I bought a 2005 CC Z71 that came complete with a brake-induced vibration or shimmy. The truck just rolled 50k miles yesterday. When driving at a moderate to high speed and applying the brakes, I get a vibration. It felt just like warped rotors. I pulled the wheels yesterday and put a dial indicator on both rotors. They're not warped. With the front brakes seemingly being okay, I started poking around the front suspension and steering. I found some play but I'm hesitant to say it's the source of my problem. With the front wheels off the ground, I put one hand around the pitman arm at the steering box and with the other hand, moved the tires left and right. I could feel a small pop or clunk at the steering box/pitman arm when changing directions. It could be the pitman arm, but it almost feels like the slack is in the box. Either way, the truck is stock with only 50k miles on it. I'm having a hard time understanding the premature wear. Anyone else have a similar problem? What was the solution?

 

Check your rear brakes. I swore it was my fronts, but when I found the condition of the rears and had them turned, the problem went away for awhile. It came back because the rears were junk.

 

Did you put the lug nuts on the rotors to hold them flat against the hub when you checked the runout?

 

Rear brakes have been a problem from what I understand( discs) As for the pop your feeling mine does it also, but just in the left front wheel, doesn't affect my drive at all, not a vibration untill the brakes are heated, then I get a shimmy also.. I know my discs in the rear are messed up, can feel it really bad when slowing down after blasting down the 1/4 and getting on the brakes.. I say check the rears if you have discs

 

I did not put a lug nut on the rotor but it had a Torx screw holding it on. I tugged on it and it did not budge.

I'll check out the rears just to be sure. My rear brakes are drums, though.

 

brake shake in the wheel is the front and in the pedal is the rear
disc or drum

 

Id say turn the rotors...

 

My bad rears made the steering wheel wiggle.

 

05 should have rear drums. if the runout on the front rotors is within specs or less than .003 runout i would have the rear drums turned.