Question about long tube method of brake bleeding |
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Question about long tube method of brake bleeding |
computers4kids |
Nov 26 2011, 10:42 AM
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#1
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Love these little cars! Group: Members Posts: 2,443 Joined: 11-June 05 From: Port Townsend, WA Member No.: 4,253 Region Association: None |
I have some air trapped in my brakes and want to try the long tube method to purge. With the tubes in the resevoir and connected to each caliper nipple, I understand the idea of cracking each nippple open and pumping until the cows come come.
What puzzles me is the idea of injecting air back into the system using this method. Until the lines are full of fluid, won't you be sucking air on each pump of the brakes back throuh the nipple from the empty tubes? I have a motive bleeder but can't seem to get all the air out. It takes a couple pumps to get a hard pedal. New MC All new rebuilt calipers, etc Used the pedal pump and release method Flushed a 1/2 gallon of fluid throuh the calipers Rear vented to .004 Driven the car and repeated the bleeding with motive and two people Yes, the front caliper nipples are pointed up No speed bleeders (IMG:http://www.914world.com/bbs2/uploads/post-419-1182989448.jpg) |
computers4kids |
Nov 26 2011, 02:03 PM
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#2
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Love these little cars! Group: Members Posts: 2,443 Joined: 11-June 05 From: Port Townsend, WA Member No.: 4,253 Region Association: None |
While I'm certainly not an expert in this method, I think the idea is to keep an eye on the brake fluid level while there is air in the tubes. When you start pumping, the air will go into the brake reservoir, but the bubbles will immediately go to the top and out...as long as you don't let the reservoir run dry, you'll eventually have a solid flow of fluid. Sounds reasonable. I think.... (IMG:style_emoticons/default/confused24.gif) You put lines on each caliper's nipple and run the line(s) back to the resevoir? And open them all and pump? Is that the gist of it? I'm tired of taking the wheels off and bleeding, so quite a few people just rave about this tube method so I thought it would be worth a try. The pic below is from McMark, maybe he'll chime in or someone who has actually tried this. Brian, my thinking kind of follows yours but it sure seams you would suck an awful lot of air in before the lines finally are full...perhaps that's OK. After the amount of bleeding I've done so far, I just don't want to go backwards. Yes, I've tried the vaccum method, but have liked the motive pressure bleeder the best with a final foot from my wife to get the ultimate hard pedal. After graciously pumping her share (opening and closing the nipples at the appropriate time) I thought I had a nice hard pedal...so I bolt the wheels on and...craaapp...more air. PS I also have a T, no proportioning valve to complicate things. If I had speed bleeders then the air in the tubes wouldn't concern me. According to the threads I've read you just open the regular bleeders and pump. Maybe I'm confused. (IMG:style_emoticons/default/confused24.gif) Wouldn't be the first time. Mark |
McMark |
Nov 27 2011, 09:40 PM
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#3
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914 Freak! Group: Retired Admin Posts: 20,179 Joined: 13-March 03 From: Grand Rapids, MI Member No.: 419 Region Association: None |
The pic below is from McMark, maybe he'll chime in or someone who has actually tried this. Brian, my thinking kind of follows yours but it sure seams you would suck an awful lot of air in before the lines finally are full...perhaps that's OK. After the amount of bleeding I've done so far, I just don't want to go backwards. first time. It won't suck any air in, promise. You'll see fluid moving out from the caliper with each pump and almost no fluid going backwards. Plus the fluid will move down the line in one solid 'chunk'. Hard to explain, I guess. Just go for it. (IMG:style_emoticons/default/wink.gif) |
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