someone with no teeth could have a better bite than that. How do I make the bite better? I like to roll on the back wheel so bite is important. Its annoying when i see people with perfect brakes that stay that way, then im really happy cos mine work then the next day it is proper rubbish... One problem straight after the other. Please help as this is making me want to quit trials because my brake has always been like this, every brake i have ever had always failed in some way and i cant put up with it braking every 5 minutes. Cheers. Edited September 11, 2010 by modifiedridah2k9 Quote Link to comment Share on other sites More sharing options...
Luke Rainbird Posted September 11, 2010 Report Share Posted September 11, 2010 Your best bet if you're having lots of problems is to either replace the brake, or to completely take it to bits and service it. So long as it's not leaking you can strip things right back, removing the pistons and cleaning them, giving them a quick rub with some wet'n'dry and lube them up when you stick them back in. A fresh bleed, cleaned/flattened off pads, a fresh grind or clean rim and set it all up like new. Quote Link to comment Share on other sites More sharing options...
modifiedridah2k9 Posted September 11, 2010 Author Report Share Posted September 11, 2010 Your best bet if you're having lots of problems is to either replace the brake, or to completely take it to bits and service it. So long as it's not leaking you can strip things right back, removing the pistons and cleaning them, giving them a quick rub with some wet'n'dry and lube them up when you stick them back in. A fresh bleed, cleaned/flattened off pads, a fresh grind or clean rim and set it all up like new. I don't have a clue how to do any of that, except for clean the rim and flatten pads. But considering the last few days i have cleaned my rim about 4 times a day... I guess that wont work. Quote Link to comment Share on other sites More sharing options...
Luke Rainbird Posted September 11, 2010 Report Share Posted September 11, 2010 Pull things apart, take a look at how they work/go together. Best way to learn There are guides kicking about on here for sorting piston issues/how to bleed etc Check the general setup when you replace the brake too - get it perfect and it takes another source of problems out of the equation. Tarty has a video guide on this. Quote Link to comment Share on other sites More sharing options...
Mark W Posted September 11, 2010 Report Share Posted September 11, 2010 Somehow oil keeps getting onto my rim even after sanding my pads and a new grind... Where's the oil coming from? Quote Link to comment Share on other sites More sharing options...
modifiedridah2k9 Posted September 11, 2010 Author Report Share Posted September 11, 2010 Where's the oil coming from? I dont know. Right i cleaned my rims and pads because they had oil on them from when i sorted a lasy piston. Then I got another lasy piston, so i fixed that before putting the pads and wheel back on. I think the oil has dripped on the piston/ bit that hold the pad in place, onto my rim/pad. So i cleaned it again, sanded my pads and got a fresh grind. It looks like some black stuff is on my pads just now, yet when i got the grind and sanded the pads, i never touched the thing with oil and i wiped the piston oil-clean. So yeah there is black stuff on the pads and i dont know what it is, im not cleaning them because it will probably be a waste of time considering they had this stuff on them a few days ago and the brake was really good a few days ago. Now I wish i got a double disc echo for my birthday But the thing is... Its only the bite that is bad. The hold is good, is this caused by the lasy piston? Im not quitting as i thought about it and said to myself 'i can still ride it, just with not very good bite.' Oh and I moved my pads out because they worked better that way, and whilst tightening the bolts up i rounded them both. Now i have to pay £5 each for titanium booster bolts Im gonna try ride it, also there is a chance that it was rubbish because of the rain but it wasnt raining at this point, just the grass was wet. Thanks everyone for your help. Quote Link to comment Share on other sites More sharing options...
Mark W Posted September 11, 2010 Report Share Posted September 11, 2010 If you ride in the wet you'll also get 'black crap' all over your pads/rim too, so it might not be oil. Sticky pistons (or the symptoms of them) can also be caused if you're using a load of TPA as well. Regarding the booster bolts, why not get steel ones and save a load of money? Quote Link to comment Share on other sites More sharing options...
modifiedridah2k9 Posted September 11, 2010 Author Report Share Posted September 11, 2010 If you ride in the wet you'll also get 'black crap' all over your pads/rim too, so it might not be oil. Sticky pistons (or the symptoms of them) can also be caused if you're using a load of TPA as well. Regarding the booster bolts, why not get steel ones and save a load of money? I never knew you could get steel ones... thanks alot everyone. Quote Link to comment Share on other sites More sharing options...
trials owns Posted September 11, 2010 Report Share Posted September 11, 2010 (edited) put some silicone lube on the pistons to make it really lubey, spray isnt as good, what was you using to lube them up? have you been riding in the rain or straight after its been cleaned, if so that could be the reason for the black crap on the pads/rim. if not i think that you need a new set of cylinders if your sure its a oil leak coming from them. EDIT beaten to it on the wet surface. Edited September 11, 2010 by trials owns Quote Link to comment Share on other sites More sharing options...
modifiedridah2k9 Posted September 11, 2010 Author Report Share Posted September 11, 2010 Your best bet if you're having lots of problems is to either replace the brake, or to completely take it to bits and service it. So long as it's not leaking you can strip things right back, removing the pistons and cleaning them, giving them a quick rub with some wet'n'dry and lube them up when you stick them back in. A fresh bleed, cleaned/flattened off pads, a fresh grind or clean rim and set it all up like new. So if i take the pistons out, will i need to bleed it? Also how do i bleed, and do i need 1 or 2 bleed hoses? Also how do i get the piston out? Just took the rear end of the bike to pieces so tell me what to do please Quote Link to comment Share on other sites More sharing options...
Mark W Posted September 11, 2010 Report Share Posted September 11, 2010 http://www.magura.com/uploads/media/downloads/FELGEN_06_E.pdf Quote Link to comment Share on other sites More sharing options...
dirt jumper jake Posted September 11, 2010 Report Share Posted September 11, 2010 if you keep getting a lazy piston, why not change the slaves? and i used to get black shit on my koxx pads all the time. dont worry about it, i gave up cleaning them and just rid. what are you spraying to get rid of the lazy piston? i dont use GT85, get some rubber grease (red in colour) works a treat. works well on putting pistons back in on hs33's/mono trials. Quote Link to comment Share on other sites More sharing options...
modifiedridah2k9 Posted September 12, 2010 Author Report Share Posted September 12, 2010 if you keep getting a lazy piston, why not change the slaves? and i used to get black shit on my koxx pads all the time. dont worry about it, i gave up cleaning them and just rid. what are you spraying to get rid of the lazy piston? i dont use GT85, get some rubber grease (red in colour) works a treat. works well on putting pistons back in on hs33's/mono trials. Dont know how to change the slaves. Turns out the black crap was just the shadow going onto little rubber shavings from my pads because i drag my brake alot and i just had a new grind so they wore down a bit, I use WD40 to get rid of lasy pistons. Its fine now my brake is working very well. Cheers. Quote Link to comment Share on other sites More sharing options...
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