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Old 11-23-2011, 08:43 PM
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Brakes keep getting air in line

I've bled the brakes on my 93 ram d350 3 times in the last week and the pedal keeps getting soft after a few days. Anything to look for? It uas the cummind diesel if that makes a difference.

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Old 11-23-2011, 09:15 PM
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are you tightening down the bleeders? What was the original reason that you bleed the brakes?
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Old 11-23-2011, 09:47 PM
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a worn wheel cylinder can pull air back into the system
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Old 11-24-2011, 07:59 PM
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find the wheel you are getting all the air from then start looking. A brake rotor that wobbles, check broken or loose wheel bearing can do that also
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Old 11-25-2011, 12:52 AM
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2rd the wheel brake cylinders..just had that problem on my truck..turned out to be a leaking brake cylinder
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Old 11-25-2011, 06:32 PM
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Fluid leaking out can be an indication that air is getting back in. I had an old merc with a caliper that needed bleed right after I bought it. Bleed it a day later same thing, only then it was leaking.
I saw a service bulletin about chryslers ABS modulator/valve assembly allowing air into the system,might be the issue.
If the air comes out of a cylinder pretty much as soon as you open the bleeder then that cylinder/caliper would be suspect.If you have to bleed the fluid a bit before the air comes out then it is coming form somewhere upstream.
The Master cylinder primary bore seal can leak air in and not have fluid coming out, also it could leak out into the brake booster and you wouldnt see it. I had one with a booster half full of fluid as the owner was adding and it was dissapearing, until his booster quit supplying boost, then when pulling the master looking into the booster I noticed it was half full of brake fluid.
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Old 07-27-2012, 01:46 PM
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I totally forgot i made this thread thanks for the responces! Still has the problem though.... Replaced the bleeder screws since it was cheap and hoped it might help, but nothing. The booster is bad though so i have to get that replaced. Should i just get the booster and master cylinder combo? Since it all has to be apart anyway i figured ot would be good to replace it. It does always look wet though.. Weird.
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