Hi Jack:
I have a 73 Pantera with Wilwood six piston fronts and four piston rears. Twin master cylinders with in-cockpit adjustment, floating front rotors, stainless steel brake lines, performance friction #93 pads, new steering rack, new upper and lower ball joints, urathane bushings with specially fabricated inserts and bolts that have .001 clearance, new spindles and bearings, Hall's aluminum hubs, suspension bolts that have been custom fabricated so that the full bolt shank extends through both sides of the attachment points, new sphere bars on the lower A-arms and new urathane bushings at the sway bar to frame attachment points. We even had a bushing fabricated to fit between the front bearing inner races so as to preclude any potential bearing movement.
After all of this, which has been progessive, we still have a violent steering wheel shake under heavy braking. It is extreme from 160mph down to 120mph but can also be felt quite well from 80mph to 60mph. The only time it is reduced is when the brake bias is turned full to the rear.
Any help you (or anyone else) could lend would be greatly appreciated
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