CHEVROLET BRAKE PEDAL HARD

When I Step On The Brakes The Pedal Is Real Hard. I Try Pumping Them But There Is Not Much Change. At Times I Have To Push Real Hard To Stop...

I Have A 97 Blazer W/abs And The Brake Pedal Is Extremly Hard And Not Stopping Very Well Just Wondering If It Is A Problem W/abs System...

My Truck Has A Hard Brake Pedal But Will Not Hardley Stop The Truck.I Have Pushed On The Pedal Pretty Hard Will Stop Slowly.