chromeshee Posted July 14, 2004 Report Share Posted July 14, 2004 i feel stupid asking but i have tried everthing.i have a 89 shee i am rebuilding from frame up for a guy.i was putting the front brake system back together as usuaul. i cant get them to build any pressure. i have changed 3 master cylinders,cleaned the lines several times.i changed the metal lines and the top divider block and line.i have gotten all the air out. i can pump the brake 15-20 times and crack the bleeder and the fluid dribbles out. if you pump it up and dont bleed ,and then just let lose of the handle the fluid squirts back up through the master cylinder.that makes me think it clogged somewhere,but i have cleaned several times! has anybody ever ran into this? i have built several shees and never seen this happen Quote Link to comment Share on other sites More sharing options...
sredish Posted July 14, 2004 Report Share Posted July 14, 2004 i feel stupid asking but i have tried everthing.i have a 89 shee i am rebuilding from frame up for a guy.i was putting the front brake system back together as usuaul. i cant get them to build any pressure. i have changed 3 master cylinders,cleaned the lines several times.i changed the metal lines and the top divider block and line.i have gotten all the air out. i can pump the brake 15-20 times and crack the bleeder and the fluid dribbles out. if you pump it up and dont bleed ,and then just let lose of the handle the fluid squirts back up through the master cylinder.that makes me think it clogged somewhere,but i have cleaned several times! has anybody ever ran into this? i have built several shees and never seen this happen that sounds weird. technically, it's not wrong for the fluid to come back up into the reservoir after you let off of the lever. your keeping plenty of fluid in the reservoir, correct, and your not letting any air into the bleeder before you close it, correct? i'm trying to think what else it would be. i'll get back. Quote Link to comment Share on other sites More sharing options...
chromeshee Posted July 14, 2004 Author Report Share Posted July 14, 2004 THANKS FOR THE REPLEY,AND YEA I HAVE DONE ALL OF THAT Quote Link to comment Share on other sites More sharing options...
sredish Posted July 14, 2004 Report Share Posted July 14, 2004 THANKS FOR THE REPLEY,AND YEA I HAVE DONE ALL OF THAT how long do you pump the air out before you make a change, like change the res, or the hoses? It can take a while, and do you visually see air coming out, even after a lot of pumps? Quote Link to comment Share on other sites More sharing options...
chromeshee Posted July 14, 2004 Author Report Share Posted July 14, 2004 (edited) i always put clear fuel line on the end of the bleeder,that way i can see if there is any air,and when all the air is gone it still wont pump up. i worked on this thing for 6 hours today,it is beating me and i dont usually give up on anything! Edited July 14, 2004 by chromeshee Quote Link to comment Share on other sites More sharing options...
zilladude Posted July 14, 2004 Report Share Posted July 14, 2004 You might have to reverse flush/bleed the system. Use a syringe full of brake fluid at the bleeder to push the air up to the master. It is messy but this really works good. Quote Link to comment Share on other sites More sharing options...
DUNEDEMON Posted July 14, 2004 Report Share Posted July 14, 2004 Get yourself a "Mity-Vac" hand held vaccum pump, loosen 1 bleeder, attach the pump, pump it to create the vaccum - thus drawing the fluid through the line. Easiest way I know of, has never let me down. Most auto parts places sell them, and they're cheap, less than $30. Good luck, and let us know how it turns out. Quote Link to comment Share on other sites More sharing options...
Brian G Posted July 14, 2004 Report Share Posted July 14, 2004 Leave the bleeder screws open over night with the cap res cap off they will gravity bleed themselves usually but you do have a air bubble somewhere. Quote Link to comment Share on other sites More sharing options...
chromeshee Posted July 14, 2004 Author Report Share Posted July 14, 2004 thanks for the help guys, i have already tried pulling a vacum on it,i have been doing that for years also and its never let me down either until now. i did leave the bleeders open last night but havent tried it yet. i havent replaced the bottom rubber lines or calipers,is there any way they could be bad? the bike was mostly apart before i started so i dont know if the worked before, thanks again please keep thinking Quote Link to comment Share on other sites More sharing options...
chromeshee Posted July 15, 2004 Author Report Share Posted July 15, 2004 THANK THE LORD!! i finally got it.i got to looking at it and the bleeder on them old style calipers is pointed out instead of straight up like the 91 and up ones.i took them off and held them up and tapped them with a rubber mallet and blead them till finally all the air started coming out.it still took awhile and a lot of tapping and moving around to get all the air out. maybe this will help someone else,thanks for the help guys Quote Link to comment Share on other sites More sharing options...
MotulMonsta Posted July 15, 2004 Report Share Posted July 15, 2004 I was about to say..the older calipers hold air..I had the same issues when I changed over to braided brake lines..took me 3 days to bleed all the air out..I though my master cylinder crapped itself. Quote Link to comment Share on other sites More sharing options...
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