Mystery Wobble (NEED HELP)

[nathan1larson]

Ok, this is a real head scratcher for me.

 

When it rains, my truck will start to lurch to the left. Almost like a horribly warped rotor or as though 1 brake calliper is pulsing on and off. It will aggressively jerk my wheel to the left and make a sound that seems to be related to my wheel rotation (like a rotor). But not on the highway, only when I brake (it happens more as I brake more, like as though it's caused by heat). But it's not heat related, since I've tried to get it to do it when it isn't raining, and it won't do it. Works perfectly fine in dry conditions

I just rebuilt both callipers, checked my pins, re lubed them, put in new brake fluid, etc. so there's no way it could be a sticky pin or a piston that won't release.

I thought maybe it was an ABS issue that wasn't tripping an ABS light so I pulled my ABS fuses. Still did it. 

 

Any help would be greatly appreciated.

 

 

Truck is a 2008 Sierra SLT 4x4.

[15SilvyHC]

Have you checked the wheel hub bearing assemblys for play? Common issue on these trucks my first guess would be one of yours has gone bad.

[Joseph Billeter]

Man I work in an automotive shop and I’ve had them check everything 3 times! I even thought I had a bent rim so I replaced all my wheels and tires too, still nothing. They’ve tested literally everything and all they can diagnose is slight play in my u joint... so basically I’m going to wait until my rear end blows up and hope somehow what I’m feeling in the front is coming from the back.... good luck man. 

[sefiroxx]

Had similar symptoms with a bad front hub/bearing assembly. It was really scary in the rain with lots of steering slip/slop.