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Old 03-02-2012, 10:37 AM
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Disk brake calpers drawing in air?

This is on my wife's daily but it's beating the daylights out of me.

91 Dodge Grand Caravan with regular power brakes. I've bled the brakes several times and she can drive about a day and it gets air in the front brake line. I bleed it again and it's good for a couple of more days before it draws air in again.

Anyone with any ideas? I'm either thinking that it's allowing air to be drawn in past the seal in the caliper but the seal isn't leaking or possibly the residual valve isn't working right and not keeping the slight pressure on the calipers allowing air to get in.

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Old 03-02-2012, 05:33 PM
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Might be time for a new master cylinder.
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Old 03-02-2012, 06:14 PM
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Yes they can suck in air and not leak. Have had that problem before on Corvettes .It might be a loose [wobbling] rotor also. When you bleed brakes air comes from one caliper not other suspect that one
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Old 03-02-2012, 08:27 PM
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Thanks Henry the 32nd, that is what I was thinking.

The mastercylinder had been replaced previously.

It looks like it's time to replace the calipers.
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Old 03-03-2012, 07:19 PM
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I had an old mercury that would do the same thing. It was the caliper, it did eventually start leaking fluid out, but let air in a couple of times first to help confuse me.
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