hdmackay Posted January 31, 2010 Report Share Posted January 31, 2010 Hey, My Magura is really wierd and i'm not sure what's wrong with it. When you pull in the lever the pads push in but one side doesn't return and stays in, therefore rubbing off the rim. So then if you pull it back with your fingers and pull the lever again, it might be the other side that won't return. So because both sides do it, it's not a lazy piston. Does anyone know what I can do? It's really pissing me off. I tried re-bleeding. Didn't work. Cheers. Quote Link to comment Share on other sites More sharing options...
josh barker Posted January 31, 2010 Report Share Posted January 31, 2010 if you are running cnc'd backings the o-ring may be a bit stiff so take it off and put a bit of water on the o-ring and push it bach on gently. Quote Link to comment Share on other sites More sharing options...
hdmackay Posted January 31, 2010 Author Report Share Posted January 31, 2010 if you are running cnc'd backings the o-ring may be a bit stiff so take it off and put a bit of water on the o-ring and push it bach on gently. It's the actual slave that's not returning so how will that make a difference? And just checked, now when I pull the lever in BOTH pistons stay in. :'( Quote Link to comment Share on other sites More sharing options...
josh barker Posted January 31, 2010 Report Share Posted January 31, 2010 (edited) It's the actual slave that's not returning so how will that make a difference? And just checked, now when I pull the lever in BOTH pistons stay in. :'( maybe there might be bits of frozen water in your brake??? therefor siezing the brake a bit maybe if not theres got to be air in the brake Edited January 31, 2010 by josh barker Quote Link to comment Share on other sites More sharing options...
hdmackay Posted January 31, 2010 Author Report Share Posted January 31, 2010 maybe there might be bits of frozen water in your brake??? therefor siezing the brake a bit maybe if not theres got to be air in the brake Don't think so because I can retract it with my hands. If it was frozen it would be stuck. And i've got a water/ antifreeze bleed. Cheers for the help though. Quote Link to comment Share on other sites More sharing options...
josh barker Posted January 31, 2010 Report Share Posted January 31, 2010 if not that then it must be a leak Quote Link to comment Share on other sites More sharing options...
smithy83 Posted January 31, 2010 Report Share Posted January 31, 2010 the pads will still retract even if there is a leak,have you tried spraying a bit of lube on them as they do get dry sometimes or if they get dusty or some crap in them?And have you got your tpa adjuster wound all the way in as the pad wont retract all the way if you have. Quote Link to comment Share on other sites More sharing options...
Borat Posted January 31, 2010 Report Share Posted January 31, 2010 Take the slaves off the bike, take the pads out, then pull the lever all the way in, and spray both pistons (on the slaves) with wd40 or whatever. Try it and report back. Quote Link to comment Share on other sites More sharing options...
Skilled trials Posted January 31, 2010 Report Share Posted January 31, 2010 take the brake off and put an elastic band round each cylinder{behind the pads] casuing it to pull each one back. this will work Quote Link to comment Share on other sites More sharing options...
hdmackay Posted January 31, 2010 Author Report Share Posted January 31, 2010 the pads will still retract even if there is a leak,have you tried spraying a bit of lube on them as they do get dry sometimes or if they get dusty or some crap in them?And have you got your tpa adjuster wound all the way in as the pad wont retract all the way if you have. TPA is all the way out. And I know what you mean Take the slaves off the bike, take the pads out, then pull the lever all the way in, and spray both pistons (on the slaves) with wd40 or whatever. Try it and report back. Aye, might try that. Need to stock up on WD40 though. Quote Link to comment Share on other sites More sharing options...
davey1991 Posted February 1, 2010 Report Share Posted February 1, 2010 Take the slaves off the bike, take the pads out, then pull the lever all the way in, and spray both pistons (on the slaves) with wd40 or whatever. Try it and report back. Never use WD40 it isn't a lubricant its a penetrating oil. This seems to be a far to common misconception. Use some sort of 3 in 1 oil and they should be as smooth as new. Quote Link to comment Share on other sites More sharing options...
Ben John-Hynes Posted February 1, 2010 Report Share Posted February 1, 2010 Is it your lever, possibly? It may be the master that's not playing along properly. Whatever the problem is, take all the hose off(main and crossover) the brake and blow loads of water through it with a syringe, as there may be a load of gunk in there somewhere. That should clear any blockages, if there are any, and will sort your problem. Quote Link to comment Share on other sites More sharing options...
Phatmike Posted February 1, 2010 Report Share Posted February 1, 2010 Do as mentioned - with the WD40/GT85, on both slave cylinders and the inside of the lever body, to clean them off - use a rag/toothbrush too. Then lube up all the pistons with grease. People seem to forget that Maguras aren't fit and forget items, and need maintenance to perform at their best consistently. Quote Link to comment Share on other sites More sharing options...
CurtisRider Posted February 1, 2010 Report Share Posted February 1, 2010 I found silicone spray to achieve better results than wd40/generic brand with the same stuff inside. Quote Link to comment Share on other sites More sharing options...
Mtchell Posted February 1, 2010 Report Share Posted February 1, 2010 I had this problem always seems to be in winter too, I did what phat mike said couple weeks agos and it worked a treat but they are started to play up again. I believe the gritting of roads and paths play a big part in seizing the pistons, The rear tyre does pick some shit up and slings it every where so no surprise the pistons play up in these conditions. Quote Link to comment Share on other sites More sharing options...
hdmackay Posted February 1, 2010 Author Report Share Posted February 1, 2010 Cheers for all the help guys. I'll give it a shot when I get the time and will say if it works or not. Just one thing I need cleared up... Never use WD40 it isn't a lubricant its a penetrating oil. Do as mentioned - with the WD40/GT85, Should I or shouldn't I use WD40? Please tell me whats best to use. Thanks very much. Quote Link to comment Share on other sites More sharing options...
Phatmike Posted February 1, 2010 Report Share Posted February 1, 2010 Use it to clean off all the black crap, then use grease. Both steps are equally important. Quote Link to comment Share on other sites More sharing options...
hdmackay Posted February 1, 2010 Author Report Share Posted February 1, 2010 Use it to clean off all the black crap, then use grease. Both steps are equally important. Alright cheers Mike. And since your here, when will your emulsion be ready? I'm definately interested. Quote Link to comment Share on other sites More sharing options...
Phatmike Posted February 1, 2010 Report Share Posted February 1, 2010 Good point, I've taken my mind off that working on other products. I'll try and get it out (hopefully with everything else) in the next month or two. Quote Link to comment Share on other sites More sharing options...
hdmackay Posted February 1, 2010 Author Report Share Posted February 1, 2010 Good point, I've taken my mind off that working on other products. I'll try and get it out (hopefully with everything else) in the next month or two. Ok. Sounds good. :wink2: Quote Link to comment Share on other sites More sharing options...
Ross McArthur Posted February 1, 2010 Report Share Posted February 1, 2010 Mcfly! Mcfly! Read whats being said lad! Use GT85/WD40 to clean the pistons!!!! CLEAN AND CLEAN ONLY! Then put 3 in 1 oil or grease on the slaves to lube them and protect them from gunk and help them run smooth. Quote Link to comment Share on other sites More sharing options...
CC12345678910 Posted February 1, 2010 Report Share Posted February 1, 2010 I used WD40 when I did mine but I then re-bled mine with OIL(you know, that stuff ur maggie been missing out on) and did it twice so I guess it didn't matter ifthe WD penetrated the system. Quote Link to comment Share on other sites More sharing options...
Mark W Posted February 1, 2010 Report Share Posted February 1, 2010 Just to make sure, maybe loosen your lever bolt to make sure it's not just that that's tightened itself up a bit? Mine did that a while back and did exactly what you said. Might be worth loosening it off a touch and see if that sorts you. If you've got a load of TPA wanged on it can make that happen. Quote Link to comment Share on other sites More sharing options...
hdmackay Posted February 1, 2010 Author Report Share Posted February 1, 2010 Just to make sure, maybe loosen your lever bolt to make sure it's not just that that's tightened itself up a bit? Mine did that a while back and did exactly what you said. Might be worth loosening it off a touch and see if that sorts you. If you've got a load of TPA wanged on it can make that happen. Nah, my brakes the opposite. The bolt comes out every 5 minutes! Haha. Anyway, thanks soo much guys! It's fixed noww. and feels quicker than ever! Quote Link to comment Share on other sites More sharing options...
Matt Vandart Posted February 1, 2010 Report Share Posted February 1, 2010 So what did you do? Mine was doing this so I bled it with pure virgin pussy juice and then rebled with water then it worked just fine. Quote Link to comment Share on other sites More sharing options...
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