i am having toruble with my mustang?

[Roy]

ok so all of a sudden my speakers are not working only subs and twitters the high beam are not working only low beam and the rear brakes are not working only front what that might be i check the fuse they are good oh i didnt check the main fuses the real big one but can all this be from one problem all this happen within 2 days or atleast when i notice can some one help its a 02 mustang v6 automatic ,thankyou

[cobrajet]

The brakes have nothing to do with any of the rest of your problems. They don't depend on anything electric to work for safety reasons. If they don't work it is either a leak in the rear hydraulic system, a mechanical failure/worn out parts inside the drums, the proportioning valve is no good, or the master cylinder is no good. If the brake light is on you should take it to a mechanic IMMEDIATELY. No rear brakes will get you into an accident very easily. Applying the brakes when going around a turn or in wet conditions will make the vehicle spin out.
The sound system problem can be a burnt out amplifier in the radio or an external amp, a blown out channel inside the radio, a blown fuse, a bad connection somewhere, or blown speakers.
The high beams not working are either because you have a bad headlight switch or because both bulbs have the high beam filaments burnt out.