'12 Cascadia Shimmy/shake while braking

This is starting to get frustrating. Anything over 10lbs application pressure produces a steady rythmic shaking of the front end including the steering wheel.
Replaced:
On the Steer axle:
Both Brakes drum and brake shoes
Both Hub assemblies
Both S-Cam arms and bushings
On Drive axles:
Both rear axle drums and brake shoes(drums had a lip)

When the S-Cam arms and bushings were replaced the frequency of the shaking became higher and the magnitude less, but not by much.

I've disconnected both front brake actuators and the problem ceased.

It rolls normally under power and coasting.

Thanks for looking.

 

I asked the shop in Amarillo to do a dial run-out on the drums, but I don't control the MX on this truck yet and they replaced the S-Cams and bushings. I don't have the reciepts for the drums, is there anyway to tell their origin by looking at them?

Overall I'm really disappointed by the level of incompetence at all the dealers I have been to so far.

Thanks

 

Can't tell you. the left hub brake shoes and both drums were new when I got it a month ago. It looks like they've been swinging the shotgun around on this one for a while.

 

That's the problem, they don't give a #### what I think. And being a shop, I guess there's more money in doing stuff without actually fixing the problem.