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you have to pressure bleed the air out
you do that by getting a friend to pump then hold down the pedal while you open the bleed screw
close of the screw and re-pump and hold down again repeat the operation until there are no bubbles
The master cylinder supplies the pressure to the brake fluid that travels between the maste brake cylinder resevoir and the brake caliper pistons (through the brake lines. If the master cylinder fails there will be insufficient compression of the brake fluid to make the calipers operate as designed. Leaks in the brake lines and/or cylinders is a possibility, and unrelated to functionality of the master cylinder. Also, pistons located in the brake calipers can form a corrosion ring on their inside walls if there is breakdown in the brake fluid or moisture that gets into the lines. Operating the vehicle when there is insufficient brake fluid in the master cylinder resevoir can also lead to air getting into the brake lines, causing bad working brakes. Air compresses more than brake fluid, and the master cylinder isn't designed to compress air in the brake lines. Sounds like a bad case of "lack of maintenance", as opposed to bad advice from the mechanics. That said, there's no excuse for bad installation. But, it's tough to improperly install a brake line since they are nothing more than hollow metal tubes. There should be no rubber connectors installed in the brake lines. When bleeding the brake lines one must remove all of the trapped air before you will see any fluid appear. If the valves in the master cylinder are not properly operating the master cylinder will not allow the brake fluid to get into the brake lines.
Sounds like you are not getting power to your fuel pump, test both ends of the supply line with a meter, andhave someone else to help you by operating the key, because the system will cycle on for a few seconds and then turn off,,,then you need to turn the key off and back on to get it to operate again.
There are two A/C service ports located somewhere in the system, one on the high side (larger port) and one on the low side (smaller port)
They are located in different areas depending on the vehicle, and there is no general location I can give you.
Start from the compressor (belt driven on the engine) and follow your lines, they should be somewhere on the A/C lines or accumulator/dryer (big aluminum canister near the firewall) and are (usually, if they were not left off) capped. Twist the caps off and inside is a "Schrader-type" valve (like the valves on tires). These are the service ports.
Just for reference, there are 2 different sizes of A/C lines on any vehicle, the small ones are the high pressure side (liquid side)(lines which get hot during operation) and the larger ones are low pressure side (vapor side) (lines which get cold during operation).
The system runs a small line from the compressor (on the engine) to the condensor (in front of the radiator), a small line from the condensor, through the orifice tube to the evaporator (inside the cab heater box) then a larger line out of the evaporator, through the accumulator/dryer, back to the compressor.