the ebrake light is related to when the handbrake is up past a certain position.

check the reverse lights with a multimeter.
if they are still good then check the fuse box under the dash on the drivers side, and the fuses in the engine bay, look for the one for the reverse lights.
DID the lights both die at the same time? if so probably a fuse.

if u only just bought the car and u dont know tell us.