Brake sounds and noises?

The problem I am having starts as I am slowing down to a stop. Usually below 10 mph. The brakes start to make a grrrring sound that sounds like it is coming from the power boost unit. The truck stops eventually but acts like it is not getting full pressure to the brakes. Letting off the pedal and reapplying usually stops the truck. The pedal never goes to the floor during this time. Brake fluid level is up to the correct level. Reapplying the brakes has worked untill this morning on the way to work when I was stopping for a traffic light and almost didn, t stop in time before coming too close to the vechicle in front of me. Reapplying the brakes actually made it worse and the noise got louder. Any ideas would be helpful. Is there a way to check the booster unit? Thanks Gary

Ok, I'm a regular driver. I deliver papers for the local newspaper in my area. I'm constantly running hard and sometimes have to hit the breaks for the occasional herd of Elk. But this is typically usual for stopping at, relatively high speeds for a truck. My truck does have ABS so I have been told this "clicking" sound is coming from the abs because this issue only occurs when the breaks are locked up. (So realistically this happens at lows speeds on ice also) The sound is similar to a wind-up-toy that has been wound too far and there is some vibration in the pedal.

I'm asking because I'm getting ready to change my breaks next month and want to make sure there might not be a caliper issue also. Because occasionally I do get a pull to one side. I just ask this cause ive had many vehicals with ABS over the years as it kinda comes standard these days and have never heard breaks click like crazy like this. Kinda bothers me considering I just had a New born last week

Any ideas?

I have a 2000 Chevy Silverado, automatic transmission, 4-wheel drive, 178000 miles. I had a shake when braking so I replaced the front rotors and pads, and still have this vibration problem, but not with every stop. Speed has no effect as sometimes it vibrates at a low speed stop and other times at high speed. Some stops have NO vibration at all. It appears to be coming from the right front. I had the ball joints checked and was told they were still okay, with normal wear. The truck also does not seem as tight or as stable as before. It also has new tires all the way around. Where do I look next? The control arm bushings? The idler arm? Something is causing this intermittent vibration when stopping. I am perplexed to say the least.

This is more of an add-on to the original question, rather than an answer. I have an '03 Silverado 1500-HD 4WD auto with 51k miles, and I'm having the same issues. The brake vibration isn't severe, but certainly noticeable. Could the ABS sensor still be the source with only 51k miles? Looks like the pads still have plenty of life, and the rotors don't show any obvious signs of damage.

Tires are stock. I'll look things over - once I can get the darn wheel off! Lug nuts are off and the wheel still won't budge! ?