I replaced my rear rotors and pads on my 2016 Silverado. These were ACDelco parts off Amazon (beginning to wonder about the quality). They squealed in reverse since the start. Pulled the pads back off and put brake grease against caliper and piston surfaces that contact the pads. No change. Never had this happen in 30 years of doing brake jobs when using all new parts. Any suggestions would be greatly appreciated.

I don't have anything proven to work to report. I have done hundreds of brake jobs on GM trucks and other GM products and plenty on my EVO but I have never encountered a directional noise?

Is it just a nuisance squeal that you can live with, or does it sound like something is in contact?

I use grease or the sticky anti-squeal compounds too, but I have never had 100% satisfaction from them.

You may try putting small dabs of grease between the caliper clips and the caliper mount, and then another between the tab on the pads and the clips. The noise can be coming from any of those spots, but they are hard to grease being so close to the rotor, so I usually use a q-tip or toothpick to apply grease there.

The one thing I will pass on that sounds weird but 100% removes pulsing from GM disc brakes was a tip I read in the GM service manual on my Tahoe. When tightening the caliper bolts, do not allow either wrench to make contact with the caliper or caliper mount. Sounds weird I know, but I can say with certainty that if your wrenches make contact you will feel a faint pulsing in the pedal especially under normal residential neighborhood type braking situations, and if you are careful not to allow your wrenches to make contact you will not have the pulsing. I'm sure this has nothing to do with your squeal in reverse, but since vibrations create noise, you never know...

Bonfire97 said:

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I replaced my rear rotors and pads on my 2016 Silverado. These were ACDelco parts off Amazon (beginning to wonder about the quality). They squealed in reverse since the start. Pulled the pads back off and put brake grease against caliper and piston surfaces that contact the pads. No change. Never had this happen in 30 years of doing brake jobs when using all new parts. Any suggestions would be greatly appreciated.

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Possible the parking brake drums are rubbing? Maybe try backing the adjusters off a little?

Did you clean and lubricate the caliper pins?

I actually did not do this. Is there a chance those could be causing a this? The bad thing is that this is actually my 20yr old son's truck and and I am trying to show him how to work on things. I am starting to feel like I failing on this….

I have been cleaning and lubricating caliper pins ( every other year) as maintenance since I had one seize up… from lack of maintenance.

You may have a siezed pin