Maxx Posted March 26, 2013 Report Share Posted March 26, 2013 Hi, everytime I bleed HS33's with Magura Blood after they were bleed/used with antifreeze (without problems), lever piston get stuck and give a bad feeling ! Even the bleed syringe get stuck. I think that's seals (it's like increasement of friction), but why ? Is there a reaction between mineral oil/antifreeze which cause this ? (I don't want to know how to fix that, just want to know why it happened) Quote Link to comment Share on other sites More sharing options...
trialsiain Posted March 26, 2013 Report Share Posted March 26, 2013 It could be the plastic lever piston has swelled up you have to remove it then remove the rubber oring and sand a tiny bit off Quote Link to comment Share on other sites More sharing options...
Maxx Posted March 26, 2013 Author Report Share Posted March 26, 2013 Maybe I didn't explain it very well but : My brake was bleed with antifreeze. It worked really good, good feeling/response. Then I bleed it with Magura Blood : it becomes almost instantly shit (and I know how to bleed, taht's not the problem) So I don't think piston swelled up in not even 5 minutes. Quote Link to comment Share on other sites More sharing options...
trialsiain Posted March 26, 2013 Report Share Posted March 26, 2013 Maybe I didn't explain it very well but : My brake was bleed with antifreeze. It worked really good, good feeling/response. Then I bleed it with Magura Blood : it becomes almost instantly shit (and I know how to bleed, taht's not the problem) So I don't think piston swelled up in not even 5 minutes. ah right if you dont get all the water out it usually mixes and turns into white sludge Quote Link to comment Share on other sites More sharing options...
Danny00135 Posted March 26, 2013 Report Share Posted March 26, 2013 ah right if you dont get all the water out it usually mixes and turns into white sludge Wrong word there man... Don't really understand what you mean, but if it feels like there's increased resistance in the brake, then that could jus be the nature of using oil, given it's more viscous than antifreeze/water. Quote Link to comment Share on other sites More sharing options...
Revolver Posted March 26, 2013 Report Share Posted March 26, 2013 You really need to make sure the brake is empty. Open the bleed ports, wind out the TPA, pump the lever and make sure everything is out, and then leave it for a bit to dry. Then you can start bleeding it with oil. You could try bleeding it hard with water to clear the sludge and then letting it dry out, that might clear the sludge. Quote Link to comment Share on other sites More sharing options...
Maxx Posted March 27, 2013 Author Report Share Posted March 27, 2013 Don't really understand what you mean, but if it feels like there's increased resistance in the brake, then that could jus be the nature of using oil, given it's more viscous than antifreeze/water. No that's not the viscosity of oil, it is like the seal were dry, sorry I don't explain very well. Like a swollen piston but that's not (unless if antifreeze/oil mixture produce a reaction which make the piston to swell rapidly, because as I said, 2 minutes before the oil bleed the brake was fine) Why do I need to make the brake empty ? I've never do this when bleeding from oil to antifreeze (the inverse) and never have any problems. Quote Link to comment Share on other sites More sharing options...
Revolver Posted March 27, 2013 Report Share Posted March 27, 2013 Just to make sure it's clear, as a precaution. 1 Quote Link to comment Share on other sites More sharing options...
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