Hi, my 94 Clio 1.9D has drum brakes, which have been making a slight grinding noise. Today I pressed the brake pedal and a crashing noise happened. I pressed it again, and another crashing noise followed. After this, there was no pressure going to the pedal. Fluid leaks when I press the pedal now, and I don't know how to check what is wrong. Will I need to replace shoes, cylinder, drums, or what? I need to price this up ASAP. Thanks.