[71chevy72]

So I am having issues with mu brakes. I was having trouble stopping. The booster was working but I had a lot of air in the brake lines after bleeding them several times over the last few weeks I still would have to pump them quite a few times to stop. The lines were all good the booster passed the tests so we replaced the master cylinder. Now the booster seems like it is not engaging. And the brake pedal os very hard.
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