G-baby158 Posted August 1, 2008 Report Share Posted August 1, 2008 Hi all, ive used the search and nothing came up.I need to know how to bleed my front disk brake, i dont know anything about them.A guide with pic's would help or a discriptive text.Thanks Quote Link to comment Share on other sites More sharing options...
psycholist Posted August 1, 2008 Report Share Posted August 1, 2008 Bleed the system from bottom to top. Take the reservoir cover off - I think you need a T10 or T15 Torx bit for this, but a 1.5mm allen key will work too. Fit a syringe of oil to the bleed nipple at the caliper (Preferably remove all the air bubbles from the syringe first, same as with rim brakes) and open the bleed nipple with a spanner (Usually 1/4 to 1/2 turn should do it - if you're pressing the syringe you'll feel it as soon as the bleed nipple is open). Pump fresh fluid through until air bubbles stop appearing in the reservoir (Pump pretty quickly to help entrain bubbles in the flowing oil), close the bleed nipple, remove the syringe and try a few test pulls on the lever to see is it better. Try not to spill oil on the disk/pads (Or remove them before starting) and slap a rag or tissue around the lever to catch the overflowing oil. For the brake to be correctly filled the pistons in the caliper should be pushed back as far as possible into the caliper and there should be no air bubble in the reservoir - roll the diaphragm onto the reservoir, displacing fluid before putting the cap back on. Quote Link to comment Share on other sites More sharing options...
G-baby158 Posted August 2, 2008 Author Report Share Posted August 2, 2008 I dont know where the bleen nipple is? Quote Link to comment Share on other sites More sharing options...
totaltrials Posted August 2, 2008 Report Share Posted August 2, 2008 http://www.magura.com/7thsenseCMS/index.ph...d=13581&L=1Page 16. Quote Link to comment Share on other sites More sharing options...
psycholist Posted August 2, 2008 Report Share Posted August 2, 2008 I dont know where the bleen nipple is?The bleed nipple is on the brake caliper probably near where the brake line leaves the caliper for the lever. It'll probably have a rubber cap covering it which you pop off to get at the nipple itself. The tubing from the syringe should be a press fit over the bleed nipple so you can pump fluid into the brake. Quote Link to comment Share on other sites More sharing options...
G-baby158 Posted August 2, 2008 Author Report Share Posted August 2, 2008 The bleed nipple is on the brake caliper probably near where the brake line leaves the caliper for the lever. It'll probably have a rubber cap covering it which you pop off to get at the nipple itself. The tubing from the syringe should be a press fit over the bleed nipple so you can pump fluid into the brake.Ive bleed it, but from the lever i can hear air when i pull the lever what do you think it is ? Quote Link to comment Share on other sites More sharing options...
The Duck Posted August 3, 2008 Report Share Posted August 3, 2008 Ive bleed it, but from the lever i can hear air when i pull the lever what do you think it is ?Air in the gap where your brain should be.If you have managed to mess up after those crystal clear instructions your deserve a medal. Quote Link to comment Share on other sites More sharing options...
G-baby158 Posted August 3, 2008 Author Report Share Posted August 3, 2008 (edited) Air in the gap where your brain should be.If you have managed to mess up after those crystal clear instructions your deserve a medal. Edited August 3, 2008 by G-baby158 Quote Link to comment Share on other sites More sharing options...
psycholist Posted August 3, 2008 Report Share Posted August 3, 2008 If there's still air in the lever try pumping the lever slowly while pumping fluid through the brake - some levers have dead volume in them that isn't always filled by a normal bleed (The new HS33 levers are serious offenders on this one). Just be careful of brake fluid squirting out of the reservoir as you release the lever. Mineral oil is very safe, but I still wouldn't squirt it in my eyes... Quote Link to comment Share on other sites More sharing options...
G-baby158 Posted August 3, 2008 Author Report Share Posted August 3, 2008 I bleed it proply because it was working at first, i can hear air coming from the TPA goes into, i pulled it then after about 10 pulls the lever was hitting the handle bar. Quote Link to comment Share on other sites More sharing options...
psycholist Posted August 3, 2008 Report Share Posted August 3, 2008 Sounds like there's air being pumped into the system from the reservoir as you pull the lever. Are you leaving an air bubble in the reservoir after replacing the reservoir cap? Quote Link to comment Share on other sites More sharing options...
G-baby158 Posted August 3, 2008 Author Report Share Posted August 3, 2008 Sounds like there's air being pumped into the system from the reservoir as you pull the lever. Are you leaving an air bubble in the reservoir after replacing the reservoir cap?No. Quote Link to comment Share on other sites More sharing options...
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