HouseCallAuto 2/14/2013You likely have a pinhole in a steel brake line that runs down the floorpan of the car from excessive rust on these lines and now one popped a pinhole. These lines can be repaired. Are you mechanical? Do you want to DIY? First find the leak. You have to get a look under the car but if you do not have suitable jacks and / or ramps then a repair shop will get the job.