i have a 69 fastback and both brake lights just went out and i replaced both bulbs.ive checked the buss fuses that i seen under the dash.i cant read which one would be for the brakes though.please help

 

Just pull one at a time and see if any are blown. You may also have a brake light switch that has gone south. I am not familiar with the location of the brake light switch on your fastback, but it is most likely operated by the brake pedal assembly. If none of your fuses are blown, then see if you can locate that switch.

 

ok ill give that a look.thanks for the respond.i forgot to mention that i replaced the master cylinder and i dont know if that has anything to do with it.i really dont know what the brake light switch looks like.thanks for everything

 

Did the brakes work right after you replaced the master cylinder? Some of the newer models from my 65 had the brake light switch at the master cylinder.
It will look like this.

Here is some more info I dug up for you.

No brake lights:

For the brake lights to work, you must have power on three wires at the sequential flasher connectors in the trunk:

Green-Orange (LH Inner light)

Orange-Blue (RH Inner light)

Green (Brake signal from brake light switch under the dash)
If there is no power on the Green wire, check the brake light switch under the dash attached to the brake pedal.

If there is no power on the Green-Orange or Orange-Blue wire, check the turn signal switch connector under the dash. Make sure all the pins are seated into the connector shells and the both connector are fully seated together. If the connector is ok, the turn signal switch is probably bad.

No brake lights on Right or Left side:

Check the turn signal switch connector under the dash - see previous section for details. The turn signal switch is most likely bad.

CENTER POSITION
LEFT TURN
RIGHT TURN

Green, Orange-Blue Blue, Green-White Blue, Orange-Blue
Green, Green-Orange Blue, Green-Orange Blue, White-Blue
Blue, Red Blue, Red Blue, Red
Green, Orange-Blue Green, Green-Orange

 

ok yeah that thing.i tke it that its suppose to be hooked up to the brake pedal.lol.right now its just hanging near the pedal.lol.i didnt know how to put that on or if it had anything to do with the brakes period.i really didnt check to see if they worked after i replaced the master cylinder.thanks for your help.i really need to get these lights back on