Brake cylinder solutions
Some master cyls have the front chamber for front brakes and the rear chamber for rear brakes. That way if you have a line leak, you still have "some" brakes left to get you home...
The brakes that are cold are not working to stop, or you would feel some heat. On the front of the car replace both wheel cylinders/calipers for equal braking, and bleed the air out.....it will show a big difference.
Then do the same for the back brakes.
If you need some help, get back with me. -Bob