Hey guys i have a 1987 mustang 5.0 automatic,the problem i amhaving as of now are the rear drum cylinders they were leaking n the last few days the rear brakes wornt working i put new cylinders on today both of them but their is no brake fluid coming to the cylinders the brake pedal feels jus tlike before only the front ones are working,does anyone know what it could be??any help would be greatly apreciated thanks in advance guys.