Originally Posted by GonneVille
Welcome! Good to see yet another person who enjoys the land-yachting lifestyle
Front brake shimmy is warped rotors, H- and C- bodies are notorious for this. GM really didn't put big enough brakes on these cars.. Make an investment in a good set of slotted rotors.
While you're plugging around in the wheel-well, make sure to check your sway-bar end-links.
No, its not the fact that these are undersize brakes, its the fact that the rear brakes are not adjusted properly. Most manufacturers design the rear brakes to do 30-40 percent of the braking, and when the rears do their job, the vehicle doesn't have to depend on the front to do 100 percent of the braking.
So, make sure the rear wheel cylinders are working, no air in the rear lines, make sure the shoes are in good shape, and the drums are good too. Make sure the automatic adjuster is lubed properly, and working. Adjust the rears, so when you spin the tire, it will stop before making 1 full revolution. Thats how the braking system works in pretty much all cars. Worn shoes, poor qulaity linings, or worn front rotors will also cause problems. My point, don't blame the manufacturers, its how they are maintained that matters.
Oh, BTW, Welcome!!