| Gravity bleeding...explain like I am five why it works.... [message #258834] |
Thu, 14 August 2014 19:44  |
thorndike
Messages: 406
Registered: January 2011
Location: Conifer, Colorado
Karma: 0
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Senior Member |
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Ok,
I put my new caliper on this morning and as I was working alone I decided to open the bleeder valve and let gravity do the work as suggested by others. Worked great, soon I had bubble free brake fluid coming out of the caliper. I closed it up and tested it. While it wasn't perfect (mine have never been perfect) it seemed to be better than before. Great. What I can't figure out is how/why the flow of brake fluid moves any air bubbles located in the high points of the brake line down the line and then out. Brake fluid doesn't seem dense enough to 'push' the air bubbles down the line.
Explain it like I am five....
Bob
Robert Peesel
1976 Royale 26'
Side Dry Bath
Conifer, Colorado
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| Re: Gravity bleeding...explain like I am five why it works.... [message #258861 is a reply to message #258834] |
Thu, 14 August 2014 23:51  |
George Beckman
Messages: 1085
Registered: October 2008
Location: Colfax, CA
Karma: 11
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Senior Member |
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thorndike wrote on Thu, 14 August 2014 17:44Ok,
I put my new caliper on this morning and as I was working alone I decided to open the bleeder valve and let gravity do the work as suggested by others. Worked great, soon I had bubble free brake fluid coming out of the caliper. I closed it up and tested it. While it wasn't perfect (mine have never been perfect) it seemed to be better than before. Great. What I can't figure out is how/why the flow of brake fluid moves any air bubbles located in the high points of the brake line down the line and then out. Brake fluid doesn't seem dense enough to 'push' the air bubbles down the line.
Explain it like I am five....
Bob
Miguel is right. I love it.
I think the theory is that the viscosity (thickness of the fluid) and the small size of the tubes makes it difficult for a bubble to let fluid pass it by (bubble float up) and the bubble is carried down "against gravity".
'74 Eleganza, SE, Howell + EBL
Best Wishes,
George
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| Re: Gravity bleeding...explain like I am five why it works.... [message #258862 is a reply to message #258834] |
Thu, 14 August 2014 23:52 |
George Beckman
Messages: 1085
Registered: October 2008
Location: Colfax, CA
Karma: 11
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Senior Member |
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thorndike wrote on Thu, 14 August 2014 17:44Ok,
I put my new caliper on this morning and as I was working alone I decided to open the bleeder valve and let gravity do the work as suggested by others. Worked great, soon I had bubble free brake fluid coming out of the caliper. I closed it up and tested it. While it wasn't perfect (mine have never been perfect) it seemed to be better than before. Great. What I can't figure out is how/why the flow of brake fluid moves any air bubbles located in the high points of the brake line down the line and then out. Brake fluid doesn't seem dense enough to 'push' the air bubbles down the line.
Explain it like I am five....
Bob
Miguel is right. I love it.
I think the theory is that the viscosity (thickness of the fluid) and the small size of the tubes makes it difficult for a bubble to let fluid pass it by (bubble float up) and the bubble is carried down "against gravity".
'74 Eleganza, SE, Howell + EBL
Best Wishes,
George
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| Re: Gravity bleeding...explain like I am five why it works.... [message #258863 is a reply to message #258834] |
Thu, 14 August 2014 23:52 |
George Beckman
Messages: 1085
Registered: October 2008
Location: Colfax, CA
Karma: 11
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Senior Member |
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thorndike wrote on Thu, 14 August 2014 17:44Ok,
I put my new caliper on this morning and as I was working alone I decided to open the bleeder valve and let gravity do the work as suggested by others. Worked great, soon I had bubble free brake fluid coming out of the caliper. I closed it up and tested it. While it wasn't perfect (mine have never been perfect) it seemed to be better than before. Great. What I can't figure out is how/why the flow of brake fluid moves any air bubbles located in the high points of the brake line down the line and then out. Brake fluid doesn't seem dense enough to 'push' the air bubbles down the line.
Explain it like I am five....
Bob
Miguel is right. I love it.
I think the theory is that the viscosity (thickness of the fluid) and the small size of the tubes makes it difficult for a bubble to let fluid pass it by (bubble float up) and the bubble is carried down "against gravity".
'74 Eleganza, SE, Howell + EBL
Best Wishes,
George
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| Re: Gravity bleeding...explain like I am five why it works.... [message #258864 is a reply to message #258834] |
Thu, 14 August 2014 23:53 |
George Beckman
Messages: 1085
Registered: October 2008
Location: Colfax, CA
Karma: 11
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Senior Member |
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thorndike wrote on Thu, 14 August 2014 17:44Ok,
I put my new caliper on this morning and as I was working alone I decided to open the bleeder valve and let gravity do the work as suggested by others. Worked great, soon I had bubble free brake fluid coming out of the caliper. I closed it up and tested it. While it wasn't perfect (mine have never been perfect) it seemed to be better than before. Great. What I can't figure out is how/why the flow of brake fluid moves any air bubbles located in the high points of the brake line down the line and then out. Brake fluid doesn't seem dense enough to 'push' the air bubbles down the line.
Explain it like I am five....
Bob
Miguel is right. I love it.
I think the theory is that the viscosity (thickness of the fluid) and the small size of the tubes makes it difficult for a bubble to let fluid pass it by (bubble float up) and the bubble is carried down "against gravity".
'74 Eleganza, SE, Howell + EBL
Best Wishes,
George
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