Bionic Balls Posted February 1, 2005 Report Share Posted February 1, 2005 I went for a particularly muddy and wet ride on sunday and my bike turned into a big brown cake. Of course, my brakes went terrible.... Cleaned the mud off and regreased some bearings but my rear brake (magura hs33) moves really slowly and is almost always on (because the slave comes out but doesn't move back! I've tried putting bike spray all over the piston, and i've rebled it, but the slave is still really slow. I've taken the slaves off and filled them with bikespray to try and loosen them up a bit....but when i pull the piston out with pliers it is still really stiff and moves back pretty slowly. I've been running it on water and its been fine for about a year....the brake is about 3 years old in total- is it knackered? I wondered if i can actually take the piston out to give it a right good cleaning up? Can i do that? how? any other ideas? cheers, adam Quote Link to comment Share on other sites More sharing options...
quick_spider Posted February 1, 2005 Report Share Posted February 1, 2005 You can't take the slave cylinders apart easily. I'd suggest you setup your brake properly. Lazy cylinders are made worse by too much TPA. Use 2p coins between the pads and the rim while you set the brake up. Jon Quote Link to comment Share on other sites More sharing options...
Trials Punk Posted February 1, 2005 Report Share Posted February 1, 2005 Try using some penatrate on it. Its thinner than water. It may loosen it up, other than that I have no idea. Quote Link to comment Share on other sites More sharing options...
nb88 Posted February 1, 2005 Report Share Posted February 1, 2005 Just give them a reeeeeet good clean and make sure its all lubed and well bled. If that doesnt work just get a new slave cylinder. I've got about 5 in my garage if you want one. Noz. Quote Link to comment Share on other sites More sharing options...
JT! Posted February 1, 2005 Report Share Posted February 1, 2005 Lazy cylinders are made worse by too much TPA. ← Agreed. Re-bleeding dosn't do anything. (Or it shouldnt). Have no TPA, and set the brakes up again. (Y) (Y) Quote Link to comment Share on other sites More sharing options...
Shaun H Posted February 1, 2005 Report Share Posted February 1, 2005 Agreed. Re-bleeding dosn't do anything. (Or it shouldnt). Have no TPA, and set the brakes up again. (Y) (Y) ← It will if the water is full of gritty mud that may have found it's way in. Quote Link to comment Share on other sites More sharing options...
JT! Posted February 1, 2005 Report Share Posted February 1, 2005 It will if the water is full of gritty mud that may have found it's way in. ← How can that be possible, when its a sealed system. (Y) Quote Link to comment Share on other sites More sharing options...
Shaun H Posted February 1, 2005 Report Share Posted February 1, 2005 How can that be possible, when its a sealed system. (Y) ← Something could be loose I dunno. But seeing as it's bled with the water the seals aren't guaranteed against it so you never know. Quote Link to comment Share on other sites More sharing options...
Bionic Balls Posted February 1, 2005 Author Report Share Posted February 1, 2005 thanks for the replies......"Re-bleeding dosn't do anything. (Or it shouldnt). Have no TPA, and set the brakes up again." that doesn't help- TPA or not...pistons move (in) real slowly. hopefully when i get home tonight the bike spray will have worked some magic...it's been in it since this morning. adam Quote Link to comment Share on other sites More sharing options...
Fishwog Posted February 1, 2005 Report Share Posted February 1, 2005 No he means that over time, excessive use of the TPA will affect the cylinders (Y) (Y) Quote Link to comment Share on other sites More sharing options...
AdamR28 Posted February 1, 2005 Report Share Posted February 1, 2005 Quick guide - this never fails when done correctly. Attach a bleed pipe to the slave cylinder, and put the pipe into the presta fitment of a track pump, or an air line. Remove bleed screw from the lever. This bit can get messy, go slow at first, and then use a rag to catch all the flying fluid/water: blast air through the system to clean it all out nicely. When this is done, put a couple of drops of chain lube on the seals in your lever, pull it a few times to work the lube around, and then wipe off the excess. Turn all TPA off. Re-bleed with water/water-antifreeze mix. When its all bled correctly, put the TPA fully on and depress the lever (elastic band (Y)" ). Push one of the slave pistons in by hand, and put a few drops of lube on the other one (WD40 also works ok). Then repeat for the other cylinder. Take the TPA off, remove elastic band, and pull the lever a few times to work the lube in. Wipe off the excess. If all done correctly, this will have your brake feeling better than new (Y) Quote Link to comment Share on other sites More sharing options...
Bionic Balls Posted February 1, 2005 Author Report Share Posted February 1, 2005 Thanks for the guide adam....i've already tried most of that (connected a pump and rebled + lubed pistons....the problem is the pistons. if i depress the lever, it is really hard to push one piston in if i wanted to get the other piston right out... (Y) they are just really stiff. the pump thing is fun! adam Quote Link to comment Share on other sites More sharing options...
Fishwog Posted February 1, 2005 Report Share Posted February 1, 2005 Thanks for the guide adam....i've already tried most of that (connected a pump and rebled + lubed pistons....the problem is the pistons. if i depress the lever, it is really hard to push one piston in if i wanted to get the other piston right out... :) they are just really stiff. the pump thing is fun! adam ← You think using a pump is fun? Try using an air compressor on it, and pulsing the trigger on it (Y) Probably not vry healthy for it thouh (Y) Quote Link to comment Share on other sites More sharing options...
Rago muffin Posted February 1, 2005 Report Share Posted February 1, 2005 my friend used elastcs bands, and it acaully work quite well hehe... Quote Link to comment Share on other sites More sharing options...
spider Posted February 1, 2005 Report Share Posted February 1, 2005 sorry but hey??? water in magura?????? water is less dens than oil isnt it? does it work??? (Y) Quote Link to comment Share on other sites More sharing options...
JT! Posted February 1, 2005 Report Share Posted February 1, 2005 sorry but hey??? water in magura?????? water is less dens than oil isnt it? does it work??? (Y) ← Some people say it works better. I think its a bit odd. But its suposed to feel different, and it dosn't cost anything! (Y) Quote Link to comment Share on other sites More sharing options...
Rago muffin Posted February 1, 2005 Report Share Posted February 1, 2005 water does acaully feel so much nicer then magura fluid (Y) Quote Link to comment Share on other sites More sharing options...
Trials Punk Posted February 1, 2005 Report Share Posted February 1, 2005 (edited) Water is alot better than standard Magura Blood. Stiffer and much easier to pull. Seems to return quicker too. Make sure if you ever use it use deionised water from most car type shops. Or if your clever like me get it out of your tumble drier. Edited February 1, 2005 by Trials Punk Quote Link to comment Share on other sites More sharing options...
BI-KING Posted February 1, 2005 Report Share Posted February 1, 2005 Lube up all the seals and re-bleed, always works for me (Y) PS: water is the way forward (Y) Quote Link to comment Share on other sites More sharing options...
Corish Posted February 2, 2005 Report Share Posted February 2, 2005 Agreed. Re-bleeding dosn't do anything. (Or it shouldnt). Have no TPA, and set the brakes up again. (Y) (Y) ← Mine did. Although I gave mine a proper good blow down with the Airline. made it work all time 'cos I always had to re-bleed it every day or so 'cos it kept going back to how it was before. corish Quote Link to comment Share on other sites More sharing options...
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