On my 89 Bonnie,when I put on the brakes,the car and the steering wheel shimmeys awful.I took all the wheels off and can not find anything visibly wrong..Some days it is worse.I`m thinking it must be the anti lock system.The pads are about half worn out.I thought I would put on new pads and rotors.Any suggestions?,,Thanks

normally thats rotors, abs makes a noticeable noise when the motor activates

The only way to check rotors is with a run out dial indicator. (+ know min thickness)
With the good pricing of new rotors, I never turn or lathe them ever, not worth it, unless they are performance or expensive rotors.
Are both sides of the pads worn evenly?

Your rotors are warped.

There is no noise.So, must be the rotors.I will go buy new rotors and pads.The vibration is from the front..Thank you all for the help.

Yes...They look ok.