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It's very hard to diagnose problems like this at a distance, I'm sure it would be easy back here in the U.K in any good workshop to pin point the cause very quickly. The first thing to do with any brake fault is to put the vehicle onto a brake tester to see how good the brakes are on each wheel. It might be that they are only working on one axle, or that they are all working but with very poor efficiency. Do you know if the garage you have been taking to have any way of testing the brakes on rollers and if they have did they ever give you any readings ? I think without knowing this it's all a bit working in the dark, just to change parts in the hope that it will cure the problem is very hit and miss as well as being expensive.
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