I replaced the outlets in my spare bedroom, I turned the breaker off before doing it, (the breaker controls both spare and master bedrooms), when I turned the breaker back on, the power in the master bedroom is not working.

You have more than likely broken the connection that feeds both rooms. I suggest that you check the jbox where the two rooms are being fed from and verify the connections.

One of the outlets in the spare bedroom is suppling power to master bedroom.

Check outlets in spare room for a loose or broken wire. If u wired new outlets to speedy push slots, move wires to the screw connection. The speedy slots have a tendency to snap wire if wire is nicked when stripping insulation.

The outlet causing problem is more then likely on a common wall with master bedrm.

Good luck

Chuck

You have more than likely broken the connection that feeds both rooms. I suggest that you check the jbox where the two rooms are being fed from and verify the connections.

I haven't had a chance to check the j box as of yet... I did however check for broken connections on all the outlets that I replaced,and all was fine. (I'm using the side connections.) I do have a question though... one of the outlets is controlled by the light switch. This particular outlet has a lot of wires running to it... (3).two come in from the top and one from the bottom. One of the wires has 4 wires to it,red,black,white,copper. The other two only have three... (no red).All three black wires are together with a wire nut,the three white connect to the outlet the three copper connect to the outlet,and the lone red wire connects to the opposite side of the outlet from the three white... I replaced the wires as they came off. Only, I'm using the side connections on the outlet.I'll check the j box today... but, I'm not sure what I'm looking for,or HOW to look for it... Thanks.

Either they are switching the whole outlet with the red, or this room is a red circuit and black circuit passes through this box.
When you solve your problem, you could go back to that receptacle, break the tab off the hot side, and connect a black wire, which will be connected to the 3 blacks existing.

Last night my daughter lose power to her room and after checking the breakers we lost power in the other bedroom which is at the other end of the mobile home. What could the problem be?

Did you reset the breakers?