Will your brakes lock up your tires ?

[gator2511]

My brakes work just fine for normal or easy stops. Today I had to make a fast stop from about 55 mph for a traffic light and much to my surprise I had my foot all the way in it and it just barely stopped in time. In fact I had to back up some to let traffic pass. Any other vehicle I have owned would have locked up the tires long before this. Is this typical brake performance for these trucks? Every thing appears to be in good shape so I'm curious. Its a stock 72 4wd brake system and all the parts look correct. Tires are 32x11.5x15.