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air in the brake system


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tes
User

Feb 24, 2013, 2:16 PM

Post #1 of 12 (2162 views)
air in the brake system Sign In

Hi there everyone, after I replace the brake lines and bleed the system, the brake pedal is fine but, after a while it becomes spongy and there is no leak around the fittings in the line I don't know where the air is being introduced into the system need your advice


Discretesignals
Ultimate Carjunky / Moderator
Discretesignals profile image

Feb 24, 2013, 5:36 PM

Post #2 of 12 (2118 views)
Re: air in the brake system Sign In

Can you give us the year, make, model, and engine size?





Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.


tes
User

Feb 24, 2013, 7:04 PM

Post #3 of 12 (2108 views)
Re: air in the brake system Sign In

Hi there thank you, yes it's a 2002 accent and the master cylinder is new actually I replaced that sucker twice, still air is being introduced.


Discretesignals
Ultimate Carjunky / Moderator
Discretesignals profile image

Feb 25, 2013, 5:55 AM

Post #4 of 12 (2077 views)
Re: air in the brake system Sign In

Is the fluid level in the master staying the same? Have you inspected the wheel cylinders?





Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.


tes
User

Feb 25, 2013, 11:08 AM

Post #5 of 12 (2055 views)
Re: air in the brake system Sign In

hello there the engine size is 1.5 and yes like you said I ve' checked the wheel cylinders and I don't see and leak, I USED the brake line Union which connects to brake lines instead of using one long line, the call it brake line union, the thing is I don't see any sort of leak in all the lines , I,am just going crazy to find out where the air is being introduced. need you help. thank you and God bless U.


Sidom
Veteran / Moderator
Sidom profile image

Feb 25, 2013, 8:22 PM

Post #6 of 12 (2041 views)
Re: air in the brake system Sign In

I ran across this a while back and am drawing a total blank on what the problem was.....

You say the pedal is good after bleeding and then later on it gets soft....How long does it take to go down? I'm guessing when you rebleed the system, you get air out of it and the pedal is good again?.....If so.....Where are you getting the air from? The frt or the rear?


tes
User

Feb 25, 2013, 10:01 PM

Post #7 of 12 (2027 views)
Re: air in the brake system Sign In

when I bleed the bakes with the engine of, the pedal feels ok but, when I start the engine the pedal goes all the way to the floor, it's very frustrating and still couldn't find out where the air is getting into the system, don't know if it's in the rear or front, like I mentioned to you there is no any kind of leak or sing of leak any where in the system. what do yo thing I should try, thank you.


Sidom
Veteran / Moderator
Sidom profile image

Feb 25, 2013, 10:19 PM

Post #8 of 12 (2026 views)
Re: air in the brake system Sign In

You may have to bleed the ABS unit.....Do you have a scan tool with bi-directional controls???

My system is down so I'll have to check tomorrow but some systems require you to bleed the ABS unit and some units you need a scan tool to do this...

Just for the heck of it, put the parking brk on and then start the car and see if that does anything for the pedal height...


tes
User

Feb 26, 2013, 10:31 AM

Post #9 of 12 (2007 views)
Re: air in the brake system Sign In

Hi there thank you, no the car has no ABS, I will try like you said but I,m on my way to give up if you have any thing to say please do.


Sidom
Veteran / Moderator
Sidom profile image

Feb 26, 2013, 7:39 PM

Post #10 of 12 (1981 views)
Re: air in the brake system Sign In

Well.....with no abs, that will make things simpler......

If the pedal is spongy and wasn't before the repair and all you did was brk lines, then either you have air trapped in the system or a bad master cyl.....since you say you've changed the master twice,,,,Then it's highly unlikely you got 2 bad master cylinders....

At this point I would pressure bleed the system......I've seen a few cars in the past, for whatever reason, bleeding it with someone pumping the pedal just didn't work... You really don't see pressure bleeders much anymore, vacuum ones are more popular.....If you have access to one, pull a rear bleeder screw, wrap teflon tape (white tape) around the threads and put it back in. Then hook up you bleeder and let it bleed for a while and hopefully it will pull the air out...

If this car has drum brks on the rear, you want make sure the shoes are adjusted correctly.....When the shoe get out of adjustment, that can make the pedal go low, also the park brk stops working.....

Good luck....sounds like you got a fun one there sitting in your bay


tes
User

Feb 27, 2013, 3:50 PM

Post #11 of 12 (1938 views)
problem solved Sign In

Hi there I really thank you for your support, the thing is there was a heat crack on the brake shoes and after I replace them and bled the brake while the engine is running it was OK, the thing I don't understand here is the difference between bleeding the system engine running and engine at rest, pleas let me know if there is.


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Feb 27, 2013, 4:20 PM

Post #12 of 12 (1934 views)
Re: problem solved Sign In

You should not bleed with the engine running. It aerates the fluid and compresses the air into tiny bubbles that you can't get out. Bleed with it off and test with it on.



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