View Full Version : Wheel cylinder bleeder screws cracked open.....How long to wait?
Badbird Sep 22nd, 07, 06:56 PM I would like to get the bubbles out of these 2 front wheel cylinders before the snow flies!!:mad:......I purchased one of those hand pumps and found it no better than gravity bleeding!!.....It didn't appear to have enough suction power!:mad:.....As a last resort, I cracked open the bleeder screws to the point where brake fluid is not leaking out of them.....My question is approx. how long would it take for the wheel cylinders to relieve themselves from all the air bubbles?
Corvettemaster Sep 22nd, 07, 07:24 PM Well that depends, there can be serveral things to factor and the fluild may not gravity bleed on its own.
What I do is make a simple one man bleeder out of a gatoraide plasitc bottle and a piece pf 3/16 vacuum line pushed through a drilled hole in the cover. THe fluid will not eat through the plastic, I have some that have had breakfliud in it for more than five years.
Start with the bleeder farthest from the the mastercylinder and put your wrench on the bleeder and then push the hose over the bleeder. be sure you have a few inches of break fluid in the gatoraide bottle and its covering the hose you put in there through the hole drilled in the cap.
Now with the MC full and the cover at least laying on the MC so you don't make a mess, pump the brake pedal several times. you should feel it go to the floor. Do this on each whell working farthers i.e right rear to the left front be sure not to let the MC run dry.
You should have a well bled system unless you have something else going on thats keeping the flow of BF. Like a bad proportioning valve or a bad MC etc...
Let me know how you make out.
RamAirDave Sep 22nd, 07, 07:44 PM Using a hand vacuum pump, it is normal to see air bubbles in the hose even once they are bled. It mentions in the instructions that it is the air coming through the threads in the bleeder screws. I wouldnt worry about the air bubbles you see on a suction process rather than a pressure one.
Ive used that tool on many cars. Its tedious, but not all that difficult. Usually a half dozen or so reservoirs worth of fluid (with no new air entering the system) will have the system bled well.
Badbird Sep 22nd, 07, 08:05 PM Everything is new in the complete braking system.....It's a simple manual drum brake car and the rears are done and bled already.....It's just that I'm loosing patience with the fronts and have the bleeder screws cracked open and would like to know how long it should take to bleed themselves?.....Like, should it take a couple days or a week or longer?
Badbird Sep 22nd, 07, 08:19 PM Using a hand vacuum pump, it is normal to see air bubbles in the hose even once they are bled. It mentions in the instructions that it is the air coming through the threads in the bleeder screws. I wouldnt worry about the air bubbles you see on a suction process rather than a pressure one.
Ive used that tool on many cars. Its tedious, but not all that difficult. Usually a half dozen or so reservoirs worth of fluid (with no new air entering the system) will have the system bled well.
Yes, that pump is very confusing to me because the brake pedal feels firm yet those bubbles are never ending in the clear tubing!.....I noticed that on the instructions, it is optional to wrap teflon tape around the threads on the bleeder screws, I didn't!
RamAirDave Sep 22nd, 07, 08:22 PM Yes, that pump is very confusing to me because the brake pedal feels firm yet those bubbles are never ending in the clear tubing!.....I noticed that on the instructions, it is optional to wrap teflon tape around the threads on the bleeder screws, I didn't!
They mention teflon tape so the air doesnt get through the threads, leaving you thinking that there is still air in the system. You will never get rid of the bubbles in the clear tube with that pump. But if the pedal is firm, and the car brakes well, you're fine. :thumbsup:
Badbird Sep 22nd, 07, 08:47 PM They mention teflon tape so the air doesnt get through the threads, leaving you thinking that there is still air in the system. You will never get rid of the bubbles in the clear tube with that pump. But if the pedal is firm, and the car brakes well, you're fine. :thumbsup:
Thank you!.....I feel much better now!.....I'm probably done and don't even know it!.....This was my first experience with the pump and it's nice to hear from someone who's been using it on many cars in the past!.....Thanks again man!:thumbsup::beers:
RamAirDave Sep 22nd, 07, 09:08 PM It probably isnt the best/easiest method. Ive heard good things from those that use a pressure bleeding system. But it does work.
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