Vibrating/tires rumbling when making turns at low speed

[apollo18]

Hey guys! I got a 2007 escalade ext. it's an AWD. This problem seems like it just started after it snowed. The truck never did this on any other days, and I feel like I notice it more after I hit a curb with my front passenger tire. So it snowed here in Alberta and I noticed when I'm at low speeds or in a parking lot, and I try turning the truck rumbles/vibrates. It feels like traction is kicking in/the tires are bouncing. This only happens when I am at low speed and taking a sharp turn. I never noticed this before, it feels like it's extra now.

I hit a curb with my tire a couple days ago and it caused a flat tire. I got that all fixed. Do you guys think it's an alignment issue? Or something else? I personally think it got worse after I hit the curb because I don't really remember feeling it before the curb hit.

The truck drives perfectly fine on city roads and highways. This rumble only happens at low speed/parking lots. Like yesterday I was turning into my culdesac and it rumbled and there was only packed down snow on the ground. Also when I was trying to reverse park, the rumble/bounce thing happened again. Hopefully my explanation makes sense.. it feels like the tires are bouncing kinda thing

[Jsdirt]

What you're feeling is the ABS activating when it shouldn't be. Usually this happens due to rust forming underneath the wheel sensor in the hub bearing - it will shove the sensor upward, increasing the clearance to the tone wheel.

 

If you could see the sine wave generated by the sensor as the wheel spins, it gets taller (and also skinnier width wise, as more pulses per a given unit of time are happening - picture an accordion squeezing together) as speed increases. It also gets shorter as the clearance increases. Eventually it gets to a point where the computer cannot read the signal at low speeds, since the sine wave isn't large enough to tell the vehicle the wheel is turning. Since it's (presumably) receiving signals from the other 3 wheels, the ABS is activated - it thinks that wheel has locked up.

[apollo18]

Thanks for the reply do you know why it only does this when turning on snow/packed snow. 

 

If if I try turning on normal clean road it's perfectly fine 

[Jsdirt]

It could be just the tire tread - hard to say over the net.

 

If it is indeed ABS activation, it's probably because a tire is turning just a bit slower than the rest ... and with a skewed sensor reading, it falls below the computer's threshold for activation.