I just finished my SAS. I used IFS hubs, re-drilled fj-60 rotors to mount the same as stock IFS rotors would with the 6 bolts, and used IFS calipers mounted on the outside of the ears. There are a few write-ups on this. I have an up and down vibration in the steering wheel on hard braking at highway speeds. I don't feel it under light braking, or at lower speeds. Everything seems tight, and they are new rotors. Any thoughts? I don't get any side to side shimmy at all. I have 4" Marlin springs with the bottom two leaves taken out, Marlin Hi-Steer, and the same rims and tires I had before the SAS. I reused my (now modified) calipers and pads. It stops fine,, and on a straight flat road stops very straight. I feel the vibration more in the wheel than I do in the pedal.
Anyone experience this as a result of anything just inherently related to the SAS, or do I need to do a better job of re-drilling fj-60 rotors? The bolts are torqued properly, but I know that the holes are not as perfect as they should be, but stock IFS rotors have play in the bolt holes, and since they center with the hub, I don't think that the drilling could really be causing this. The pads are making contact across the whole surface of the rotor, you can tell by the wear pattern.
Well, if anyone has a thought, please let me know, it would be much appreciated......

 

just because the rotors are new doesnt mean they're not messed up.... if it just shakes when braking then the rotors are probably warped

 

hmm, was thinking the same thing myself. I plan on ordering new ones when i save a few dollars, and drilling them on a real drill press at a shop instead of the booty-fab setup in my garage. I feel like it would be a similar situation if the rotor wasn't seated all the way onto the hub...again, new rotor, drill better, re-do, same solution.

 

why not buy them pre drilled, or for that matter, why get drilled at all. if you hadn't drilled them already, you could save tons of money and just have them turned.

 

also, if you are using penetrating fluid or oil while drilling, it can pit the rotors in no time. and it sounds like since its only at high speeds while braking then its only a slight warp.

 

i did not drill braking surface, i drilled the mounting 6 bolt hole pattern because they are fj60 rotors and ifs hubs.they aren't pitted, but i agree, probably slightly warped because only at highway speeds