Spongy Brakes

I have had somewhat spongy brakes since I bought the car. Since I have bought the car, I have had the front rotors replaced, the rear drums grinded, and the rear brake lines replaced (The first two needed to be done, and the 3rd: they rotted: I lost my brakes slowing down for a light, not fun). I was wondering how I can get the pressure back up because It would be nice to have a very sensitive set of brakes.

Thank you ahead of time.

-Brian

I have had somewhat spongy brakes since I bought the car. Since I have bought the car, I have had the front rotors replaced, the rear drums grinded, and the rear brake lines replaced (The first two needed to be done, and the 3rd: they rotted: I lost my brakes slowing down for a light, not fun). I was wondering how I can get the pressure back up because It would be nice to have a very sensitive set of brakes.

The first thing that comes to mind is the usual culprit, air trapped in the brake system. Bleeding all four brakes should get rid of the air, if that's the problem.

If you still have a very wimpy pedal, does it start out resisting a push at first and then the pedal keeps going further in slowly? That could be the master cylinder bypassing, where a valve in the master cylinder is allowing fluid by it, making the pedal keep moving towards the floor after it initially resists. That requires a replacement master cylinder or a kit to rebuild it.

Good luck.