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Q: frt rotors wearing and noise in rt frt on 2007 Chevrolet Silverado 1500

I have a 2007 1500 Classic 4WD with 82,000 miles. I have noticed a noise that seems to be coming from the rt frt. It originally sounded like the squealer tabs when the brakes start to get worn. The noise then sounded more like a bearing or possibly the frt axle. I took the frt wheels off, the brake pads are approx 60% worn with the inner pad more worn, however not worn out. The frt rotors have grooves in them like when pads are worn to thin, however this is not the case. It appears the pads are wearing the rotors. With the brake pads off the rt frt hub spins freely, however there is a grinding type noise. The left frt will spin, but not as freely as the rt frt with no noise in the lt frt. I have twisted and pulled on both axles and there does not appear to be any play. Is the wear to the rotors normal and would this be causing the noise in the frt end and how can I check the bearing to see if it is making the noise?
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Noise in right front is likely the wheel bearing and the harder to spin left front could be same minus the noise. It is not uncommon to have some groove typw wear in the rotors from the pads. The uneven wear can be caused by binding caliper pistons, may have gunk build up from not flushing brake fluid. Could also be wearing uneven from the caliper guides being dirty and rusted and loss of high temp lube causing the caliper to bind and not relax back after unapply the brakes. This can cause the brake squeal noise even though the pads are not worn out. If in fact there is a problem inside the calipers then they should be replaced and replace rotors and pads, do a complete clean up of caliper mount and glide areas. Flush brake fluid and roadtest. If right noise goes away so be it but may still have to replace bearing(s). To check the bearings you can drive straight and while moving turn the wheel slightly to the left and right. When turn to right the left front bearing will load and if has noise it should get louder, same goes for the other bearing when turn slightly left. Good luck.
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