Brakes Lever Pulls Flat

Energy One

BadDawg Bill

Well-Known Member
Thank a lot Bill, it sounds like good advice but its going to keep me from riding since I don't wrench it myself it will take a while. Since it is my front brake I cannot just do without it. But it seems no answer is obvious. Thanks again for your time. Tony
Hey, rebuilding the master is duck soup even Kevin can do it.... Changing a line is simple too if you have the vacuum bleeder. Why not try it and maybe you will surprise yourself and get more confidence and know your dog better... You can still ride with just a rear brake just take it easy..... I rode a chopper for years without a front brake... and a custom for a year without a back brake...
 
Hey, rebuilding the master is duck soup even Kevin can do it.... Changing a line is simple too if you have the vacuum bleeder. Why not try it and maybe you will surprise yourself and get more confidence and know your dog better... You can still ride with just a rear brake just take it easy..... I rode a chopper for years without a front brake... and a custom for a year without a back brake...
Bill, you make me want to try it. However, I have a lousy track record when it comes to fixing things in general. I might give it a try..I always wind up losing something or breaking it. I hate not being able to do it myself, so your right I should give it a try but it sounds like it will be any number of things. Even with the Master, if its not leaking, which it never has before, I don't see where the air would get in since as you point out it is a closed system. However, in the end result your story of what you went through to finally get your problem solved says that it could be any of the components. So if I understand you I should start with the master and then the line itself. Thanks for your help..Tony
 

BWG56

Guru
There is a vent hole in the cover, right behind the mirror stem, and if the seal is gasket is bad the leak could be coming from there

IMG_1422.JPG
 
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PROFLYER

SWOLE
Lifetime Supporting Member
Supporting Member
Rebuild the master, rebuild the caliper. Both very easy and cheap. Then refill and properly bleed it. $53 worth of parts.

Master: http://www.wildsteedworx.com/index.php?main_page=product_info&cPath=65_68_173_74_273_320_321&products_id=1530
Caliper: http://www.wildsteedworx.com/index.php?main_page=product_info&cPath=65_68_173_74_273_320_322&products_id=1179

If you can't rebuild these yourself your shop certainly can. Find the dropbox link for the 08 service manual and you'll see how to do it. If not maybe another member lives near you and can help?
 

bdm7250

Guru
Lifetime Supporting Member
Supporting Member
Rebuild the master, rebuild the caliper. Both very easy and cheap. Then refill and properly bleed it. $53 worth of parts.

Master: http://www.wildsteedworx.com/index.php?main_page=product_info&cPath=65_68_173_74_273_320_321&products_id=1530
Caliper: http://www.wildsteedworx.com/index.php?main_page=product_info&cPath=65_68_173_74_273_320_322&products_id=1179

If you can't rebuild these yourself your shop certainly can. Find the dropbox link for the 08 service manual and you'll see how to do it. If not maybe another member lives near you and can help?
Dropbox link..
https://www.dropbox.com/home/Big Dog
 

Lorenzo

Active Member
Greetings.
I have had a problem with my 08' K9 front brake that has gone on for a long time with no one having a solution. Apprantley, it always gets air in the line, then I take it to the shop and they bleed it and its okay for about 500-1000 miles at best and then it starts by losing the lever a little at a time until eventually it will go to zero and I will have no front brakes at all.

Most recently they even put on new pads (the old ones still had pad) and new fluid (I have ran through a lot of fluid here over the years) and I had a full lever. Now it is once again starting the same trick as it starts out gradual until it progresses to zero brakes. The only thing new this time is that it is leaking out fluid. The first time it leaked out was with the handle bars turned around and now it is just leaking out drops around the bottom but still leaking. I know they tried to get in as much fluid as possible likely over filling.

Realize that the shop is doing this not me as I don't know what to do about it and have no solution. Any help or suggestions would be greatly appreciated. I feel certain I am not the only one who has had this problem?

Thank you, T.
If youd like call me. i had the same problem and found the issue. 254-338-2066
 

Lorenzo

Active Member
The Master cylinder and system is a closed system. The reason the calipers work is because of the pressure pushing the fluid through the line. Any tiny leak (whether) it leaks fluid or air will cause failure. A tiny/loose fitting or seal could allow air in but not big enough to push fluid out and if fluid comes out it's a Major problem and leak.

I spent months trying to fix my back brake once and changed everything (all at once) and still had no brake after a few stops. The problem was the T fitting at first but then when I replaced that the line going into it sucked in air and I had the same problem. I replaced the line and still had the problem. I could go on and on but after starting at the master cylinder and making sure it was good/sealed and following everything all the way down the line and trying it after each change I finally got a brake.
Yes it is a sealed system but i had the exact same problem not to long ago. Long story short, it was not a simple find. I found out that the PM calipers you can split them to do a rebuild, which is only 4 piston cup seals and 2 very small "O" rings. That was the problem, the 2 "O" rings in between the calipers when you split them apart, on one half there is a recess and small hole and other one is just a small hole. that's how the fluid passes between the halves. My calipers have never been split apart but the "O" rings wore out and seeped. As said by one of the other posters, no matter how small a leak or seep, if it comes out, air gets in. Sorry for the long post, JMO
 
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