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Brake bleeding contd


 
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Cariboo4x4
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PostPosted: Mon Feb 01, 2021 11:19 am    Post subject: Brake bleeding contd Reply to specific post Reply with quote

Ed, I havent ruled out air getting into system somewhere. Rear bleeders are rusted on ends so the brake bleeder plastic tubing could be letting air in when bleeder screw is released. I also read online air could get sucked in past threads of released bleeder screw. Wheel cylinders have been honed and rebuilt by me on drivers side yet passenger side havent been looked at yet none appear to be leaking fluid. After I rebuilt front drivers wheel cylinders the next weakest part started leaking from rear drivers wheel cylinders. Once those were all honed and rebuilt there has been no more leaking of brake fluid at any of the 4 wheels. If air was leaking in through a rubber cup or brake line fittinng I would expect to see fluid leaking out too, right?
 
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Longknife
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PostPosted: Wed Feb 03, 2021 9:18 am    Post subject: Re: Brake bleeding contd Reply to specific post Reply with quote

[quote="Cariboo4x4"](quoted from post at 20:19:21 02/01/21) Ed, I havent ruled out air getting into system somewhere. Rear bleeders are rusted on ends so the brake bleeder plastic tubing could be letting air in when bleeder screw is released. I also read online air could get sucked in past threads of released bleeder screw. Wheel cylinders have been honed and rebuilt by me on drivers side yet passenger side havent been looked at yet none appear to be leaking fluid. After I rebuilt front drivers wheel cylinders the next weakest part started leaking from rear drivers wheel cylinders. Once those were all honed and rebuilt there has been no more leaking of brake fluid at any of the 4 wheels. If air was leaking in through a rubber cup or brake line fittinng I would expect to see fluid leaking out too, right?[/quot

CB, First, If I am reading your post correctly, you have not rebuilt all the wheel cylinders. I would advise you rebuild the rest of them. If a few started leaking the rest cant be far behind! To bleed the system, bleed at the hydrovac first by putting a clear hose on the bleeder and into a jar. Have someone pump the pedal (lightly) till pressure is felt. Open the bleeder, and push pedal (lightly) to floor, while holding pedal on floor close bleeder Do this till there are no bubbles present in hose. Then go to farthest b-fitting and repeat procedure, then next bleeder and so on. After all cyls are bled let sit for 1/2 hour. Do you get a pedal now? If not, then repeat entire process and note, DO YOU GET BUBBLES? if you get bubbles on any line then that is where your air is getting in, If you dont get bubbles but cant build pressure on first push then you have a mechanical issue,,,, Ed
 
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