Concussion Posted May 5, 2008 Report Share Posted May 5, 2008 After bleeding my brake last week (TPA wound out while bleeding!) I noticed I have to wind my TPA in quite a bit to get rid of any play in the lever.What is going on / how can I fix it? I'm feeling a bit stupid today and I have never taken a lever apart (or really want to) to see what's going on, all I know is it never used to be this bad? Youtube Video -> Original Video Quote Link to comment Share on other sites More sharing options...
dave85 Posted May 5, 2008 Report Share Posted May 5, 2008 Lever needs some more fluid in it, I should imagine. Any leaks anywhere? Quote Link to comment Share on other sites More sharing options...
Concussion Posted May 5, 2008 Author Report Share Posted May 5, 2008 It's like the piston doesn't come out enough, put a bit of lube in there but still the same. That is 5mins after a fresh bleed?Works fine (no leaks) with the TPA wound in loads but I like things to work perfectly. Quote Link to comment Share on other sites More sharing options...
dave85 Posted May 5, 2008 Report Share Posted May 5, 2008 In my experience with this style of lever (where there's no ridge in the cylinder to hold the piston in like the old maguras had) if the piston isnt coming out far enough, it needs more fluid in the system. Quote Link to comment Share on other sites More sharing options...
Concussion Posted May 5, 2008 Author Report Share Posted May 5, 2008 Thanks for the help!I'm gonna force some fluid through the system with the grub/lever screw left in, see if I can't force the piston out and do another bleed? Quote Link to comment Share on other sites More sharing options...
Krisboats Posted May 5, 2008 Report Share Posted May 5, 2008 Yep like edd said, looks like the pistons stuck and so theres not enough fluid to keep it pushed up against the pin thats attached to your tpa.If i were you first thing i'd be trying is bleeding with the grub screw still in like you suggested. Quote Link to comment Share on other sites More sharing options...
psycholist Posted May 5, 2008 Report Share Posted May 5, 2008 Try pumping the lever while bleeding fluid through the system. I had to do this before my master cylinder would fill when I was bleeding this type of brake. Older Maguras don't need half this messing, so I had to bleed mine a second time, pumping the lever before they worked ... Quote Link to comment Share on other sites More sharing options...
Bionic Balls Posted May 6, 2008 Report Share Posted May 6, 2008 could it be that the lever piston is just stuck down a little bit? i'v had them get a little seized....magura would not advise this...but try spraying a little gt85 into the lever (IE: the piston)...adam Quote Link to comment Share on other sites More sharing options...
Alex Dark Posted May 6, 2008 Report Share Posted May 6, 2008 i pushed mine out a bit further with an allen key through the bleed hole ( 04 style ) but i guess slightly overbleeding is your best option with an 05 Quote Link to comment Share on other sites More sharing options...
Concussion Posted May 6, 2008 Author Report Share Posted May 6, 2008 Looking for a little more advise please!I forced some fluid through the system with the grub screw still in place, the lever/piston moved out, all looking good. Did another bleed to be safe, pulled the lever and it didn't come back at all, now that is weird cause even when there is air in the system the lever returns. Did the same thing all over again this time putting a bit of lube on the piston area... same result, lever/piston did not return ie: brakes locked on?I'm stuck... help! Quote Link to comment Share on other sites More sharing options...
Alex Dark Posted May 6, 2008 Report Share Posted May 6, 2008 (edited) Looking for a little more advise please!I forced some fluid through the system with the grub screw still in place, the lever/piston moved out, all looking good. Did another bleed to be safe, pulled the lever and it didn't come back at all, now that is weird cause even when there is air in the system the lever returns. Did the same thing all over again this time putting a bit of lube on the piston area... same result, lever/piston did not return ie: brakes locked on?I'm stuck... help! ive had this problem before.....best thing you can do is get the piston out, sounds like a bit of grit was stopping the piston coming up all the way when you bled it when you over bled it the piston would have hit the obstruction and dragged it down, causing excess friction and stopping the piston coming back up....Clamp the slaves ( with pads ) in a vice or with mole grips...., now remove lever blade and tpa.....then attach a syringe and bleed kit and force water in....this should force the master piston out the top of the lever body, you can then clean both and stretch the spring slightly Edited May 6, 2008 by Alex Dark Quote Link to comment Share on other sites More sharing options...
Concussion Posted May 6, 2008 Author Report Share Posted May 6, 2008 Thanks, I'll take it apart and give it a good going over. Sunny day as well, wanted to ride... gutted! God I wish I had a V-brake sometimes Quote Link to comment Share on other sites More sharing options...
Alex Dark Posted May 6, 2008 Report Share Posted May 6, 2008 Thanks, I'll take it apart and give it a good going over. Sunny day as well, wanted to ride... gutted! God I wish I had a V-brake sometimes thats cool, if you need any help or get stuck, drop me a pm dude Quote Link to comment Share on other sites More sharing options...
RossMcd Posted May 6, 2008 Report Share Posted May 6, 2008 this is what i used to do but i wouldnt advise it to be honestI used to take the piston out of the lever, give the spring a little strech and put it back together.i rather the 04 levers as they are easier to bleed Quote Link to comment Share on other sites More sharing options...
Concussion Posted May 6, 2008 Author Report Share Posted May 6, 2008 In the process of doing that now mate. There was some gunk in there, but nothing to bad. God I hope this works!...anyone still sell 04 levers? (he says without checking) Quote Link to comment Share on other sites More sharing options...
jsy trials matt Posted May 6, 2008 Report Share Posted May 6, 2008 air bubbles probley Quote Link to comment Share on other sites More sharing options...
Concussion Posted May 6, 2008 Author Report Share Posted May 6, 2008 All for future reference... The piston is incredibly tight when I try to get it back in the lever body, been advised to sand the piston slightly, lube it and try again.Thanks to Adam and Ali for all the advise as well! Quote Link to comment Share on other sites More sharing options...
Ryan Blackwell Posted May 6, 2008 Report Share Posted May 6, 2008 Right i think this will work, take the leaver blade off, put the leaverbody under water and remove the bleed bolt and pump the piston with an old alen key or somthing for a while then do the bolts up but the leaver back and give that a try. Quote Link to comment Share on other sites More sharing options...
Concussion Posted May 6, 2008 Author Report Share Posted May 6, 2008 Sorted!I noticed the piston had a really slight groove down one side, I lined it up with the line on the lever body where the two halves join and it worked fine.So for future reference, the piston chamber in not perfectly round, nor is the piston, they have to be aligned... dunno how it got twisted... the end! Quote Link to comment Share on other sites More sharing options...
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