front end shake

[98s14inaz]

I know some of the other s14 guys know what I am talking about. Anything over 75mph and braking front end shakes like hell. During braking it comes and goes so I don't think it is the rotors. i have had the wheels and tires rebalanced three times and rotated back the front ones. I didn't install my suspension yet because of this problem. it is kinda unsettling. My car is a 98 se with no abs and 41k on it. Mabey the shocks are shot??? I was going to replace them anyway. Any thoughts from the experts? I had a thought the other day that mabey my header was heating something up thus causing the shaking.

[Dousan_PG]

few things when shaking

flat spotted tires
unbalanced tires (you already checked this)
warped rotors (still possible)
bad bushings (tc rods specifically or LCA is another possibility)
bad alignment.

[98s14inaz]

already did urethane t/c bushings. sorry forgot to mention that. Alignment shop said alignment was with in specs too. Pardon my ignorance but what is LCA? I don't think it is the tires, I have never really locked them up and this problem has been within the last few months. It comes and goes especially on different raod surfaces. Brake pedal never shakes but steering wheel shakes like hell, enough to make my watch rattle. Any other ideas from the experts?

[Dousan_PG]

lca
lower control arm

[ny_jee]

Check also, tie rods or the ends, retorquing of lug nuts.