This isn't an uncommon problem after searching the net a bit. I copied and pasted another 05 owner that sounds like the same situation as yours.
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05 Silverado.. I had the same problem with the fronts locking up after driving a few miles and not even applying them on long stretches after having replaced pads,shoes, wheel cylinders, front calipers,hoses and master cylinder. Flushed lines completely twice. Checked booster by removing vacuum line and using long nylon pull tie as a dipstick to verify there was no fluid present as others have noted. After reading many blogs and the mention of possible ABS problems without the light on I removed the ABS fuse, drove about 5 miles and the brakes were locking up and cool. Replaced the fuse and drove another 5 miles, braking alot and letting the truck come to a natural stop in neutral to see if it was still partially locking up and there was no indication of it locking up. Felt the fronts and there were not hot as they were earlier in the day when I drove it just a short distance. Would let it come to a normal stop coasting in neutral with no indication of a problem. Even stopped on slight inclines and it would then roll backwards after coming to a stop. Have not had the problem since and feel more could get the same results should they try this. Wish I had of thought of it or read it somewhere long ago to save myself alot of frustration. Hopefully others will benefit.
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There was also a mention of a defective MC that leaked into the power brake booster causing the issue, but because the problem was isolated to just a small run of trucks there was no recall on it:
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I have 2006 of same truck and had same issue. If you have been adding brake fluid over the past year, pop the hose off the booster. Check in there and see if you see fluid in the bottom. I had this on mine, so replaced booster, master (leaking in booster), new pads and calipers as they roasted on mine. Flushed all the lines and been working great.
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One more that replaced the booster and solved the problem:
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SOLVED!!!!! Well it is finally fixed and I drove it to work today to make sure. I drove it Saturday and it locked up so I loosened the MC and it released immediately. So, ordered a now booster for the same truck and they gave me one that was different. UUUGGGG This one had an adjustable rod on it. So installed drove and worked after a little adjusting. Drove it all day Sunday and to work today (43 miles one way) and not hot at all! Thank you all for your help.
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Hopefully one of these things will solve your problem..........
