Terrible Problem on my car brake system. Wish your advice

what make and model of car.
1. when you pressed brake pedal, if you felt the foot pedal hard to press down, it meant the engine already stalled.you can not stop the car, until you restart the engine, vacuum hydraulic brake system. No engine vacuum.That is engine oil , charge lamp on dash panel lighted and you don't see.
2. if you sure the engine still running, but the foot brake felt soft and spongy when pressed, that meant your brake master cylinder interial leak lost pressure. change it.
3. if you sure the engine still running, but the foot brake felt hard to press down, that meant the brake booster fail to hold the vacuum inside, so minor leak on it connecting hose -one way valve, valve seized bu carbon deposit, changed the vacuum hose with the non return valve. which coonect from brake booster to intake manifold.
If the vacuum booster and master cylinder in good condition, even one wheel brake leaking, you car also stop because you car must have split system.Secondary brake still working.

2006-12-16 20:41:11 補充：
4. brake pedal pin is loose sometime, near the pedal brake light switch.

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