AIR STILL IN BRAKE LINES!!!!

Umm why did they replace the calipers? And there isn't a "slave cylinder" in the brake system, as technically the calipers themselves are what would be considered a kind of slave cylinder... sorta. Your shop sounds sketchy if that is what they told you they replaced. Bleeding brakes is a simple procedure, you can do it with one or two people, but I prefer two. If you have a MityVac, just follow the instructions to bleed the brakes, its pretty straight forward. Often overlooked procedure though is bleeding the brakes in order. Can't recall what that is for the Avy, but typically it's pass-rear, driver-rear, pass-front, driver-front. Just make sure you crack the master-cylinders cap, and don't forget to add more fluid to it as you are bleeding, or you'll just add more air to the system.

You may want to also check the vacuum lines leading to the brake booster. It's the big black round guy that the master cylinder is attached to. It will have a couple vacuum lines coming from it, just follow those lines and check for tears and damage.

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I had a certified mechanic ive know and trusted for 10 years bleed the brakes. He sed the abs sensor is in the back on my car so he just bled the front. But i did open the back lines the day before and fluid was coming out in a pretty good stream. He then told me i shouldnt have anymore air in the lines. I then drove it around and i still get the sputerring brake pedal sometime when i stop. The abs light is going on and off. I have different sized tires on my car. They take 205 65 94h. But the only that is a 205 65 is the left rear and its 92h. The driver rear tire is 195/60 i believe but definitely not the right size. He said once i get the correct size on both rear tires i should stop having the issue which isnt air in the lines but the abs kicking in and the tires stopping at different speeds because they are different sizes. Ive been driving this car for 13 years and never had this issue and i know for sur ive had different size tires back there. He also said the abs sensor could be dirty which is giving a false reading. I thought the abs feature felt more herky jerky like u can actually feel the calipers quickly grabbing the rotor. This doesnt feel that way. Its a soft sputter. Definitely doesnt feel like the calipers are engaging rapidly. I still have to check the vacuum line to the brake booster which i believe is the original. Im not sure what to believe now. Thx in advance again guys. I really love this car. It was my grand dads and the engine and transmission is strong. I wanna keep it going