Cant bleed air out of the brake lines! - JeepForum.com

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post #1 of 16 Old 05-05-2011, 11:02 AM Thread Starter
1998redTJ
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Cant bleed air out of the brake lines!

I changed my front calipers yesterday and now I cant get all the air out the front bake lines. Ive followed 2 person bleeding procedure (car off...helper pumps the pedals then firmly depresses as I open the bleeder valve to draining into a container. I start at the rear right, rear left, front right and finish at front left. So far Ive been through 4 32oz cans of brake fluid and I'm still getting air bubbles out of the front brakes. The rear brakes are fine with no bubbles and clean fluid running out. The calipers are installed properly. No leaks in the lines anywhere and the bajo bolts on the calipers are snug with washers installed correctly. At times i can get some pressure built in the lines but as soon as i start the Jeep the pedal gets soft and is easily pushed to the floor (it does rise back up when my foot is removed.) Please...any takers!?!

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post #2 of 16 Old 05-05-2011, 11:15 AM
03rubiconMG
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i always have bled my lines with the jeep on and its always been very easy.

I have also changed the front brake lines on two different jeeps and never bled the rear brake lines at all because they were not bothered.

the following is how i bleed lines and it works every time with 2 people

-fill reservoir with fluid (overfill because you will use it)
-turn on jeep
-crack bleeder screw
-depress brake pedal all the way slowly and leave depressed
-close bleeder screw
-release brake pedal
-crack bleeder screw
-depress brake pedal all the way slowly and leave depressed
-close bleeder screw
-release brake pedal
-repeat untill no more air bubbles.
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post #3 of 16 Old 05-05-2011, 11:19 AM
MONSooNmonkey
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You have to bleed the calipers....

Sadface :(
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post #4 of 16 Old 05-05-2011, 11:21 AM
RockMonster
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^ standard procedure has never failed for me. Id say if your doing this correctly than there is somewhere below the MC that is ingesting air into the system.

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post #5 of 16 Old 05-05-2011, 11:30 AM
dcope17
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Make sure you have the calipers on the correct side... if they're right... the bleeder valves will be above the brake line.

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post #6 of 16 Old 05-05-2011, 11:34 AM
Jerry Bransford
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Yep, you have the calipers reversed left-for-right. Doing that flips them upside-down which lowers the bleed point below the point at which trapped air remains which means you can't get all the air out.

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post #7 of 16 Old 05-05-2011, 11:40 AM
Penatzer93
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i have this same problem with my yj. my calipers seized up and now i have slam on my brakes to even start. im at 6 32oz bottles and have no idea why this is happening.

ps. this is mainly a way for my to subscribe for further information, but what i found was that i had to bleed the MC as well, to get any change at all.
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post #8 of 16 Old 05-05-2011, 12:06 PM Thread Starter
1998redTJ
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Bleeder vales are positioned below the brake line. I had the parts store clerk label the calipers with sharpie so i wouldn't have this happen. I know I have them installed per his designation (left on the left side) but ill try reversing them and report back.
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post #9 of 16 Old 05-05-2011, 12:07 PM
MONSooNmonkey
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Your MC will get air from the lines running dry, easy way to change callipers is to pull the old one off and stick a finger over the line while someone else puts the new one in place and you fill the caliper with as much fluid as possible, replace line and begin bleeding it at the wheel, then move to the MC and finish it off.

Most left over air will bleed itself out over about a weeks time. (in my experience that's how its happened anyway.

Sadface :(
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post #10 of 16 Old 05-05-2011, 12:15 PM
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Quote:
Originally Posted by 1998redTJ View Post
Bleeder valves are positioned below the brake line.
Bubbles rise up not down. The bleeder valve has to be higher than the point at which bubbles can collect.

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post #11 of 16 Old 05-05-2011, 01:50 PM
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Yep, bleeders have to be on top, swap the calipers and you'll be much better off.

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post #12 of 16 Old 05-05-2011, 01:55 PM
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Quote:
Originally Posted by 1998redTJ View Post
I had the parts store clerk label the calipers with sharpie so i wouldn't have this happen.
The problem has been identified.

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post #13 of 16 Old 05-05-2011, 01:56 PM
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Quote:
Originally Posted by 1998redTJ View Post
Bleeder vales are positioned below the brake line. I had the parts store clerk label the calipers with sharpie so i wouldn't have this happen. I know I have them installed per his designation (left on the left side) but ill try reversing them and report back.

Part store guy are not always right.

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post #14 of 16 Old 05-05-2011, 03:23 PM
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Quote:
Originally Posted by 1998redTJ View Post
Bleeder vales are positioned below the brake line. I had the parts store clerk label the calipers with sharpie so i wouldn't have this happen. I know I have them installed per his designation (left on the left side) but ill try reversing them and report back.
Why did you have him do that, is he the one doing the install? If not, then you need to know how to tell the difference without the graffiti all over your calipers, besides which, how does he know? Part number on the boxes that the last guy laid on the counter and put back in the wrong boxes?

Bleed screw above flex line. No exceptions.

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post #15 of 16 Old 05-05-2011, 03:39 PM Thread Starter
1998redTJ
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Yeah lesson learned. I brought my old calipers to the store so I they would not charge me for the the core. The cashier told me I couldn't take home the boxes from the reman calipers. So out of the box came the new and in went the old. I carried the new calipers home with me. I specifically told him to label the units so this wouldn't happen. I went back today and they threw me a complimentary bottle of brake fluid so I could get everything in order.

The brakes work great now! At least my brake system is completely flushed and, after all that brake pumping, I can rest assured there are no weak points in the system
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