Grinding noise

[tonyrb]

I’ve had an intermittent grinding noise for some time. It can be produced when in drive or reverse, 2 wheel or in 4 by, but not in park. There’s two scenarios involved. One is from a stop. When the brakes are released to roll forward, if I moderately tap the accelerator it gives an awful grinding feedback from under the truck. Same thing if backing up and accelerator is tapped. I’ve also noticed it can be coupled with a buzzing sound that shows up intermittently from a stop or when I come to a stop. 

Second scenario happens while at various speeds. If the accelerator is used to gain speed, the grinding sound will commence until I ease off the pedal. It can happen if I drop a gear, stay in the same gear or also between an up shift from one gear to the next.  All speeds from 30km/h to 130km/h. 

Sound familiar to anyone? 

 

 

[1SLOW1500]

Stock height truck or modified? First thought if nothing is changed and this just started out of nowhere is brakes. On modes trucks insay drive shafts. Higher miles or 8 speed I would add trans to list of things to look at. But a shop can put it on the lift and go under. 

I have seen everything from stuck brake pads to debris in them (rock). To drive shaft rub. To lose linkage to bad stall. 

[Hillwood]

Check the transmission/transfer case mount for something like a rock stuck in it grounding the mount to the frame. 

[CCGMC]

I just had an unknown grinding issue on my 2012 escalade that sounded terrible and I thought I was doomed with a major driveline issue. With some investigation I discovered that the parking brake shoe on the driver side rear had detached and was being ground up inside the rotor hat. Not the metal ring just the brake lining had detached. This was at 180k miles though. 

 

$20 for new parking break shoes at Autozone. Can you say “awesome”?!!!