Lateral axle movement issues

[rsk68]

So this all started with the issues I was having with my Brakes as discussed in an earlier thread (no link)

Most notably in canyon driving I need to pump the brakes once to get good pedal feel, I originaly thought it was air in the line and have bled the brakes every way known to man, I now believe it is due to the rear axles pushing the pistons in a bit and forcing fluid back into the master cylinder, this weekend I will jack it up and measure the lateral movment with a dial indicator.

I was told by the Wilwood tech that no residual valve would cure this problem!

So some questions that you guys may be able to help me with, what would be the least movment you could get with a C clip? do i need to go to a C clip eliminator? could my C clips be worn thin? the Wilwood tech recomended a Torsen Diff due to very little lateral movement, anyone familiar with this diff?

Thanks