I currently own a 95 Honda Civid Dx 4-Door. It has about 103 k miles on it, and it's VERY well taken care of (timing belt changed, oil changed every 3000 miles, washed every week). I have recently, however, encountered a brake problem that I CANNOT seem to fix:

Whenever I press on my brakes, the brakes seem to travel much more than they should. Also, at stoplights, what tends to happen is the brake will go down, and then the car will start to travel forward; the brake will go down slowly, and i'll hear a "grinding" noise that i've been told is the new callipers forming a groove on the brakes.
I just paid 450 dollars for new callipers to be installed, only to find that they haven't fixed the problem. I go back to the same shop, and they tell me now that my master cylinder is going out, and they'll replace it for another 250.
Anyways, I go home and bleed the brakes for 3 days, and the brakes are working much better; however, about after 30 minutes of driving, the same problem starts popping up, ESPECIALLY when my car is on an incline. The same noise is being made, and the brake pedal travels litterally to the floor.
I am at my wit's end, and the next thing I might have to do change the master cylinder. IF ANYONE can help me figure out the hell might be causing this or where air might be leaking in (there's no fluid dripping anywhere, and air comes out everytime I bleed the brakelines), I would really, really be grateful...

 

If they've check and you don't have leaking seals on any of the cailpers then it is more likley that the seals in the master cylinder are going bad.

$450 for new calipers? I think you got taken....

If you hear grinding, most of the time it's the rotors that are being damaged not the calipers.