Defective Flasher Relay.
hazards and turn signals have separate flashers. replace flasher for turn signals
you must have a blowed fuse.
You may have blown a fuse or a flasher.
Try replacing the hazard flasher. If that does not work, double-check to see that you have the proper bulbs and fuses installed for the brake lamp circuit.
Flasher relay bad. This is a separate flasher relay from the one controlling the hazard lights.
Two different switches. The combination switch on the column is most likely the culprit. This may be fuses. The turn signals and hazard lights are fed by separate circuits.
If lights light up but do not flash, then need to change the flasher, if no light at all chk all fuses first.
There is sometimes a separate flasher for the four way curcuit.
the hazard lights and turn signals are linked together. make sure your signal arm is entirely linked up to all of the wires it should be. make sure no wires fell down that you didn't notice when the turn signal switch was pulled. you can also check the hazard switch.
The only thing common to all those lights (but not to the center brake light) is the hazard switch. I'd check that next. On my 96 Century the hazards override the signals and brake lights meaning that the signals and brake lights must be wired into the hazard switch somehow.
The hazard switch itself is bad. The flasher module for the turn signal is built into it. Replace it yourself for 100 dollars(cost of part).
check your bulbs some bulbs have two filament on them one may be out and the other working.