Originally Posted By: Dakota1820
Originally Posted By: 01rangerxl
Did you lube the back of the pads with some disc brake grease?
You are actually not supposed to do that anymore.......I know it's been done forever we had a guy come in from some brake company i forget the name and tell us to no longer do that. A guy who came in a couple weeks ago from permatex told us the same thing. I'm not sure why the change though just sharing the info. Also the groan could be associated with just the kind of compound the brake friction disc is made out of?
Many of the pads I've installed recently have bonded [and sometimes nitrile coated] shims; I've read to not grease the shims of these. I've only seen to grease the backing plate of the pad [in between the pad and shims] if the shim is not of the bonded type; even in this situation, I do not grease where the shims may contact the caliper 'ears' or what you may call them. In either of these instances, I've not had noise. There is that sticky stuff [usually blue or red] that dries rubbery to suppress/absorb vibration and in turn noise on pads, however, I would not put this in any area where pad to carrier contact exists or where the back of the pad would contact the 'ears' and even with this sticky/rubbery stuff, I've found it not that great at suppressing noise, at least not as great as using pads with bonded nitrile coated shims and using new pad hardware [springs, clips, etc.].
To more directly address the OP's post, perhaps the pads you have on now are not chamfered, try taking the pads out and beveling/chamfering the leading and trailing edge of the friction material and see if that doesn't reduce the groaning noise you describe; I have had this groaning type noise on pads that were not chamfered, but then again we're talking Hawk HP+ pads and other semi-racing level or higher pads which aren't quiet to begin with. I can get my pads [Bendix CT-3] to make that same noise depending on how I brake at very low almost creeping speeds, it's the noise I describe as the noise brakes make after going through the car-wash.
