Ford Ranger Brake Pedal Spongy

What Would Cause The Pedal To Slowly Go Down To The Floor When A Constant Hard Pressure Is Applied To The Pedal ? Also Note That The Pedal...

I Can't Get A Good Hard Pedal On My Brakes. The Pedal Was A Little Soft Before I Changed The Rear Break Lines (including The Center Hose)....

This Problem Has Been Slowly Developing Over Months. Crept Right Up On Me. Tried To Stop In A Little More Of A Hurry Than Usual, And Was...

My Brakes (when Stepped On) They Feel Spongy And Dont Work Until Pressed Down All The Way. Plus The Abs Lights And Brake Warning Lights Are...