Where is the leak from? Is it from the cylinder? Is it from the Brake Oil tank? Open the hood and have a look and very likely you will discover the source of leakage. Most likely is the seal giving away.
Pl. watch whether the wheels are wet (one side near the shoe) with brake oil. if it is so then leaking from the shoe. If it is dropping in the sides of the wheels then pipe line may be leaked. Another possibility is leaking in the oil tank. Also watch whether the dropping is increasing when you are pressing the brakes. If the brake oil reduces even in the standing condition then possibility of leakage in the pipeline or the tank. Take the cat to the MASS.
I’m experiencing a similar issue in Maruti 800. My car’s faulty rear brake cylinder was replaced last weekend during the servicing at T.R Sawhney in Okhla. Some time back I found that it is leaking again, thanks to their incompetent workmanship, Infact, for some reason the brake pedal has also become loose resulting in inefficient braking. This is a serious issue. I have complained to the concerned authorities. Now they have assured to look into it. I will update with more information this weekend.