Suspension & Brakes Theory, alignment, spring rates....

issue bleeding brakes searched

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Old Jun 4, 2009 | 03:47 PM
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Default issue bleeding brakes searched

sorry im sure this is the wrong forum for this but im looking for info from the suspension guys more then speculation in the other forums... heres the deal. 96 gsr, removed the abs system and did the rs brake conversion since i got this car while it was in pieces... everything is tite and looks to be assembled right. i go to pump fluid through the lines to the calipers and fluid is only reaching the drivers front and the passengers rear... the other two are getting no fluid or air coming through the bleeders. i understand the brake systems are designed in a 2 step incase a brake line fails so you can still drive with cross corners working, which seems to be whats going on. so i plugs the drivers front and pass rear (the two corners that are bleeding properly) and tried to pump the brake system with only the other 2 corners open, hoping the fluid or air would find its way out through those corners... fluid in the resivoir does not go down, nor does any air or fluid come from those bleeders. i have checked the lines for breaks or leaks and there are none... anyone have any clue whats going on??
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Old Jun 4, 2009 | 03:54 PM
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Default Re: issue bleeding brakes searched

from my understanding you kept 1 or 2 bleeder screws open while u pumped the brake?

what you need to do is close off all the bleeder screws, pump the brake while you refill your master cylinder (MC) and wait to build pressure in the pedal, once that's done start from (in order) RR,LF,LR,RF and bleed it until no more air bubbles seep through..

the way to bleed is pump 3 times nice and slow, on the 3rd pump hold it while someone opens the bleeder screw and your pedal sinks to the floor board. Then you close off the screw and redo the process until all the air is out of the system
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Old Jun 4, 2009 | 04:18 PM
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Default Re: issue bleeding brakes searched

what he said or what i do at times when i have no help is get a soda bottle a vacum line long enough to reach the bleeder screw. Take the bottle put one end of the vacum line in the bottle till it reaches the bottom,fill the bottle with fresh brake fluid (just enough so that the vacum line end is submerged in the fluid) put the other end to the bleeder screw. Open the screw and pump the brake pedal till no air comes ouy (Make sure the line is still submerged in the brake fluid so it wont pick up air) eventually the bottle will fill up with brake fluid. Just do the same at each caliper empty the bottle when it gets full and make sure the master doesent go dry. Also try not to push the pedal to the floor with to much pressure as that can damage the seal and that at times will not let the system build pressure. That is a home made 1 man brake bleeder.
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Old Jun 4, 2009 | 04:19 PM
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Default Re: issue bleeding brakes searched

prop valve took a ****, remove lines from prop valve and see if fluid is even coming out
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Old Jun 4, 2009 | 08:52 PM
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Default Re: issue bleeding brakes searched

Originally Posted by topdog
what he said or what i do at times when i have no help is get a soda bottle a vacum line long enough to reach the bleeder screw. Take the bottle put one end of the vacum line in the bottle till it reaches the bottom,fill the bottle with fresh brake fluid (just enough so that the vacum line end is submerged in the fluid) put the other end to the bleeder screw. Open the screw and pump the brake pedal till no air comes ouy (Make sure the line is still submerged in the brake fluid so it wont pick up air) eventually the bottle will fill up with brake fluid. Just do the same at each caliper empty the bottle when it gets full and make sure the master doesent go dry. Also try not to push the pedal to the floor with to much pressure as that can damage the seal and that at times will not let the system build pressure. That is a home made 1 man brake bleeder.
thats exactly what i was doing... i was doing a gravity bleed to start then i was going to move on to actual bleeding of the system, but when the gravity bleed wasnt getting anywhere i knew i had an issue... i ended up removing the line from the MC to the prop that fed the two corners i was having an issue with. the line was bone dry. i had someone pump the pedal to see if it spray fluid and it did not, but i heard air blowing out somewhere from the boaster... i was worried the boaster had gone bad somehow and when i removed the MC from the booster i found there were two seal inside between the bb and the mc... when i bolted the rss mc on it had a seal on it and apparently i rushed and when i removed the gsr mc the seal stayed in the boaster... so the two of them in there caused an air leak somehow or the extra space was not allowing the plunger to hit the mc all the way bc the mc wasnt able to seat in there properly... anyways once i replaced the seal properly and bolted it up everything went to working properly... im an idiot for rushing sometimes

thanks guys
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Old Jun 4, 2009 | 08:53 PM
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Default Re: issue bleeding brakes searched

Originally Posted by postman
prop valve took a ****, remove lines from prop valve and see if fluid is even coming out
thats what i originally thought... thankfully it was just a fluke issue
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