We have a 2010 Tahoe LTZ with 4WD. My wife recently started complaining about the brakes not stopping as they should and an occasional grind. I just inspected them, and the front brakes, inside and out on both sides of the car, are at least 50-60%. For the rear brakes, inside and out on both sides are around 30-40%. I didn't check the parking brakes, but that wouldn't be the issue here. I've heard the grumbling when she stops once, and this is generally after she exits the turnpike where there is a stop light. In town, she says the brakes don't feel like they used to. The vehicle has approximately 90,000 miles, and the brakes were replaced around 65,000 miles. The rotors have a small lip on the edge, but both sides are pretty smooth. Nothing looks odd there.

I've contemplated replacing the front brakes anyway, but I'm a bit suspicious there may be an issue with the boost. I've not checked the vacuum on that yet, but I thought I'd get a few ideas before I spend any more time on this. Thanks

 

Could be a warped brake rotor.

 

A warped rotor would cause a pulsating pedal. I suspect a stuck caliper piston causing the pad to overheat.

 

Thanks for the responses.Stuck caliper sounds likely. Take care.

 

Good piont. I believe you are correct.

 

I checked the calipers, and they seemed to be working OK. I noticed some wear on the inside tire tread, and that problem was from the left front hub. I replaced the hub about 1.5 weeks ago, and my wife has not complained about the brakes at all. She said the grinding noise and odd braking sensations are all gone. I'm not sure if this makes a lot of sense, but I'm claiming it's fixed now. Thanks for all the suggestions.