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I had a helluva time bleeding the front breaks on both of my softails when I switched out the cables. Tried the gravity method which I found online somewhere and the vacuum method. Still couldn't get all the air of the line. Low break lever and spongy.
I finally resorted to a trick recommended by someone here. Here's how I remember it: Remove master cylinder cap, pull break lever back and secure in that position. Turn handlebars so the master cylinder side is higher than the other. Leave like that overnight. In the morning let break lever out and give it a single short squeeze to burp the line. You may see a bubble rise to the surface. I had to do this for about 3 nights to get all the air out. Even then the lever still didn't feel just right. After I rode it a few times I noticed it had hardened up real good.
I have no idea why I had such a hard time getting the air out. Hopefully, you'll have better luck.
Hey Bro. Everyone had some great ideas, but I wanted to go the cheap route first and see if your method worked. I did it last night and the improvement in the brake is dramatic. I get it half way down now and can't go any further. I am going to do it again tonight. I just strap it with an elastic tie strap and leave the cover off. Then I burped it. amazing.
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