intermittant brake shudder
 

hi folks,

my recently purchased 98 626 with 164k miles shudders when I hit the brakes.

I thought I had warped rotors but I see that the shuddering is intermittant.

It does not happen every time I hit the brakes. it only shudders 2 out of 3 times or so.

the other times it stops smoothly.

what can be up with it?