STEVE-0 Posted April 28, 2010 Report Share Posted April 28, 2010 Hello all, Right! After snapping my second magura lever I got a replacement.... Just need to fit everything and re-bleed....but once again the piston in the master cylinder will not run smoothly, I spent about 3hours today trying to find ways for it to run smooth! The last one I fixed went from being stuck to miracally popping out and running smooth after a couple of hours in wd40...this time it hasn't seemed to work. Any ideas?? What is the correct way to install the piston? Steve-o Quote Link to comment Share on other sites More sharing options...
Bigman Posted April 28, 2010 Report Share Posted April 28, 2010 I have had this problem a few times, I usualy ended up having to change the piston to be honest dude Adam Quote Link to comment Share on other sites More sharing options...
charliemod Posted April 28, 2010 Report Share Posted April 28, 2010 (edited) Iv'e had this problem as well, I put a bit of wd 40 on the plastic piston thing and it moved with out a problem. hope it works for you, (if you try it) edit oh didnt read the last bit :$ still it usually works but if not probably need a new one like big man said. Edited April 28, 2010 by charliemod Quote Link to comment Share on other sites More sharing options...
JT! Posted April 28, 2010 Report Share Posted April 28, 2010 Do you have the tpa adjusted right off when you're bleeding the brake? Quote Link to comment Share on other sites More sharing options...
Alex Dark Posted April 28, 2010 Report Share Posted April 28, 2010 Very fine sandpaper.....800 grit/1000....take o-ring off then evenly sand the piston down slightly. Rinse in water and try fitting. Always worked perfectly for me Quote Link to comment Share on other sites More sharing options...
STEVE-0 Posted April 28, 2010 Author Report Share Posted April 28, 2010 Do you have the tpa adjusted right off when you're bleeding the brake? Yep... the sanding option looks my only hope at the minute, shouldn't be necessary though....why would the piston need replacing? It's not like it's worn inside the lever.... Steve-o Quote Link to comment Share on other sites More sharing options...
STEVE-0 Posted April 29, 2010 Author Report Share Posted April 29, 2010 This is what someone replied with from the Magura Forum: Hi Steve, the brake should lube itself, so essentially all you'd have to do to keep it running smooth is just use the brake. Apparently this doesn't work in your case. Has the piston always been running heavily or is it something that developed over time? You could have your mechanic take a look at it as my hint above doesn't work for you. But by no means remove the piston as you won't be able to properly reinstall it. It has a lip seal that will flip if you try. If your piston already come out, you could give it a shot by rotating the piston while you insert it, as if you thread it in like a bolt. Still, chances of success are very small. Cheers, Vinay Quote Link to comment Share on other sites More sharing options...
AdamR28 Posted April 29, 2010 Report Share Posted April 29, 2010 This is what someone replied with from the Magura Forum: Fail. Very fine sandpaper.....800 grit/1000....take o-ring off then evenly sand the piston down slightly. Rinse in water and try fitting. Always worked perfectly for me Win. Quote Link to comment Share on other sites More sharing options...
PeanuckleJive Posted April 29, 2010 Report Share Posted April 29, 2010 This is what someone replied with from the Magura Forum: If you're using a water bleed it doesn't lube itself. Is it water bled? Quote Link to comment Share on other sites More sharing options...
Alex Dark Posted April 29, 2010 Report Share Posted April 29, 2010 Fail. (Alex Dark) Win. Wooo ... Tarty endorsement Quote Link to comment Share on other sites More sharing options...
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