Topsy Posted August 14, 2013 Report Share Posted August 14, 2013 Hello guys At the moment I'm experiencing a strange problem with my Hs33 lever piston. I'm running a waterbleed and since I bled it last time the lever piston won't return properly when the leverbody is in the sun! The lever will slowly start to feel harder and harder to pull in the sun (+30°c ), and after three or four minutes it will nearly seize up totally whilst retracting, leaving lot's of 'play' in the lever. I then did a test with a coolpack to see if it really is the lever piston on not the master & slave at the rim causing it, and it is. After being under the coolpack for 30secs it all works fine again.. Did a small video incase I'm not explaining it well enough. And yes, it was edited on my phone... Anyone know this behaviour and what could be causing it? Thanks! Edit: The leverbody does not really feel hot yet when it starts to seize up in the sun. Quote Link to comment Share on other sites More sharing options...
bing Posted August 14, 2013 Report Share Posted August 14, 2013 My 04 lever does this Quote Link to comment Share on other sites More sharing options...
Topsy Posted August 14, 2013 Author Report Share Posted August 14, 2013 yeah, forgot to add, mines an 04 too. Didn't do it last year though. Quote Link to comment Share on other sites More sharing options...
SamKidney Posted August 14, 2013 Report Share Posted August 14, 2013 Swollen piston/dodgy bleed. My rear 05 did this until I bled it (hadn't been bled since purchase) and it was full of a mix of water and oil as it hadn't been bled properly previously. Quote Link to comment Share on other sites More sharing options...
dann2707 Posted August 14, 2013 Report Share Posted August 14, 2013 Swollen piston. Quote Link to comment Share on other sites More sharing options...
FamilyBiker Posted August 14, 2013 Report Share Posted August 14, 2013 most asked question ever! but:sand down your piston a tiny little bit,should work-and a rebleed is never a bad thing,except for 2011s maggies lol Quote Link to comment Share on other sites More sharing options...
Topsy Posted August 15, 2013 Author Report Share Posted August 15, 2013 ha, didn't notice that was a common problem, thanks guys! Stil can't quite get my head round why it changes depending on a small temperature increse though.. Quote Link to comment Share on other sites More sharing options...
dk2 Posted August 15, 2013 Report Share Posted August 15, 2013 almost all materials expands/shrinks with temperature... Quote Link to comment Share on other sites More sharing options...
Canardweb Posted August 15, 2013 Report Share Posted August 15, 2013 My piston is still stuck at the bottom of the body. It's impossible to get it out! Quote Link to comment Share on other sites More sharing options...
AdamR28 Posted August 15, 2013 Report Share Posted August 15, 2013 Bleed hose and a track pump should get it out. Our 'record' is 120psi, haha. Quote Link to comment Share on other sites More sharing options...
Ross McArthur Posted August 15, 2013 Report Share Posted August 15, 2013 That was the beauty of the 04s, you could push the piston out with something long and thin. Ive tried sanding down the piston before but does anyone sand the inside of the lever too? Use a dremel bit? Quote Link to comment Share on other sites More sharing options...
dann2707 Posted August 15, 2013 Report Share Posted August 15, 2013 That was the beauty of the 04s, you could push the piston out with something long and thin. Ive tried sanding down the piston before but does anyone sand the inside of the lever too? Use a dremel bit? Why would you want to do that though? It's the piston that swells not the metal lever body changing shape. If you widen the bore it would just leak as it's not forming a seal? Quote Link to comment Share on other sites More sharing options...
Canardweb Posted August 15, 2013 Report Share Posted August 15, 2013 Bleed hose and a track pump should get it out. Our 'record' is 120psi, haha. It just doesn't get out, tried that with an electric compressor... Quote Link to comment Share on other sites More sharing options...
AdamR28 Posted August 15, 2013 Report Share Posted August 15, 2013 What pressure does the compressor run to though? Quote Link to comment Share on other sites More sharing options...
Blake Posted August 15, 2013 Report Share Posted August 15, 2013 I've never managed to use a pump successfully Quote Link to comment Share on other sites More sharing options...
Ross McArthur Posted August 15, 2013 Report Share Posted August 15, 2013 Maybe polishing the inside would be a better idea. 1 Quote Link to comment Share on other sites More sharing options...
dann2707 Posted August 15, 2013 Report Share Posted August 15, 2013 I've never managed to use a pump successfully I have and nearly took my uni mates eye out with the piston haha. Put a cloth over the end to lower the velocity! Quote Link to comment Share on other sites More sharing options...
Canardweb Posted August 15, 2013 Report Share Posted August 15, 2013 What pressure does the compressor run to though? I don't think there was a nanometer on it. But it's a professionnal one a friend uses at his job. Quote Link to comment Share on other sites More sharing options...
AdamR28 Posted August 15, 2013 Report Share Posted August 15, 2013 Maybe polishing the inside would be a better idea. I looked into this, apparently if it's too smooth that causes sealing issues. I have and nearly took my uni mates eye out with the piston haha. Put a cloth over the end to lower the velocity! Haha. Definitely worth doing, yep. I don't think there was a nanometer on it. But it's a professionnal one a friend uses at his job. It may well be a high volume, low pressure system in that case. We've never seen it not possible with a track pump So it'll be worth a shot. Quote Link to comment Share on other sites More sharing options...
Canardweb Posted August 15, 2013 Report Share Posted August 15, 2013 Ok thanks but I managed another way. I left them in the freezer tonight. This morning I just got them out and tried with a handpump and a Bleed hose. Both just popped out with nearly no pressure. It's almost as if they were brand new... Quote Link to comment Share on other sites More sharing options...
Ross McArthur Posted August 15, 2013 Report Share Posted August 15, 2013 Until it thaws Quote Link to comment Share on other sites More sharing options...
Blake Posted August 15, 2013 Report Share Posted August 15, 2013 Does it make a loud noise when it pops out? Quote Link to comment Share on other sites More sharing options...
AdamR28 Posted August 15, 2013 Report Share Posted August 15, 2013 Yes. Quote Link to comment Share on other sites More sharing options...
Blake Posted August 15, 2013 Report Share Posted August 15, 2013 Adam I'm scared hold me Quote Link to comment Share on other sites More sharing options...
AdamR28 Posted August 15, 2013 Report Share Posted August 15, 2013 Just wrap it in a cloth, be reet Quote Link to comment Share on other sites More sharing options...
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