IROOST1 Posted November 16, 2006 Report Share Posted November 16, 2006 OK, I have tried everything to get these brakes to bleed. My front brake just wont build pressure. I have tried using a longer screw on the lever. The master is rebuilt. I have done everything i can think of. I dont have any air coming out of the bleeders. Just fluid. There is just no pressure building at all. What could be wrong. I have tried clamping the rubber lines to see where its not pressurizing and that doesnt work. If i clamp the rubber line just off the master, it doesnt pressurize. Does anyone know if this is right. When i pull the lever in, the fluid in the master goes up, then when i let go of the lever, it goes back down????????? What the hell should i do? I have another set of brakes and stainless lines, but i dont really want to use them on this shee. Quote Link to comment Share on other sites More sharing options...
g-force Posted November 16, 2006 Report Share Posted November 16, 2006 i had trouble bleeding mine also. i put a hose on the bleeder valve and submerged it in brake fluid and just left it, adding fluid to the master cylinder occasionally and then just did the normal bleeding process. Quote Link to comment Share on other sites More sharing options...
mavbike Posted November 16, 2006 Report Share Posted November 16, 2006 OK, I have tried everything to get these brakes to bleed. My front brake just wont build pressure. I have tried using a longer screw on the lever. The master is rebuilt. I have done everything i can think of. I dont have any air coming out of the bleeders. Just fluid. There is just no pressure building at all. What could be wrong. I have tried clamping the rubber lines to see where its not pressurizing and that doesnt work. If i clamp the rubber line just off the master, it doesnt pressurize. Does anyone know if this is right. When i pull the lever in, the fluid in the master goes up, then when i let go of the lever, it goes back down????????? What the hell should i do? I have another set of brakes and stainless lines, but i dont really want to use them on this shee. Bike brakes are funny. If you bleed them too fast, the air almost foams in the fluid. Nothing you can do but walk off and let the air settle. I use a vacuum bleeder, wiith just 5psi vacuum, and go real slow. I use clear tubing so I can see what is comming out. If you are sure you have all the air out and still not working, may need to rebuild the master cylinder. Usualy you can take it apart and check the rubber seals. There will be a round rubber puck in there that pushes the fluid. Most of the time, if it is bad, you can see on the edges where it has folded, or it will look pitted and scratched on the edge. Quote Link to comment Share on other sites More sharing options...
David Keith Posted November 17, 2006 Report Share Posted November 17, 2006 OK, I have tried everything to get these brakes to bleed. My front brake just wont build pressure. I have tried using a longer screw on the lever. The master is rebuilt. I have done everything i can think of. I dont have any air coming out of the bleeders. Just fluid. There is just no pressure building at all. What could be wrong. I have tried clamping the rubber lines to see where its not pressurizing and that doesnt work. If i clamp the rubber line just off the master, it doesnt pressurize. Does anyone know if this is right. When i pull the lever in, the fluid in the master goes up, then when i let go of the lever, it goes back down????????? What the hell should i do? I have another set of brakes and stainless lines, but i dont really want to use them on this shee. If you don't have a vacuum pump, you can always make an aluminum adapter to fit ontop of your resevoir. Then, you can apply less than 10 psi of air pressure to the resevoir. Pulling the brake lever back & forth then will push out the trapped air. This is called a "power bleed". I have several different plates like this that have a 1/4 inch NPT tapped hole to input air. PM me if you want more details. Quote Link to comment Share on other sites More sharing options...
IROOST1 Posted November 17, 2006 Author Report Share Posted November 17, 2006 Bike brakes are funny. If you bleed them too fast, the air almost foams in the fluid. Nothing you can do but walk off and let the air settle. I use a vacuum bleeder, wiith just 5psi vacuum, and go real slow. I use clear tubing so I can see what is comming out. If you are sure you have all the air out and still not working, may need to rebuild the master cylinder. Usualy you can take it apart and check the rubber seals. There will be a round rubber puck in there that pushes the fluid. Most of the time, if it is bad, you can see on the edges where it has folded, or it will look pitted and scratched on the edge. I did rebuild the master so that isnt it, and i have tried two other masters, with the same problem. I guess i will drill an extra brake cap i have and put presure to it to see if that works. Quote Link to comment Share on other sites More sharing options...
icprey Posted November 19, 2006 Report Share Posted November 19, 2006 I did rebuild the master so that isnt it, and i have tried two other masters, with the same problem. I guess i will drill an extra brake cap i have and put presure to it to see if that works. I had and the same problem and like you tried three diffrent masters and even bled each junction off working downwards but the damn thing wouldn't push the fluid down. I have a tool that allows you to suck fluid through the bleeder at the caliper and that did the trick finally. Still not thrilled with final lever feel and play, but it's bled the best I can. Quote Link to comment Share on other sites More sharing options...
IROOST1 Posted November 19, 2006 Author Report Share Posted November 19, 2006 I had and the same problem and like you tried three diffrent masters and even bled each junction off working downwards but the damn thing wouldn't push the fluid down. I have a tool that allows you to suck fluid through the bleeder at the caliper and that did the trick finally. Still not thrilled with final lever feel and play, but it's bled the best I can. Is it called a mity vac. I have the one that hooks on the resivoir but it for a car so it wont work. I guess i have to go to harbor frieght and see if they have the vaccum one. Quote Link to comment Share on other sites More sharing options...
DVS1 Posted November 20, 2006 Report Share Posted November 20, 2006 It took me over 2 hrs cycling the break lever to finally build pressure. I had the master cap off, kept fluid damn near full, and every cycle of the lever would cause a tiny bubble to come up out of the line and slowly the fluid level would go down. I mean a tiny ass bubble too, but I just kept cycling and eventually no more bubbles and the lever built pressure. I just had to keep going well beyond the point of "this is fucking bullshit". Quote Link to comment Share on other sites More sharing options...
ClimbAnyHill Posted November 20, 2006 Report Share Posted November 20, 2006 John @ Sandtoyz Unlimited said he leaves the res cap off over night. Air bubble rise out of the brake lines and ready to go in the morning. Quote Link to comment Share on other sites More sharing options...
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