Ok any fluid marks on the rear walls of the tyres if not is your drivers side carpet under the peddle's dry or is your slave cylinder on top off the gearbox leaking another could be the fluid filling up your servo via master cylinder.
Eventually it will feel like you have no brake assistance like your brakes are made of bricks.
Not sure on prices but i would expect you could get a secound hand servo and master from someone on here (me or chris155)if it is that.
Where in the country are you?
raj get your mechanic to look on top of the gearbox under the battery tray area..
the rubber cover on the clutch slave cylinder maybe holding the fliud inside so just pull it off and see if fluid spills out.