I'm Broken

Obviously not the brakes. Big question what is it?

Before someone says IWE it still does it when in 4H. That was the first thing I tried.

After driving/warming up for 5 minutes or so I get the typical "warped rotor" pulse with a pretty nasty grinding sound once it gets below 10mph during a stop. After my 4H test to eliminate the IWE I took it on the interstate late at night and bedded the pads till I got the brake fade then drove it without stopping for 15 minutes to let everything cool down. Still had the problem. Tonight I decided to try stopping in neutral and wouldn't you know the noise was gone. Tried the next stop in gear and grinding was back.

I always search before asking questions in case someone has already solved a similar problem but I really didn't see anything. Any thoughts?

KYBuckeye

I don’t have an answer but have a similar issue. However I’ve had the front left IWE replaced twice and the right one replaced once and I’m only at 60,000 miles. My grinding brakes are intermittent. Of course once it does it, I start up and try to stop again and they work fine. No idea what the issue is

I'm Broken

I'm only at 17,000 miles. 2017 5.0 BTW. Have you tried dropping into neutral when stopping?

emerilnut

What made you think to try it in neutral? That's a troubleshooting step I would NEVER think to try.

I'm Broken

Why not? If the grinding persists in neutral it's gotta be the brakes. If not it's somewhere in the drivetrain. Just a logical way to troubleshoot. Divide and eliminate.

KYBuckeye

Im going to try that once my brakes grind more regularly. I have t tried yet.

van462

Rear diff? With it in neutral the driveshaft wouldn't have as much load on the pinion. Maybe change the diff oil and check for metal flakes. Maybe find a steep grade and slowly climb it in forward and reverse to see if the grinding sound occurs just using drivetrain load.

I'm Broken

You know I took my truck in already complaining that I found an oil stain directly under my rear diff one time and one time only. It was enough to make a 12" or so stain on my driveway. Service guy said he checked it out and found nothing and levels were good. Said it possibly was overfilled and overflowed out. I'll try your suggestion. Thank you.