Moaning + pedal pulsating while turning

can’t return the crap rotors I bought but they’ll exchange them so I’ll give that a try. Thank you

 

The MC looks like the unicorn that is hated.

 

Here's what the mutant ones look like

 

Could it be a wheel speed sensor?

To me that video really sounds like ABS kicking in but at that slow speed there is no reason it should be. My 4Runner brakes sometimes do a groaning pulsing on wide turns at speed like an exit ramp. If I'm fast enough that it's trying to drag the inside front tire a bit it sometimes fully engages abs which is a louder pump sound like the video. Never seen it at low speed. Did it on both original factory brakes and new aftermarket pads.

 

Ah, I forgot you added a video. Yes, that sound at the end sounds like ABS kicking in.

Does the pulsation happen if you slowly apply the parking brake under the same conditions/situation? If not, it's not your drums that are at fault.

Moaning (and even pulsation) can be a sign of air in the brake lines also. Sputtering happens in that case. And air trapped in the brake lines happens a lot on 1st gens because people don't know about/don't bleed the LSPV (load sensing prop valve) that many of our trucks have mounted to the frame, driver's side, above the rear axle. If you have it, it typically has a bent-wire arm with rubber boot, and a round pulley looking wheel that attaches just on the back/passenger side of the diff pumpkin. Anyway, there's a bleeder on the LSPV, and that LSPV sits up higher than any other point on the truck after the cab, so its where air likes to go, and gunk can get trapped. If you ever opened the rear lines, or left a bleeder (on it or the wheel cylinders) cracked, you may have air in the lines causing it.

It's just weird, the timing. Unless you had a bleeder open out back when doing your work. I don't remember seeing you say that.

 

PS, what is that yellow flashing light in the dash I'm seeing? Seat belt? I always wear mine, so I dunno where it'd be flashing in the gauge cluster.