I just reread your original post and saw that you dropped the steering column...
the wiring to the MFS has a connector on the side of the column, it's possible that it got jarred loose.
Do you know if the old switch was defective?
I suggest using your test light and follow the current flow from the brake light switch through the connector at the column to see where the circuit loses power.
From your previous remarks that your rear hazards work I would suspect that the wire from the brake switch to the "P" at the connector is having problems, either at the connector or internally at the MFS.
The wiring for the brake lights and hazards are the same leaving the MFS to the rear lights so if the rear hazards work properly I would suspect the wire from the brake switch to the "P" terminal is the source of the problem.
The brake light switch and hazard power both connect at the MFS, I'm just not certain how.
I had written a long step by step trouble shooting post with the highlighted points on the diagram, but think this would be your best place to start.
Perform the testing with the turn signal lever in the neutral position, brakes depressed and hazards off.
Also, if you get voltage at "P" but the brake lights still don't work, remove the hazard flasher and engage the hazard switch while the brake is still depressed.
Check for voltage at "K". If you don't get voltage there the connection internally at the MFS is open.
If the brake lights still don't work you can run a temporary jumper from a known hot to "M" and "N" individually to check the brake light functions on the back.
Sorry if this is confusing, I suck at typing as well as explaining the rationale of the steps.