Again, thanks CVI!

jfarsang wrote:If you are experiencing pulsating, vibrating brakes and/or vibrations while driving, a good place to start are the brake caliper sliding pins.
Even if it feels like your tires may be out of balance or the rotors are warped, the sliding pins may just be the culprits.
By design, they will rust and sieze up. It's just the way they are.
So pull them out and check them one by one.
Ideally, you want them to be very smooth with no ridges or rust.
Usually when replacing the brake calipers, if they are a full or partial kit, they should come with the mounting brackets to the spindle and new sliding pins (bolts).
This applies to both L300 front brakes and L400 front/rear brakes.