I just installed new brakes on my silverado (Duralast MKD369) I have about 35 miles on them and I have noticed a kind of a grinding sound when applying the brake softly and less when I press hard on the pedal. The sound only occurs once a rotation so it is not a constant noise. I don't know if they just need broken in, they need adjusted, or my rotors are warped? Before I changed the pads the whole truck would shake slowing down from about 65mph and then stop and it seems to still do it now but not as bad. What are some tests I can do? Any help would be appreciated.

 

Sounds like possible rotors.
Does it kinda surge when you are slowing to a stop?
If so, you need rotors.

 

Before I changed the pads when I would slow to a stop you could feel the brakes get tight then kind of loose again as if the rotor was bent in one spot so I'm guessing it's the rotors just need replaced

 

Ya.
That is the pulsing/surging I was talking about.
Time for new rotors