Q: Q: brakes

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When I press on my brakes it sounds like air and it goes to the bottom easy. I replace master cylinder, brake lines, wheel cylinder, caliper. It is was bleed and still doesn't stop correctly that is when i heard the air noise when pressing down the brake pedal. I not sure if my brake booster has a leak or if my vacuum line is messed up. my truck is a 1997 Dodge ram 1500 5.9L and it has 4x4 I put way to much money into the brakes to make it not work . Not even sure if it is all 4 abs or rear abs. How can I test to see if my brake booster work also? But what do you pros think is wrong with it?
My car has an automatic transmission.

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