I would say it's the rotors, I would scrap those front rotors, check the rears, replace if needed. Also check all of the calipers for a sticking piston, replace any calipers that are defective. Then the best way to prevent warped rotors is to replace the wheels and TORQUE them on with a torque wrench to spec (75 ft/lb). When wheels are put on with a impact wrench, theres a very good chance that they will warp. Instead of arguing with mechanics, whenever my car is in the shop and the wheels were taken off, I bring my torque wrench, drive about a block away, slightly loosen all the lugs and retorque the wheels. You will be amazed at how random the torque will be after the wheels are installed with an impact. With over tightening and oneven pressure the rotors don't heat evenly get hot spots and warp.

GOOD LUCK,
--
Bruce S. near D.C.

You can check for excessive play in the rack's inner joints by jacking the front end and pushing/pulling on tire at 3 and 6 o'clock positions.

Just one dumb question: I assume you replaced rear rotors too? I was convinced front rotors on my 940 were culprit because vibes came via steering wheel. Since front rotors were fairly new, I did rears first and this solved problem.

Other posts are on-target. The fact that you can feel it through the floor tends to point away from the rotors.

One other thought - when you were working on the brakes, was there any indication that one of the caliper pistons might be moving less freely than the others? If one piston drags hard on the rotor, it will heat the rotor and then put pressure on it as it cools after you stop. This will warp the rotor almost immediately.

See if one rotor is warmer than the others after you stop the car. Careful not to burn your finger.

I would guess it is the inner joint on the tie rods (you need new rods) that is causing it. That is easy to detect with wiggle. It might be what the other poster referred to a a "bad rack" since new rods come with a rack. But you do not have to replace the rack to fix it if it is the inner joint.

Don't want to bring this up as it is an expensive repair but...

It sounds like it COULD be your rack. When my rack went a couple of years ago, at first I thought the rotors were bad. Had the same type of symptoms you are experiencing. Had a mechanic look at it and he said the rack was worn internally, had too much play in it which was causing a lot of movement. The pulsating went away after the rack was replaced...

BTW - how many miles? often 240 racks seem to go between 150-200K. Mine went at around 180-185K.

Hopefully I am wrong. Good luck!

Jim 90 244DL 211K