No brake lights, no dash lights, push brake pedal and headlights dim greatly

of course changing a brake pedal switch will not help in a reversing light problem
they are two totally different circuits
check for a damaged wire at the reverse light switch or bulb holder for the reversing bulbs for a dead short
as for the rest check the IGN fuse under the bonnet

fuses blow because of dead shorts or excess current draw
to blow a 15 amp fuse indicates a dead short
by disconnecting the rear lights , the problem is in something else you have replaced
could be a problem in the head light wiring

lamp failure light on possible because the SECOND filament in your STOP/TAIL Light Bulb is burned out- change one side and check fail lamp again- repeat on other side- fail lamp works off of resistance-burned or blown bulb is only way it lights unless you have a wiring issue

you have blown the side light fuse when the headlight smashed ,somewhere the wires are bamaged or the side light bulb has broke and the filament feed wires have touched causing the fuse to blow ,also look under the bonnet next to battery their is a power distribution box next to batter ,check uses in here as well ,they are not markewt though so look for a red 10 amp or a blue 15 amp fuse

sounds like a fuse,but it could be blown bulbs, check them first they will be blackened a little or the element will be burned off or disconnected. the fuse panel should either be on one of the sides of the dash when you open the door, underneth the dash on the drivers side or under the hood in the engine compartment.It should be labeled brake light or brake lamp, if you cant find it, just check them all and replace any that are blown with the same amp rating (number on the top of fuse)

check u brake light switch under dash follow brake pedal up towards steering column switch is mounted there check to make sure in correct position sometimes pop out if ok test switch for power if power to switch test push on pedal no light replace switch

If your fuses and bulbs are all good, then look above your brake pedal and you will see your brake switch up along your brake pedal arm. It will either be between the brake arm and the firewall so when you brake it pushes the switch in. Or it will be between the dash and the brake arm so when you brake it pulls the switch out. Most likely this switch needs to be replaced

disconnect head lights, and replace fuse. Then turn the light back on to see if it blow a fuse again. if not, plug on light in at a time. You might have a bad headlight???? then unplug that one if nothing happens. Then plug the other one in. It could also be a bad taillight bulb. I have had bad tail light bulbs. Do all of them, one at a time.

check each of the terminals of those bulb you mentioned. wonder if there's a relay associated to this circuit, check for short if this is the case. remove all the light bulbs [of course - the dash may not be necessary (it's a PITA) & let's hope that it's not the culprit]. visually inspect those bulbs & replace if something unusual. put back the relay if it has no short, turn on the switch, let's hope the dash lights up & it won't blow the fuse anymore, otherwise look for uninsulated wire touching the chasssis or ay metal part of the car. you may continue replacin the bulbs.

iF YOU ALREADY CHANGED THE BULBS THE PROBLEM IS PROBABLE A BRAKE SENSOR SWITCH UNDER THE DASH LOCATED ON THE BACKSIDE OF THE BRAKE PEDAL LEVER IF THIS DOES NOT THEN CHECK YOUR FUSE BOXES