WHO CAN TELL ME WHY??

[awg]

OK first of all I have had a low front brake lever for about a week now. No reason why. Fluid was good and clean.... So I decided to bleed them again. I moved the bars to the right as far as it will go to bleed it and to keep the fluid level. I have bled them every which way that has been mentioned here on the forum. Pump the lever until I'm blue in the face. Then with no luck I button it all up move the bars to the far left .... started pumping the lever again and it lever came right up and now all is good. Brakes grab right away now. How come? Its been a couple of weeks now and its still good. I don't get it.

 

[woodbutcher]

Wasn't holding your mouth right.

 

[Little-Boo]

I can "WHY" :lol: :lol:

Because you are not supposed to bleed them with the bars to the right, you may get fluid on the Gas Tank and you paint will turn into instant shit. :lol: :lol:

FYI if the lever or foot peddle goes down could be that you master cylinder is about to take crap on you. :2thumbs:

Carlos

 

[liferider]

Air bubble. It takes just a tiny tiny bubble and the fluid will compress in that air bubble instead of moving the calibers

 

[Sven]

At the end of your master is this bolt with a hole in it. At the end of the hose, there is this banjo looking thing. So the term 'banjo bolt' is that holed bolt, and inside that round body of the banjo, air sits up on that banjo or at the hose end.

By moving the bar, the air is going to run to the highest point. So watch the banjo at the one flop and the other side will show the banjo end at a higher angle. Just enough to send the bubble up the return hole in the master.

As rider stated, your pedal is going to be spongy, squeezing or compressing a bubble, not a solid.

The example is:
1. Ever see a ball sitting over a shop vac hose that is blowing air out and the ball spins and sits there?
2. Ever walk in a thai restaurant, see the bowling ball water fountain? The water pressure under the ball just spins the ball.
3. Ever put the two and two together and see the fluid dynamics as to why that bubble rolls at one stationary position locked at that angle? Put the 2 and 2 together and you move the bars and air is lighter than liquid?

Make sense as to the why this occurs?

 

[Nukeranger]

Could you have lost some brake fluid out of the vent hole? I lost some a couple of times and decided it could have been because I left my handle bars turned to the right for a long period of time (all day). I am only guessing because it never happened to me when the dog was parked with the handlebars turned to the left. All I did was add brake fluid and vent and roll on. I think the vent hole is highest with the handlebars turned left when parked. I really should have figured this out but I was too lazy at the time. I saw no leakage and no other mechanical issues with my front brakes. The only evidence I saw was brake fluid around the vent hole which I thought was rain water but it didn't rain that day. After I wiped it off with my finger, I thought "This is brake fluid" WTF.