@ adam86
Thanx for ur pmail n comments.
Im no expert when it comes to Daewoos tho.....with VW beetle yes I know a fair amount of stuff but Daewoos or any car with Servo assisted brakes Im not very good since I dont have first hand experience.
Neways.
Let me tell you one thing. Any mechanic who asks u to drive the car the way it is needs to get kicked HARD in his 'you know where'. The car must NOT be driven until you have identified and eliminated the problem. What you will end up would be a very overheated engine, as you say, maybe a blown head gasket, warped disk brakes and what not. DONT drive this thing. Period.
Coming to the problem. Hope I am simple and clear on matters here.
The compensating port allows excess brake fluid to flow back into the reservoir (the 'kuppi' for the brake oil). What your mechanic tested with the cylinder out of the car was simply whether the Master cyl was generating pressure or not.
It is very much possible to have the front wheels heat up WITHOUT the rear wheels doing so. This is so as Daewoo racers and most of the modern cars on the roads have a 'dual-circuit' braking system. This means that the master cyl in fact has two pistons, arranged one after the other ie in line. Each piston operates the front or rear brake fluid circuit. Thsi is a safety feature, if one circuit has a prob n fails the other is there to give u some stopping power. Both circuits will have their own compensating ports and it is possible to have one blocked and the other clear due to dirt,rust or gunk or a poor setting. This CAN lead to one circuit binding while the other behaves normally.
Ok just ignore all this......we'll make things very simple. Just do this test on your car. Start your car say in the morning and take it for a short drive around your neighbourhood. DOES it behave like this........brake pedal gets harder and harder until you actually feel that the brakes are catching up???????
If this is the case, park your car on the side and wait for a few minutes.....maybe 15-20 mins.......does the pedal get softer?????
If this test is positive then it confirmed to be a compensating port issue. Please perform this test and let us know here. Otherwise there may be few other things.....will have to read some books to find clues....let us know.
Another suggestion would be to go to another mechanic who works on Daewoos and ask him to handle the problem independently. Sometimes its a very simple thing and mechanics behave like a blind person.....not being able to see the answer right in front.
Where r u located??? If in Karachi maybe I can help.
TC and let us know of the latest.